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Strategies comparison in response to the two waves of COVID-19 in the United States and India
International Journal for Equity in Health volume 21, Article number: 57 (2022)
This study aimed to compare the prevention and control strategies adopted by the United States and India in the COVID-19 outbreak and analyze the effectiveness of their strategies, in order to provide empirical experience for the prevention and control of the epidemic.
This study extracted official data on COVID-19 from various official websites, summarized the policies in place in the United States and India, and evaluated the effectiveness of their policies.
The United States has adopted a series of mitigation strategies to control the two waves of epidemic, including strengthening virus detection, calling on the people to wear masks and so on. As of May 30, 2021, although the daily new cases there decreased to some extent, the effect was not ideal. The US’s daily new cases ranked fourth and the cumulative number of confirmed cases ranked first in the world. India has adopted containment strategies in the initial stage of the outbreak, making the epidemic relatively stable. In the later stage, India has turned to adopt mitigation strategies. In addition, many factors including the lack of medical resources and premature relaxation measures led to the rapid deterioration of the epidemic situation. As of May 30, 2021, although the daily new cases in India has a downward trend, it ranked first in the world, and the cumulative number of confirmed cases ranked second.
There are differences between the epidemic prevention strategies adopted by the United States and India, especially India’s containment strategies which helped it better control the epidemic in the early stage. However, the epidemic in the two countries is still severe. With the advent of virus mutants and the absence of immune barriers, it is meaningful that the two countries continue to take non-pharmacotherapy intervention measures and accelerate vaccination, according to specific national conditions adopt containment strategies that can control the epidemic more quickly when necessary, and pay attention to the risk of epidemic rebound caused by premature relaxation of epidemic prevention policies.
In December 2019, an outbreak of a novel coronavirus SARS-CoV-2 was first reported in Wuhan, China . On 11 March 2020, WHO Director-General declared that the COVID-19 outbreak has the characteristics of a global pandemic . COVID-19 is the third major coronavirus outbreak after SARS-CoV and MERS-CoV, and has killed more people than any previous outbreak . As of May 30, 2021, the cumulative number of confirmed COVID-19 cases worldwide has exceeded 170 million and the cumulative death toll has exceeded 3.54 million .
In response to COVID-19, governments around the world according to their actual situations adopted various interventions, such as calling for wearing masks, canceling or postponing large gatherings, increasing physical distance between patients infected with COVID-19 and uninfected people, conducting online teaching, and strengthening the screening, tracking and isolation of suspected and confirmed cases. In addition, in many countries, areas with serious epidemic situations have been blocked, entry control has been strict, round-trip flights with severely affected countries have been cut off, entry personnel have been strictly screened, and forced isolation has been carried out as required . In terms of COVID-19 vaccines, many vaccines have been put into use, such as China's Sinovac COVID-19 vaccine, Sinopharm COVID-19 vaccine, Pfizer vaccine, AstraZeneca vaccine, etc . Although more and more people are vaccinated globally, it is not advisable to rely on vaccines alone to fight the outbreak. Seychelles, as one of the countries with the largest number of vaccinations in the world, has doubled the number of confirmed cases by early May after lifting the restrictions on most tourists from March 25, 2021 . Michael Z. Lin, associate professor of neurobiology and bioengineering at Stanford University, warned that what countries need to do was not only vaccination but also adequate border control, extensive testing, and the setting of hospitals capable of responding to the epidemic . The study of Giulia Giordano et al. also shows that non-pharmacotherapy interventions have a greater impact on the evolution of the epidemic than vaccination alone . In addition, in the face of the complex situation of virus mutation, the effect of vaccine may be affected to some extent. The official data released by the US CDC showed that the mRNA vaccine used in the United States was difficult to prevent the infection and transmission of Delta variant, although it has good efficacy in clinical trials . It can be seen that non-pharmaceutical interventions still play a very important role in epidemic prevention and control at the present time when vaccination is accelerated.
At present, the top two countries in the world with the cumulative number of confirmed cases are the United States and India and the cumulative death toll of the United States ranks first and India ranks third in the world, which have attracted the world's attention. It is also very important for them to take appropriate non-pharmaceutical interventions. In addition, India began to implement the vaccination plan on January 16, 2021, but as of May 1, only nearly 10% of Indians have received one dose of vaccine and about 2% have completed two doses of vaccine . The proportion of vaccination was very low. At the same time, the vaccination rate in the United States is far lower than the 70% needed to achieve herd immunity . Therefore, it seems more necessary to take reasonable non-pharmaceutical intervention measures to alleviate the epidemic. Based on the background of the global COVID-19 epidemic, combined with the non-pharmaceutical intervention measures adopted by the United States and India and relevant official data, this article analyzed the implementation effects of the measures and brought some enlightenment for limiting the epidemic in the two countries and even the world.
Material and methods
This study focused on the comparative analysis of non-pharmacotherapy interventions for COVID-19 in the United States and India from January 20, 2020 to May 30, 2021. These two countries have mainly experienced two waves of outbreaks, and the second outbreaks, when the number of confirmed cases and deaths increased rapidly, were more serious than the first wave. We assessed the effectiveness of the epidemic prevention measures taken by the two countries in combination with the epidemic situation.
Data and sources
All epidemiological data, including cumulative confirmed cases, daily new cases, cumulative deaths and daily new deaths, were from the public data of the World Health Organization . With regard to policy information concerning COVID-19, we searched national documents and responses to COVID-19 through government websites, such as the government decrees issued by the official website of the United States government (USAGov) and the official website of the India government (MyGov) since the outbreak of the epidemic. According to the collected epidemiological data and policy information from January 20, 2020 to May 30, 2021, we drew figures by Microsoft Excel for quantitative analysis.
Main measures taken by the two countries in response to COVID-19
The United States
On January 20, 2020, the first confirmed case of COVID-19 appeared in the United States . At the beginning of the epidemic, in the US, the government, the media, and the public were not aware of the COVID-19 epidemic, and the United States Centers for Disease Control and Prevention (CDC) advised the public to take daily precautions, but did not recommend that healthy people wear masks. With the increase of confirmed cases, the US government prepared to take isolation and curfew measures in "hot spots" on March 16. In late March, most US states and territories issued stay-at-home orders, stopped non-essential businesses and closed most schools. However, the states gradually reopened businesses and restaurants in late April and resumed work and production in May. While the epidemic did not completely slow down, the states’ epidemic prevention measures were relaxed. The number of daily new cases in the United States increased rapidly in late June and reached the peak of the epidemic on July 18 . Subsequently, the United States took measures such as increasing investment in virus testing and advocating social distancing to alleviate the epidemic, but large-scale campaign rallies brought about by the presidential race, low public awareness of epidemic prevention, uneven epidemic prevention measures in various states, and the emergence of new coronavirus variants made the epidemic in the United States more severe. At the beginning of January 2021, the United States reached a new peak of more than 310,000 new cases per day . The government has strengthened the implementation of epidemic prevention measures, such as strictly requiring individuals to wear masks in the transportation network, and strictly restricting restaurants, shops and other public places in the states. Since then, the number of daily new cases has decreased significantly, but the cumulative confirmed cases in the United States have been still the first in the world. Table 1 shows the main epidemic prevention and control policies adopted by the United States.
On January 30, 2020, India confirmed its first case of COVID-19 infection . India implemented a nationwide blockade policy on March 25, 2020 . As the epidemic situation became more severe, India entered the first period of rapid deterioration of the epidemic in early July and reached a peak in September. To reduce the speed of the epidemic, the Indian government has adopted measures such as implementing border prevention and control measures, managing different regions according to the severity of the epidemic, strictly controlling the export of epidemic prevention medical resources, strengthening case tracking, phased blockades, etc. The epidemic situation has slowed down and restrictions have been lifted in stages. It is worth noting that the contact tracing strategy adopted by the United States is limited—not done for all cases, in contrast, India adopted a comprehensive contact tracing strategy in late September, which has played a positive role in its epidemic control . However, the epidemic rebounded due to lax epidemic prevention measures, the mutation of the novel coronavirus, the dilution of public awareness of epidemic prevention and so on, which was similar to the situation in the United States . In April 2021, the daily new cases increased rapidly, and the epidemic in India reached a new peak in early May . Later, according to the actual situation, several states imposed curfews and restricted the opening of public places. Table 2 shows the main epidemic prevention and control policies adopted by India.
The effect of the epidemic prevention measures taken by the two countries
According to the trend of the epidemic curve in the United States and India, the two countries have roughly experienced two epidemic stages, that is, the epidemic in the United States can be divided into two stages on September 9, 2020, and the epidemic in India can be divided into two stages on February 2, 2021. However, there are differences in the epidemic curves of the two countries. The two epidemic peaks of India are clearly demarcated, and there is an effective decline in the epidemic situation between the two peaks . But the boundary between the two peaks of the epidemic in the United States is blurred. Moreover, it can be clearly seen from the figure that in the first wave of the epidemic in the United States, the epidemic curve fluctuated repeatedly and the curve fell incompletely.
The United States
In the initial period of the outbreak in the United States, the United States mainly banned non-US citizens from or recently in China. Internally, the CDC advised the public to take daily precautions which did not include requiring healthy people to wear masks. And the US government believed that the COVID-19 virus was similar to ordinary flu, which to a certain extent misled people about the epidemic. The awareness of epidemic prevention of the US government departments and the American public was not high . In March 2020, the epidemic situation in the United States showed a severe trend. On March 13, the country declared a state of emergency . On March 27, the United States surpassed the data released by China and Italy and became the country with the worst epidemic . The FDA gave emergency approval to a virus test kit made by Swiss pharmaceutical company Roche to improve the efficiency of case detection. As testing has increased, the severity of the outbreak has also increased, although the United States surpassed 10 total COVID-19 tests per 1,000 people in early April, surpassing South Korea, where the outbreak was better controlled at that time [10, 18]. The states entered a state of emergency, issued home orders, and restricted the opening of public places. And then the epidemic was alleviated to a certain extent. But soon after, states’ loosened control measures, the spread of a mutant strain, large-scale presidential campaign rallies, and inadequate public awareness of the SARS-CoV-2 worsened the epidemic in the United States, with the daily number of new confirmed cases rising rapidly and peaking on January 10, 2021. Many states entered a new round of restrictions and the "mask order" was more strictly enforced. The outbreak was rapidly alleviated in February. Subsequently, the states’ epidemic prevention measures were gradually relaxed, and fully vaccinated Americans no longer need to wear masks indoors and maintain social distance in most cases. Although the epidemic has eased to some extent, by May 30, 2021, the United States had more than 32.91 million cumulative confirmed cases and more than 580,000 cumulative deaths, both ranking first in the world. Figure 1 is the COVID-19 epidemic curve of the United States.
India's focus in the initial phase of the outbreak was mainly on border control, such as the January 25, 2020 travel warning which asked the public to avoid non-essential travel to China. After the first confirmed case of COVID-19 appeared, India strictly controlled epidemic prevention materials and quarantined close contacts in the community. The number of confirmed cases of COVID-19 has stabilized at a low level. In early March, India mainly dealt with imported cases from Europe, the Middle East, Japan, South Korea and other countries, and local cross-infections gradually appeared. Particularly, the tour groups from Italy caused a sudden increase in the number of COVID-19 cases in India . In the face of the epidemic, the Indian government closed the border, and Prime Minister Modi advocated the implementation of a "Janta" curfew which prepared for the complete blockade for the next 21 days. On March 25th, curfew measures were adopted, relevant public places were closed, and the three colors were used to divide states and regions to implement different management strategies. The epidemic situation has changed slowly. In June, India began lifting restrictions in stages, with the resumption of work and production taking place gradually, at the same time, the daily new cases increased rapidly. After the fourth phase of the lifting, the severity of the epidemic in India peaked, and then gradually eased. At the end of March 2021, the situation of the epidemic in India deteriorated sharply, coupled with the lack of medical resources, the epidemic in India reached a peak on May 6, with the number of confirmed cases exceeding five times the first peak of the outbreak [12, 14]. As a result, the government restricted the export of vaccines and imposed a new round of lockdown and curfews measures in several states. The daily new cases have shown a downward trend, but the daily new deaths have not shown a significant downward trend. India's epidemic situation remained critical, with more than 27.89 million cumulative confirmed cases and more than 320,000 cumulative deaths as of 30 May 2021. Figure 2 is the COVID-19 epidemic curve of India.
While many vaccines have been developed and successfully put into use now, non-pharmaceutical interventions are also important, and the combination of the two can accelerate the success of the global fight against COVID-19. In the COVID-19 pandemic, countries have adopted different interventions at different stages according to their specific national conditions, with different implementation effects. This study described the intervention strategies and specific measures, which were adopted in the United States and India in response to the COVID-19 outbreak, and evaluated the effectiveness of the policies based on the daily number of new cases and deaths in each country.
In terms of the policies adopted by the United States and India in this epidemic, the United States has adopted a mitigation strategy. Its prevention and control goals were to control the spread, delay the epidemic speed, and reduce the overall harm. The focus of the implementation was on the treatment of severely ill patients , reflecting the characteristic of "treatment over prevention". India has adopted a combination of containment and mitigation. Unlike mitigation, containment aims to completely stop the spread of the virus, preferring more aggressive closed management measures.
The similarities between the two countries in fighting the epidemic
Adopting mitigation strategies
The United States has generally adopted a mitigation strategy. An obvious example is that after the outbreak worsened dramatically in the second half of 2020, the president of the United States called for Americans to wear masks and states promulgated measures to limit social distance. On November 15, the Governor of Washington announced statewide restrictions, including prohibiting indoor social gatherings with people outside the home, closing gyms, restaurants and bars that provide indoor services, limiting the number of religious services to 25% of indoor capacity or 200 people, and so on. On December 3, California, where the epidemic was serious, issued a stay-at-home order. After January 2021, the epidemic in the United States has shown a downward trend, but it has not yet reached the time when the policy can be completely relaxed. India adopted a comprehensive blockade containment strategy in the early stage of the epidemic, but it has brought serious economic impact . Although the government has issued an economic stimulus plan, experts said its actual stimulus effect was relatively poor. After the epidemic escalated, India no longer implemented a nationwide lockdown strategy and it was only that some states took some restrictive measures based on the actual situation. Various data showed that the epidemic situation in India was still severe.
Premature easing of anti-epidemic policies
In the face of the epidemic, after the United States declared a state of emergency, stay-at-home orders were issued in many states in late March 2020. However, by the end of April, when there was no clear indication that the epidemic had been successfully controlled, states or territories began to ease the requirements of social distance, and implement the order of reopening, which is likely to be a political response to the high unemployment rate caused by the government shutdown, rather than a public health response to COVID-19 infection . In May, there was a concentrated "resumption of work and production", coupled with the intensification of social conflicts such as the Freudian incident bringing large-scale crowds , which further promoted the escalation of the COVID-19 epidemic in the United States. It can be seen that it is necessary to be vigilant when relaxing epidemic prevention measures, and it is very necessary to maintain control measures before achieving reasonable public health objectives .
Similarly, India implemented a total lockdown policy on 25 March 2020, but before the epidemic stabilized and the daily new cases showed a significant decline, India implemented a phased unblocking strategy from June, with the first wave peaking in mid-September. Since then, virus mutation, large-scale political rallies and religious events, and lack of medical resources have contributed to the rapid deterioration of the epidemic in India. It can be seen that premature relaxation of the policy will bring the risk of repeated epidemics. As of May 30, the two countries have shown signs of easing the epidemic, but if they loosen policy too soon, they may repeat the same mistake. In India in particular, daily new cases only declined slightly and daily new deaths remained high, but there were signs that the Indian government began gradually easing restrictions in June, allowing factories to operate and building activities to resume gradually , which may lead to a rebound of the epidemic in India.
The differences between the two countries in fighting the epidemic
In the fight against the epidemic, the United States focused on treating patients with severe cases, encouraged those with mild symptoms to stay at home, and avoided large-scale lockdown strategies even when the outbreak deteriorated sharply. The cumulative number of COVID-19 cases in the United States now ranks first in the world. And it should be added that under the national system of the United States, the federal government left most of the decision-making power to deal with COVID-19 to the States , which contributed to the impossibility of the large-scale blockade strategy to a great extent. India, by contrast, in the initial stage of the epidemic, focused its decision-making on the national level, adopted a strict containment strategy, implemented a 21-day lockdown strategy across the country, and through the national surveillance network "Comprehensive Disease Surveillance Plan" deployed hundreds of public health workers to monitor millions of citizens in rural, suburban, and urban communities and detect disease clusters early, which to a certain extent contributed to India’s effectiveness in controlling the spread of the virus in the early stages of the epidemic .
In terms of implementing containment strategies, Chinese practice is a typical case. China through strict containment measures such as timely lockdown of Wuhan, strict management of the "four types of people" (confirmed cases, presumptive cases, fever cases, and close contacts) and so on, has successfully brought the epidemic under control without large-scale recurrence of the epidemic. From this point of view, compared with mitigation strategies, containment strategies can control the epidemic more quickly to a certain extent.
In general, in the early stage of the epidemic, India adopted containment strategies, but after that, both the United States and India adopted mitigation strategies. At present, despite the continuing threat of the mutant strain of the virus, there are signs of lax national epidemic prevention policies. For example, by February 2022, many states in the United States have abolished mask laws. Of course, vaccination efforts around the world are in full swing, including the Indian government's expansion of vaccination centers and increased funding in the United States to expand community-based outreach efforts to increase vaccination . At the same time, however, vaccination efforts are also challenged by many factors such as vaccination hesitancy and unequal global distribution of vaccines, and the acceptance and uptake of vaccines are not ideal [11, 29]. WHO experts said that vaccines alone would not end the pandemic, stressing the need to continue to take measures that have been shown to slow the spread of the virus . In the face of the still severe domestic epidemic, the United States and India should take appropriate epidemic prevention measures while accelerating the implementation of vaccination. And according to specific national conditions, containment strategies for faster control of the epidemic can be considered.
There are differences between the epidemic prevention strategies adopted by the United States and India, especially India’s containment strategies which helped it better control the epidemic in the early stage. However, the epidemic in the two countries is still severe in the world. When the virus mutants are coming and the immune barrier is not formed, it is meaningful that the two countries continue to take non-pharmacotherapy intervention measures and accelerate vaccination, according to specific national conditions adopt containment strategies that can control the epidemic more quickly when necessary, and pay attention to the risk of epidemic rebound caused by premature relaxation of epidemic prevention policies.
Availability of data and materials
All data generated or analysed during this study are included in this published article.
Huang C, Wang Y, Li X, et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan China. Lancet. 2020;395(10223):497–506. https://doi.org/10.1016/S0140-6736(20)30183-5.
WHO Director-General's opening remarks at the media briefing on COVID-19 - 11 March 2020. Available from: https://www.who.int/director-general/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---11-march-2020. June 20 June 2021.
Khan M, Adil SF, Alkhathlan HZ, et al. COVID-19: a global challenge with old history, epidemiology and progress so far. Molecules. 2020;26(1):39. https://doi.org/10.3390/molecules26010039.
WHO COVID-19 Dashboard. Geneva: World Health Organization, 2020. Available online: https://covid19.who.int/. Accessed 25 June 2021.
Patiño-Lugo DF, Vélez M, Velásquez Salazar P, et al. Non-pharmaceutical interventions for containment, mitigation and suppression of COVID-19 infection. Colomb Med (Cali). 2020;51(2):e4266. https://doi.org/10.25100/cm.v51i2.4266.
Chung JY, Thone MN, Kwon YJ. COVID-19 vaccines: the status and perspectives in delivery points of view. Adv Drug Deliv Rev. 2021;170:1–25. https://doi.org/10.1016/j.addr.2020.12.011.
The Seychelles is 60% vaccinated, but still infections are rising. That's not as bad as it sounds. Available from: https://edition.cnn.com/2021/05/14/africa/seychelles-covid-vaccination-infection-intl-hnk-dst/index.html. Accessed 20 June 2021.
Giordano G, Colaneri M, Di Filippo A, et al. Modeling vaccination rollouts, SARS-CoV-2 variants and the requirement for non-pharmaceutical interventions in Italy. Nat Med. 2021;27(6):993–8. https://doi.org/10.1038/s41591-021-01334-5.
Chinnaswamy S. Understanding the devastating second wave of COVID-19 pandemic in India. Am J Hum Biol. 2021;33(6):e23671. https://doi.org/10.1002/ajhb.23671.
Ritchie H, Mathieu E, Rodés-Guirao L, et al. Coronavirus Pandemic (COVID-19). Available from: https://ourworldindata.org/coronavirus [Online Resource]. Accessed 26 June 2021.
Mangla S, ZohraMakkia FT, Pathak AK, et al. COVID-19 vaccine hesitancy and emerging variants: evidence from six countries. Behav Sci (Basel). 2021;11(11):148. https://doi.org/10.3390/bs11110148.
WHO Time Series CSV. Available from: https://covid19.who.int/WHO-COVID-19-global-data.csv. Accessed 20 Nov 2021.
Paital B, Das K, Parida SK. Inter nation social lockdown versus medical care against COVID-19, a mild environmental insight with special reference to India. Sci Total Environ. 2020;728:138914. https://doi.org/10.1016/j.scitotenv.2020.138914.
Chen H, Shi L, Zhang Y, et al. Comparison of public health containment measures of COVID-19 in China and India. Risk Manag Healthc Policy. 2021;14:3323–32. https://doi.org/10.2147/RMHP.S326775.
Jiao J, Shi L, Zhang Y, et al. Core policies disparity response to COVID-19 among BRICS countries. Int J Equity Health. 2022;21(1):9. https://doi.org/10.1186/s12939-021-01614-z.
Zhang Y, Olufadewa II, Adesina MA, et al. Lessons from the coronavirus disease 2019 (COVID-19) pandemic response in China, Italy, and the U.S.: a guide for Africa and low- and middle-income countries. Glob Health J. 2021;5(1):56–61. https://doi.org/10.1016/j.glohj.2021.02.003.
Bergquist S, Otten T, Sarich N. COVID-19 pandemic in the United States. Health Policy Technol. 2020;9(4):623–38. https://doi.org/10.1016/j.hlpt.2020.08.007.
Kim J-H, An JA-R, Oh SJ, et al. Emerging COVID-19 success story: South Korea learned the lessons of MERS. Available from: https://ourworldindata.org/covid-exemplar-south-korea. Accessed 6 Mar 2022.
Gupta D, Biswas D, Kabiraj P. COVID-19 outbreak and Urban dynamics: regional variations in India [published online ahead of print, 2021 Mar 3]. GeoJournal. 2021;1–19. doi:https://doi.org/10.1007/s10708-021-10394-6
Ni D.X. A comparative study of novel coronavirus pneumonia prevention and control two strategies and measures. Available from: https://cn.chinadaily.com.cn/a/202003/19/WS5e731e02a3107bb6b57a7913.html. Accessed 20 June 2021.
Ghosh A.; Nundy S.; Mallick T.K. How India is dealing with COVID-19 pandemic. Sens Int. 2020;1(prepublish). doi:https://doi.org/10.1016/j.sintl.2020.100021.
Zhang X, Warner ME. COVID-19 policy differences across US States: shutdowns, reopening, and mask mandates. Int J Environ Res Public Health. 2020;17(24):9520. https://doi.org/10.3390/ijerph17249520.
Wei L, Du YT. The deep-rooted causes of the intensified social contradictions in the United States under the impact of the Covid-19 epidemic——An analysis based on the development of economic globalization. J Beijing Union Univ (Humanit Soc Sci). 2021;19(1):117–24. https://doi.org/10.16255/j.cnki.11-5117c.2021.0014.
Pei S, Kandula S, Shaman J. Differential effects of intervention timing on COVID-19 spread in the United States. Sci Adv. 2020;6(49):eabd6370. https://doi.org/10.1126/sciadv.abd6370.
The Indian capital, New Delhi, was unsealed and it fully reopened shops and shopping centers. Available from: http://henan.china.com.cn/health/2021-06/17/content_41594686.htm. Accessed 20 June 2021.
Kettl DF. States divided: The implications of American Federalism for Covid-19 [published online ahead of print, 2020 May 22]. Public Adm Rev. 2020;https://doi.org/10.1111/puar.13243. doi:https://doi.org/10.1111/puar.13243
Mukherjee S. Disparities, desperation, and divisiveness: Coping with COVID-19 in India. Psychol Trauma. 2020;12(6):582–4. https://doi.org/10.1037/tra0000682.
HHS Provides $66.5 Million to expand community-based outreach efforts to increase COVID-19 vaccinations. Available from: https://www.hhs.gov/about/news/2022/02/08/hhs-provides-66-5-million-expand-community-based-outreach-efforts-increase-covid-19-vaccinations.html. Accessed 1 Mar 2021.
Forni G, Mantovani A. COVID-19 Commission of Accademia Nazionale dei Lincei, Rome. COVID-19 vaccines: where we stand and challenges ahead. Cell Death Differ. 2021;28(2):626–39. https://doi.org/10.1038/s41418-020-00720-9.
UN News. Low-income countries have received just 0.2 per cent of all COVID-19 shots given. Available from: https://news.un.org/en/story/2021/04/1089392. Accessed 2 May 2022.
The authors thank all study participants who have been involved and contributed to the data collection. The authors gratefully acknowledge the financial supports by the Natural Science Foundation of Guangdong Province in 2022: Construction and application of COVID-19 control model PSR-SOR-Haddon in Guangdong Province (No. 2022A1515011112).
This study was supported by the Natural Science Foundation of Guangdong Province in 2022: Construction and application of COVID-19 control model PSR-SOR-Haddon in Guangdong Province (No. 2022A1515011112).
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Yang, J., Shi, L., Chen, H. et al. Strategies comparison in response to the two waves of COVID-19 in the United States and India. Int J Equity Health 21, 57 (2022). https://doi.org/10.1186/s12939-022-01666-9
- Non-pharmacotherapy intervention
- The United States and India