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In March 2020, with coronavirus disease 2019 (COVID-19) threatening to overwhelm

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In March 2020, with coronavirus disease 2019 (COVID-19) threatening to overwhelm India’s fragile health care ecosystem, the country combined a stringent lockdown of its 1.37 billion population with a program of surveillance and containment of varied effectiveness across states. Testing and data management systems were set up, but the paucity of publicly available data, especially in the initial phase of the pandemic, limited understanding of disease epidemiology and transmission dynamics as well as the effectiveness of control measures. On page 691 of this issue, Laxminarayan et al. (1) present findings from government-implemented surveillance during the first 4 months of the pandemic in the two southern states of Tamil Nadu and Andhra Pradesh in India. They use data from, and after, the lockdown period to make important observations on the dynamics of infection, transmission, and risk factors. This collaboration between the state governments of Tamil Nadu and Andhra Pradesh and academic researchers is a valuable template for federal government agencies.
The public health response to infectious disease outbreaks is founded on the ability to mount a coordinated strategy that combines measuring and tracking cases to assess the efficacy of interventions. For COVID-19, testing, tracing, treating and isolating cases, quarantining contacts, as well as widespread mask wearing and social distancing were, and are, the tools for transmission control. India’s population is second only to China’s approximately 1.41 billion, in one-third of the land area, and so when severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) began its relentless spread outside China, there were concerns about the ability of low- and middle-income countries (LMICs) to deploy public health tools, given their limited health care capacity.
Although there were limitations in tracking in many parts of the world, the data from hospitals and laboratories were widely available, allowing modelers in academia and public health systems to use data from China and the industrialized world early in the pandemic to build predictive models based on the government strategies that were developed (2). Although useful, these models are sensitive to underlying assumptions about contact patterns and transmissibility of the infection, which are affected by population density, occupation, and social structures. In India and other LMICs, the lack of information sharing for analysis between government agencies with access to the data and academic groups with the skills to perform these analyses resulted in control strategies being widely debated because the evidence base for policy was unclear (3, 4).
Despite the perpetual underinvestment in public health in India, both Andhra Pradesh and Tamil Nadu have functional public health departments. Laxminarayan et al. describe scaling of contact tracing to reach more than 3 million exposed contacts and collect epidemiological and laboratory data from 575,051 contacts of cases in the first 4 months of the pandemic, when such extensive contact tracing was most likely to be beneficial. The surveillance was not perfect. There were variations in the effectiveness of screening across districts, with most cases having an improbably low number of exposed contacts. Testing strategies changed multiple times as the public health response adapted to emerging challenges, complicating analyses of infection rates and infection fatality ratios. Despite these limitations and the subsequent escalation in cases (see the figure), the authors have generated important insights.
The study highlights the importance of “superspreaders” in fueling the pandemic. Although there were limitations in contact tracing, and hence in the evaluation of secondary cases and of transmission chains, the finding that a minority of cases were associated with most transmission events (superspreading) is consistent with the emerging data across the globe (5, 6). The determinants of superspreading are not well understood, but it is likely to be a function of social interaction patterns of the infectious host, the environment, and biological characteristics of the infectious agent. Identifying the characteristics of settings where superspreading events are likely will help target control measures and screening for those settings to maximize limitation of transmission. However, focused control measures must be balanced against the potential for further stigmatization of individuals with COVID-19 beyond that already reported (7).

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