‘A study published in Science analyzed surveillance and contact tracing data from two South Indian states, Tamil Nadu and Andhra Pradesh, collected through August 1. This is one of the few studies that captures the epidemiology of COVID-19 in low- or middle-income countries on a large scale. Together, these states account for approximately 10% (127.8 million) of India’s national population, and they contain the most robust healthcare workforces and public health infrastructure in the country. The study provides a detailed look at the timeline and growth of the COVID-19 epidemics in these states, including incidence and mortality.
‘The researchers found that the majority of cases (71%) did not result in secondary transmission to any of their contacts identified through contact tracing efforts. Based on data collected from more than 600,000 cases and contacts, the researchers estimate that 8% of the detected COVID-19 cases accounted for 60% of the transmission, providing further evidence that super-spreading events play a major role in the COVID-19 pandemic. The researchers also identified that transmission among individuals of approximately the same age was highest among children under 15 years old and adults 65 years and older. While the researchers were not able to determine the degree of transmission from children to adults, the study results support that pediatric cases do play a role in the ongoing pandemic. Overall, the case fatality ratio was 2.06%, and generally increased with age; however, unlike the US, mortality tended to plateau rather than increase in individuals 75 years and older. The reasons for this trend are uncertain. Additionally, the median hospital admission time before death was 6 days.’
Read here (John Hopkins Newsletter, Science, Sept 30, 2020)
