Health
Largest COVID-19 contact tracing is evidence of superspreaders, where kids find the key to spreading
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A study of more than 500,000 people in India exposed to the new coronavirus SARS-CoV-2, or COVID-19, found that continued spread of the virus was caused by a small proportion of infected people. Suggests.
In addition, with children Young adult According to a paper by US and Indian researchers published in the journal on September 30, it may be much more important to infect the virus, especially at home, than previous studies have identified. I understand. Science..
Researchers at the Princeton Institute for Environmental Studies (PEI), Johns Hopkins University, and the University of California, Berkeley have worked with public health authorities in Tamil Nadu and Andrapradesh in southeastern India to transmit and kill 575,071 exposed people. I tracked the rate. ~ 84,965 confirmed cases of SARS-CoV-2. This is the world’s largest contact tracing study on any disease, the process of identifying who has come into contact with an infected person.
Ramanan Laxminarayan, senior researcher at PEI, said the paper was the first large-scale study to capture the anomalous range of COVID-19 dependence on “superspreaders” and a small portion of the infected population. Said to let the virus pass. To more people. Researchers found that 71% of infected individuals did not infect any of their contacts, while only 8% of infected individuals accounted for 60% of new infections.
“Our study shows the greatest empirical evidence of the Superspreader we are aware of in all infectious diseases,” says Laxminarayan. “If you’re seeing the COVID-19 epidemic both in India and perhaps everywhere affected, the rule is a super-spread event, no exception.”
Researchers say the findings provide extensive insight into the prevalence and deadlines of COVID-19 in countries that have experienced more than 96,000 deaths from COVID-19, such as India, which has a high incidence of resource-constrained populations. Reported.They found it CoronavirusRelated deaths in India occurred on average 6 days after admission, compared to an average of 13 days in the United States. Also, deaths from the coronavirus in India are concentrated in people aged 50-64, which is slightly younger than the US population at risk over the age of 60.
However, researchers also reported the first large-scale evidence that the implementation of a national closure in India led to a significant reduction in the transmission of the coronavirus.
Researchers have found that people with the coronavirus, regardless of age, have a range of 2.6% in the community to 9% in the home to inherit it in close contact. Researchers have found that children and young adults, who make up one-third of COVID cases, are particularly important for transmitting the virus in resource-constrained populations.
“In this setting, the child is a very efficient transmitter. This was not well established in previous studies,” says Laxminarayan. “The reported cases and deaths were found to be concentrated in a younger cohort than expected based on observations in high-income countries.”
Studies show that children and young adults were much more likely to be infected with the coronavirus from patients of the same age. In general, same-age contacts of all age groups significantly increased the likelihood of infection, with a probability of catching coronavirus ranging from low-risk to high-risk contacts, each ranging from 4.7 to 10.7%.
“Epidemiology and Infectious Dynamics of COVID-19 in Two Indian States” Science (2020). science.sciencemag.org/cgi/doi… 1126 / science.abd7672
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Princeton University
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