Jason Beaubien

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In the largest study ever of transmission patterns for COVID-19, researchers in India tested more than a half-million contacts of 85,000 cases to examine how and to whom the coronavirus is spreading.

The first interesting finding: Children are spreading the virus amongst themselves and also to adults. Second: The greatest risk for infection among the people studied in the two southern Indian states of Tamil Nadu and Andhra Pradesh is a long bus or train ride.

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Today the Trump administration formally notified the United Nations that it is pulling out of the World Health Organization. For more on this move, NPR's global health correspondent Jason Beaubien joins us now.

Hey, Jason.

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This afternoon, President Trump said he is severing U.S. ties with the World Health Organization over the U.N. agency's handling of the coronavirus pandemic.

(SOUNDBITE OF ARCHIVED RECORDING)

Over the past month, Hong Kong has averaged one new confirmed coronavirus case a day.

Taiwan has reported only one case in the past three weeks. The situation is similar in Vietnam. Although the number of coronavirus cases continues to grow globally, there are places that have managed to successfully control COVID-19.

New Zealand's triumph

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DAVID GREENE, HOST:

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The worst outbreaks of COVID-19 so far have been in colder parts of the Northern Hemisphere during winter or early spring. Will warmer weather slow the transmission?

Could the Southern Hemisphere see outbreaks intensify as that part of the globe moves into winter?

And is it possible that transmission might be naturally interrupted as it is each year for the seasonal flu?

These are some of the key questions about COVID-19 that scientists are trying to answer.

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