This is when people who have contracted coronavirus are at their most contagious, according to data reviewed by the WHO. Knowing when an infected person can spread SARS-CoV-2 is as important as where and/or how the virus can be transmitted.
The number of coronavirus cases currently exceeds 21 million globally, according to the latest data aggregated by Johns Hopkins University’s Center for Systems Science and Engineering, but the actual number of cases is likely much higher.
One case study of the quarantined Italian town of Vò published in the peer-reviewed journal Nature in June revealed more than 40% of COVID-19 infections had no symptoms. “If we find a certain number of symptomatic people testing positive, we expect the same number of asymptomatic carriers that are much more difficult to identify and isolate,” according to Enrico Lavezzo, a professor in the University of Padua’s department of molecular medicine.
The virus can be detected in people one to three days before their symptom onset, with the highest viral loads around the day of the onset of symptoms, followed by a gradual decline over time, according to the World Health Organization. However, all studies on asymptomatic people have limitations, the WHO added: “For example, some studies did not clearly describe how they followed up with persons who were asymptomatic at the time of testing to ascertain if they ever developed symptoms. Others defined ‘asymptomatic’ very narrowly as persons who never developed fever or respiratory symptoms, rather than as those who did not develop any symptoms at all.
California Gov. Gavin Newsom, a Democrat, last month announced a rollback of operations statewide at restaurants as well as bars, zoos, wineries, museums, card rooms and movie theaters. “This is in every county in the state of California, not just those on the watch list,” he said. “Despite ample warning, the U.S. squandered every possible opportunity to control the coronavirus. And despite its considerable advantages — immense resources, biomedical might, scientific expertise — it floundered,” he wrote in the September issue of The Atlantic.
New York City, the onetime U.S. epicenter of the pandemic, was a case study in how some Americans fared better than others and how the virus is transmitted. Black and Latino people were hospitalized at twice the rate of Caucasians during the peak of the crisis, data released in May by the city showed.
President Donald Trump earlier this month bypawhssed the nation’s lawmakers as he claimed the authority to defer payroll taxes and replace an expired unemployment benefit with a lower amount after negotiations with Congress on a new coronavirus rescue package collapsed.
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