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On Monday, a World Health Organization (WHO) announced that coronavirus asymptomatic patients do not significantly contribute to the spread of the virus. "Data we have, thatseems to be rare for an asymptomatic person actually transmits to the other to a secondary person "Maria van Kerkhove, PhD, Helicol The Emerging Diseases of WHO and Zoonose Unity, told a news briefing. "It's very rare." The statement - in particular, the use of Van Kerkhove's "very rare" phrase, much as a major change in previous announced research. Has the WHO returned to his statement, but an infectious disease, we talked before WHO's clarification expressed concern about the declaration - and urges people to continue caution.

"I am not as confident that the spread of asymptomatic or pre-symptomatic individuals is rare," saysThomas Russo, MD,Head of Infectious Disease Division at the University of Buffalo. Although there is a distinction between asymptomatic patients (those who never develop symptoms) and pre-symptomatic patients (those who are infected but have not yet developed symptoms), Russo says that both groups "are Functionally equivalent to the two could expand the virus when healthy. "

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In May, for example, disease control and prevention centers (CDC) felt that40% of infections were without symptoms (including asymptomatic and pre-symptomatic people).

Russo said, "I feel at this point, it is much safer to suppose that it happens more than rarely to keep people safe." He adds that the WHO declaration was "premature" and potentially dangerous, because it "risks generating a false sense that if you feel good, you are not infectious."

Who received a ton of comments after Van Kerkhove's comments, inviting a Market Briefing Tuesday in which she andMike Ryan, MPH, Executive Director of WHO's Emergency Health Program, has somewhat clarified understanding of the organization of asymptomatic propagation.

"What I was calling yesterday in the press conference was very few studies that tried to look at asymptomatic cases over time," said Van Kerkhove, referencing contact tracing data not yet published. "And it's a very small subset of studies, and so I answered a question at the press conference. I did not indicate a policy."

Van Kerkhove and Ryan added that the number ofPeople who are asymptomatic And those who are asymptomatic and transmit the virus are always a "unknown major". "Whatever the proportion of the disease that transmit asymptomatic individuals - and, as Maria said, it's unknown ... It's happening. I am absolutely convinced that this happens," said Ryan. "The question is how much."

Russo accepts, saying that it is not about whether asymptomatic and pre-symptomatic coronavirus patientscan Spread Covid-19-but to what extent it happens. "We know you can be asymptomatic / pre-symptomatic and spread infection," says Russo. "The question that is unresolved is the part of the secondary cases resulting from this mode of transmission. I doubt it is rare-but the time will say." And for more perspectives on why people react differently to coronavirus,That's why some people have coronavirus symptoms and others no.