and other nations have struggled to implement adequate testing to gauge how widespread the disease has become. “The asymptomatics are still important, particularly if you want to get levels of virus down to very low levels of transmission," said Peter Collignon, a professor of clinical medicine at the Australian National University Medical School in Canberra, who advises the Australian government on infection control.īecause identifying asymptomatic cases is so difficult, the U.S. I’d have to look at why she’s saying that, because it runs counter to everything, the growing body of evidence over the last five months."Ĭountries across the globe have been wary of relaxing social-distancing guidelines and rigid travel restrictions, fearing that people without symptoms could spread the Covid-19 pathogen unchecked throughout communities. “If you look at the data overall, I think it’s overwhelming that there has to be asymptomatic carriers that are spreading," said Mark Dybul, the co-director of Georgetown University’s Center for Global Health Practice and Impact. Her comments elicited criticism from some public health experts. Van Kerkhove also said asymptomatic patients tend to be younger and without underlying medical conditions. I also referred to some data that isn’t published."Van Kerkhove said that while it’s known there are some asymptomatic patients who can transmit the virus, it needs to be better understood how many of the people in the population don’t have symptoms and separately, how many of those individuals go on to transmit to others. What I was referring to was a subset of studies. I used the phrase ‘very rare’ and I think that’s a misunderstanding to state asymptomatic transmission globally is very rare. I was just trying to articulate what we know. “I was responding to a question, not stating a policy of the WHO. In a live event on social media to take questions from the public on Tuesday, Kerkhove said her comments referred to two to three studies that have been published and that try to follow asymptomatic cases over time and look at all their contacts to see how many additional people were infected.“That’s a very small subset of studies," said Van Kerkhove, a WHO epidemiologist. Kerkhove attempted to downplay her comment Monday that asymptomatic transmission of coronavirus is “very rare", an assessment that revived controversy over transmission routes. Ryan said he's "absolutely convinced" that transmission by asymptomatic cases is occurring. "There is a period just as a person is becoming unwell when the virus spreads, that is what makes it so hard to stop," said Ryan. Ryan said lockdowns had great impact in stopping transmission and that we'll see "small spikes" in cases and have to make they don't turn into big new peaks. WHO Health Emergencies Programme Executive Director Michael Ryan said, "Question remains how does someone who is asymptomatic spread coronavirus, studies show it can be projected by people in choirs, gyms."
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