опять журналисты все переврали

это фейк

https://www.stopfake.org/ru/fejk-voz-neozhidanno-zayavila-chto-pandemii-koronavirusa-net/

уже писалa

https://foren.germany.ru/showmessage.pl?Number=36707549&Board=health

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ПС специально для вас: вот это документ, на который ВОЗ ссылался

https://www.who.int/publications/i/item/advice-on-the-use-of-masks-in-the-community-during-home-care-and-in-healthcare-settings-in-the-context-of-the-novel-coronavirus-(2019-ncov)-outbreak

тут черным по-белому все написано

Current evidence suggests that most transmission of COVID19 is occurring from symptomatic people to others in close contact, when not wearing appropriate PPE...

There is also the possibility of transmission from people who are infected and shedding virus but have not yet developed symptoms; this is called pre-symptomatic transmission...

Some people infected with the COVID-19 virus do not ever develop any symptoms, although they can shed virus which may then be transmitted to others.

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и еще новая статья про сверхраспространителей в Японии

https://wwwnc.cdc.gov/eid/article/26/9/20-2272_article

We analyzed 3,184 cases of coronavirus disease in Japan and identified 61 case-clusters in healthcare and other care facilities, restaurants and bars, workplaces, and music events. We also identified 22 probable primary case-patients for the clusters; most were 20–39 years of age and presymptomatic or asymptomatic at virus transmission.