>>520
何よりもマスクだよ。
手洗いで防げるモノからの感染は少ない。サイエンスによると6%だ。
そもそもモノへに付着するウイルスもほとんどが口から吐き出されてるし。

https://science.sciencemag.org/content/368/6491/eabb6936

The contributions to R0 included 46% from presymptomatic individuals (before showing symptoms),
38% from symptomatic individuals,
10% from asymptomatic individuals (who never show symptoms),
and 6% from environmentally mediated transmission via contamination.
Results on the last two routes are speculative.