回不了飛飛的貼，另開一貼吧，疫苗新聞，我是看華washingtonpost的

Preliminary findings about their efficacy were based on the number of people who became ill, not on whether the vaccines prevented infection.

“Although [preventing infection] might be the ultimate effect, we do not know that at this point,” says Fauci, the nation’s most recognized expert on the pandemic. “The primary endpoint [in these studies] was the prevention of symptomatic infection. So it is conceivable that the vaccine would protect you against clinical disease, but not necessarily protect you against infection.”