还是戴口罩好吧：
空气传染的证据：60个人身体看起来完好参加合唱团，3个星期后，45人得病，3人住院，2人死亡。
The deadly outbreak among members of a choir has stunned health officials, who have concluded that the virus was almost certainly transmitted through the air from one or more people without symptoms.
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Coronavirus choir outbreak
Skagit Valley Chorale members Mark Backlund and his wife, Ruth Backlund, sing choir music Friday at their home in Anacortes, Wash., while convalescing from COVID-19. (Karen Ducey / For The Times)
By RICHARD READSEATTLE BUREAU CHIEF
MARCH 29, 2020 7:34 PM
MOUNT VERNON, Wash. — With the coronavirus quickly spreading in Washington state in early March, leaders of the Skagit Valley Chorale debated whether to go ahead with weekly rehearsal.
The virus was already killing people in the Seattle area, about an hour’s drive to the south.
But Skagit County hadn’t reported any cases, schools and businesses remained open, and prohibitions on large gatherings had yet to be announced.
On March 6, Adam Burdick, the choir’s conductor, informed the 121 members in an email that amid the “stress and strain of concerns about the virus,” practice would proceed as scheduled at Mount Vernon Presbyterian Church.
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“I’m planning on being there this Tuesday March 10, and hoping many of you will be, too,” he wrote.
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The Mount Vernon Presbyterian Church in Mount Vernon, Wash. (Karen Ducey / For The Times)
Sixty singers showed up. A greeter offered hand sanitizer at the door, and members refrained from the usual hugs and handshakes.
“It seemed like a normal rehearsal, except that choirs are huggy places,” Burdick recalled. “We were making music and trying to keep a certain distance between each other.”
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After 2½ hours, the singers parted ways at 9 p.m.
Nearly three weeks later, 45 have been diagnosed with COVID-19 or ill with the symptoms, at least three have been hospitalized, and two are dead.
The outbreak has stunned county health officials, who have concluded that the virus was almost certainly transmitted through the air from one or more people without symptoms.
“That’s all we can think of right now,” said Polly Dubbel, a county communicable disease and environmental health manager.
In interviews with the Los Angeles Times, eight people who were at the rehearsal said that nobody there was coughing or sneezing or appeared ill.
