到目前为止，所有的美国病毒感染者都是来自中国日本，或者和中国日本来的人有过密切接触。
昨天首次发现的病例，既没有出过国、也没有和其他已知感染者接触过，传播途径完全不清楚。这意味着，病毒已经开始在美国国内传播。
消息传出后，美国股市再次大幅下跌。
A person in California who was not exposed to anyone known to be infected with the coronavirus, and had not traveled to countries in which the virus is circulating, has tested positive for the infection.
It may be the first case of community spread in the United States, the Centers for Disease Control and Prevention said on Wednesday.
“At this point, the patient’s exposure is unknown,” the C.D.C. statement said. “The case was detected through the U.S. public health system and picked up by astute clinicians.”
昨天首次发现的病例，既没有出过国、也没有和其他已知感染者接触过，传播途径完全不清楚。这意味着，病毒已经开始在美国国内传播。
消息传出后，美国股市再次大幅下跌。
A person in California who was not exposed to anyone known to be infected with the coronavirus, and had not traveled to countries in which the virus is circulating, has tested positive for the infection.
It may be the first case of community spread in the United States, the Centers for Disease Control and Prevention said on Wednesday.
“At this point, the patient’s exposure is unknown,” the C.D.C. statement said. “The case was detected through the U.S. public health system and picked up by astute clinicians.”
