Read the text carefully and then choose the correct answers.

In a study released early on the JAMA web site, researchers from the University of Toronto and hospitals in the area describe the rapid spread of the coronavirus that causes severe acute respiratory syndrome (SARS). Beginning with a single patient at a community hospital who acquired the virus from another family member who had traveled to China, health care workers became infected. Further spread occurred as patients were transferred among hospitals before the source of inflections and the nature of SARS were identified. Laboratory product companies are working on a test that could be used to diagnose SARS quickly. Many - drug companies are ready working on a SARS vaccine. Even if a vaccine is found, it will surely take several years before it is available for wide public distribution.

Up to now _______ in Toronto.

there is only one patient of SARSsome doctors and nurses in hospitals have been infectedthere have been many patients of SARS

B and C

Hướng dẫn giải:

Thông tin: Beginning with a single patient at a community hospital who acquired the virus from another family member who had traveled to China, health care workers became infected. Further spread occurred as patients were transferred among hospitals before the source of inflections and the nature of SARS were identified.

Dịch: Bắt đầu với một bệnh nhân duy nhất tại bệnh viện cộng đồng bị nhiễm vi rút từ một thành viên khác trong gia đình đã đến Trung Quốc du lịch, các nhân viên y tế đã bị nhiễm vi rút. Sự lây lan tiếp tục xảy ra khi bệnh nhân được chuyển giữa các bệnh viện trước khi nguồn lây nhiễm và bản chất của SARS được xác định.

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