BA.2 is a novel omicron offshoot of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)that has gone viral.There is limited knowledge regarding this variant of concern.Current evidence suggests that this variant is more contagious but less severe than previous SARS-CoV-2 variants.However,there is concern regarding the virus mutations that could influence pathogenicity,transmissibility,and immune evasion.
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机译：Hopkins，Raymond F.和puchala，Donald J.，Global Food Interdependence：Challenge to american Foreign policy，New York，Columbia University press，1980,214 p。
