Fields Virology, 6th Edition

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which are pathogens of cattle, horses, and swine,523 and the bainiviruses, whose sole member is the only nidovirus cur-rently known to infect ish.505 This chapter will concentrate almost exclusively on the Coronavirinae. Coronaviruses have long been sorted into three groups, orig-inally on the basis of serologic relationships and, subsequently,

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