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In recent years a new group of viruses has been recognized as a cause of respiratory illness in man [1]. Prototype strains have been designated as B814, 229E, and IBV-like virus [2-4]. These viruses have been shown by negative-contrast electron microscopy to resemble morphologically avian infectious bronchitis virus (IBV) and mouse hepatitis virus (MHV) [5, 6]. This characteristic structural resemblance and other shared
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Kaye et al. (1969) studied this question.
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