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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
Kaye et al. (Sat,) studied this question.