Abstract:Introduction. Many viruses produce characteristic lesions, known as pocks or plaques, on the chorio-allantois of the developing chick embryo. The first to be successfully propagated on this membrane was fowl pox (1). Since then, Burnet and his collaborators (2, 3) have determined the potencies of suspensions of a number of viruses such as vaccinia (4), herpes simplex (5), influenza (6), ectromelia (7), myxoma (8), laryngotracheitis (9), and fowl pox (10), by estimating the average number of pocks produced at s… Show more
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