Where the test virus does not demonstrate measurable cytopathogenic reactions in subculture growth systems, in vitro testing would be considered presumptive. |
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The analyses of the plaques and the cytopathogenic effect were performed 3-6 days later. |
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Recovery of cytopathogenic agent from chimpanzees with coryza. |
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Cytopathogenic effect of poliomyelitis viruses in vitro on, human embryonic tissues. |
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