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The production of plaques by psittacosis virus on monolayers of McCoy cells is described in this preliminary report. Plaques appeared in five to seven days and ranged in diameter from 0.2 to 0.5 millimeter. Formation of plaques was inhibited by psittacosis antiserum, which confirmed their virus specificity. The relationship between plaque numbers and virus concentration was linear.
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Kozikowski et al. (1964) studied this question.
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