Abstract
Summary
Except for the seasonal insusceptibility of eggs during late summer and fall, reliable and reproducible infectivity assays were performed on 3 representative strains of trachoma virus isolated in United States. In general the linear inverse relationship between amount of virus and time of death applied to these trachoma viruses. One strain (ASGH) tended to kill eggs one day earlier than another strain (BOUR) at all inoculum levels. The strains were ether labile, and rapidly lost infectivity at 37°C or above. Sodium desoxycholate interfered with staining properties of virus far more than with infectivity.
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