Abstract
Poliovirus and reovirus were found to aggregate into clumps of up to several hundred particles when diluted 10-fold into distilled water from a stock preparation of minimal aggregation in 0.05 M phosphate buffer, pH 7.2, plus 22 to 30% sucrose. Reovirus was also found to aggregate when diluted into phosphate-buffered saline. The aggregation was concentration dependent and did not occur when either virus was diluted into water 100-fold or greater. The aggregation of poliovirus was reversible by further addition of saline and produced a dispersed preparation of virus. Reovirus aggregation was not reversible. Both viruses aggregated when diluted into buffers at pH 5 and 3, and poliovirus aggregated at pH 6, and this aggregation of both viruses was reversible when returned to pH 7. Aggregation did not occur at alkaline pH values. Aggregation at low pH could be caused aggregation of either virus at pH 7. Calcium ions, however, were found to aggregate both viruses at a concentration of 0.01 M.
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