Abstract
Summary
1. Data are presented showing that the MEF1 (Type 2) baby mouse adapted strain of poliomyelitis virus can be lyophilized with little loss of infectious activity. The same appears to be true of the Leon (Type 3) mouse adapted strain. 2. Heating the dry MEF1 virus indicates that, although part of the viral population appears to be relatively heat labile, a measurable proportion of the virus particles is quite resistant to heat. 3. The epidemiological implications of the possible presence of dry poliomyelitis virus in nature are discussed.
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