infectivity

noun
in·​fec·​tiv·​i·​ty | \ ˌin-ˌfek-ˈtiv-ət-ē How to pronounce infectivity (audio) \
plural infectivities

Medical Definition of infectivity

: the quality of being infective : the ability to produce infection specifically : a tendency to spread rapidly from host to host — compare virulence sense b

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