noun
the capacity of a microorganism to cause infection
adjective
describing the ability of a microorganism to infect
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The infectivity of the virus is a major concern for public health officials.
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The infectivity of this flu strain is no joke, so make sure to wash your hands frequently.
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Dude, the infectivity of this thing is off the charts. Stay safe out there.
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His negativity has an infectivity that can bring down the whole team if we're not careful.