> "usually by one's own exertions" does not fit contracting a disease or being infected. In professional settings, terms get chosen for ability to reliably con

> "usually by one's own exertions" does not fit contracting a disease or being infected. In professional settings, terms get chosen for ability to reliably convey specific scenarios. I suspect that ability better determines their adoption, rather than how they might align with language norms of a particular decade.