Winston K Marks' "Mate in Two Moves" (novelette, plague, free): A highly infectious virus that makes people fall in love!
As the world is falling apart because everyone is falling in love, is jealous about the partner, cannot concentrate on anything else, etc, Dr Phyllis Sutton begins suspecting the cause might be biological.
She will isolate the new virus that increases the grandular activity, get infected herself, get fixed as cure is found, & finally get a relapse that isn't as dangerous...
Fact sheet.First published: Galaxy, May 1954.
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Related: Stories of Winston K Marks.