May one trap or kill a flea on Shabbat?

ShabbatTrapping (Tzad)

Synopsis

The Mechaber rules that a flea may not be trapped unless it is on one's body and biting, and even then it may not be killed. The Rema adds one should not squeeze it between one's fingers lest one kill it. Lice, however, may be killed. Different rules apply to delousing clothes vs. head.

Rishonim
Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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