Low grade myth: The eggs of pinworms germs of a vaginitis could conceivably get under your nails if you itch the area. PW eggs are laid by the pregnant female at your anus & contaminate bed linen or underwear. Touching contaminated fingers to your mouth can return the eggs to re-infest you. I doubt the length of your nails has anything to do with such a process & might decrease the risk.
Answered 3/20/2019
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CDC recommends it: Per CDC: "hand hygiene includes diligently cleaning & trimming fingernails, which may harbor dirt & germs & can contribute to the spread of some infections, such as pinworms. Fingernails should be kept short, & the undersides should be cleaned frequently with soap & water. Because of their length, longer fingernails can harbor more dirt & bacteria than short nails"
Answered 9/16/2020
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