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Is strep throat contagious?
Strep throat is moderately contagious and is most commonly spread via direct person-to-person contact.
Passage of airborne droplets and/or saliva from the infected individual to
another is the most likely mechanism of contracting strep throat. As such,
close living quarters (home, classroom, day care centers, college dorms, etc.)
provide an ideal environment for passage of GAS bacteria from one person to
another. The risk of contracting a strep throat infection is approximately
40% in household environments. Most infectious disease specialists believe
that a patient is no longer contagious after 24 hours of effective antibiotic
therapy. Spread of strep bacteria via food borne transmission is less
common than direct person-to-person exchange of droplets or saliva. The
exact likelihood of developing strep throat from family pets is unknown, but
most experts believe it is minimal.