Strep throat is contagious starting from the time you get infected and during the incubation period of about two to five days before symptoms appear. It is highly contagious while symptoms are present, especially in the first two to three days of illness. People with strep throat can spread it to others through respiratory droplets released when they cough, sneeze, or talk, as well as through direct contact with infected surfaces or sores. Once antibiotic treatment begins, the contagious period is significantly reduced. People typically are no longer contagious about 12 to 48 hours after starting antibiotics. Without treatment, a person can remain contagious for up to 2 to 3 weeks. In summary:
- Contagious during the incubation period (2-5 days before symptoms)
- Highly contagious when symptoms are present (especially first 2-3 days)
- Contagious until 12-48 hours after starting antibiotics
- Without treatment, contagious for up to 2-3 weeks
Taking antibiotics helps stop the spread quickly, and good hygiene like hand washing and covering coughs also helps reduce transmission.
