Contagious period for strep throat

Strep throat is a bacterial infection of the throat. It can pass through respiratory droplets, saliva, and shared objects during close contact. A person may be infectious before the diagnosis is confirmed, even when symptoms are still developing. Fever, throat pain, and swollen glands are common features, but these symptoms can also occur with other illnesses.

A clinician may use an examination and testing to decide whether antibiotics are appropriate. Antibiotics treat confirmed or strongly suspected bacterial infection; they do not treat viral sore throats. Take the medicine exactly as prescribed and do not share it with another person.

Stay home while unwell and follow medical advice about returning to school, nursery, or work. Avoid sharing drinks, utensils, toothbrushes, and towels. Wash hands regularly, cover coughs and sneezes, and keep commonly touched surfaces clean. Close contacts should watch for a new fever or sore throat rather than taking antibiotics without assessment.

A [GP Consultation](/treatments/consultations-and-assessment/gp-consultation/) can help distinguish strep throat from [Tonsillitis](/conditions/tonsillitis/) or a viral illness. More information about [Antibiotic Treatment](/treatments/medical-management/antibiotic-treatment/) can help you use prescribed medicine safely.

Arrange medical advice for a persistent or severe sore throat, fever, swollen neck glands, or difficulty eating and drinking. Seek urgent help for breathing difficulty, drooling because swallowing is too painful, dehydration, confusion, or rapidly increasing swelling. Contact the clinician if symptoms worsen, fail to improve, or return after treatment.

Ask whether testing is needed, when the person can safely return to normal activities, whether household contacts need assessment, and what to do if a dose is missed. Mention any [Fever](/symptoms/fever/), [Sore Throat](/symptoms/sore-throat/), or [Swollen Glands](/symptoms/swollen-glands/) that are worsening.