Strep Throat vs. Tonsillitis: Key Differences

Strep throat is a specific bacterial infection caused by Streptococcus pyogenes (Group A Strep). Tonsillitis is inflammation of the tonsils, which can be viral or bacterial.

Comparison

FeatureStrep ThroatTonsillitis
CauseGroup A Strep onlyViral (adenovirus, EBV, etc.) or bacterial (Strep, others)
OnsetAbruptVariable
FeverHigh (>101°F/38.3°C)Variable
CoughAbsentCommon (viral)
ExudatesCommon (white patches)Common (bacterial)
LymphadenopathyTender anterior cervicalVariable
TreatmentPenicillin/amoxicillinSupportive (viral); antibiotics if bacterial

Strep can cause tonsillitis, but most tonsillitis is viral. Rapid strep test or throat culture confirms strep. Untreated strep risks rheumatic fever and peritonsillar abscess.

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