Figure 2.

Modified Centor scoring system: Used to calculate the risk of streptococcal pharyngitis and to decide whether RADT and antimicrobial therapy should be initiated in patients presenting with sore throat. Clinicians should consider performing RADT for those with scores of 2 if they are pediatric patients, if they are at risk of complications (immunocompromised or frail), or if they appear clinically unwell.

GAS—group A streptococcus, RADT—rapid antigen detection testing.

^*The decision matrix has been defined for ages 5–14 y, as those aged younger than 3 y require backup validation with throat culture regardless of scoring. Values from McIsaac et al.¹⁸