Table 2. Risk of Streptococcus pyogenes infection based on the modified Centor score (McIsaac score) (McIsaac WJ, JAMA 2004;291:1587-95).

Total score	Risk of Streptococcus pyogenes infection (%)
≥4	51–53
3	28–35
2	11–17
1	5–10
≤0	1–2.5