Bacterial pharyngitis is more common in winter (or early spring), while enteroviral infection is more common in the summer and autumn. Pharyngitis is most common in school-aged children during the winter months. Seasonal colonisation with group A Streptococcus (GAS) reaches its peak (up to 20% of children) during this season. GAS pharyngitis is the focal point of clinical interest in pharyngitis, as the main goal of therapy is prevention of rheumatic fever associated with this organism. GAS pharyngitis, however, represents less than one third of all cases of acute pharyngitis.
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