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Influenza develops rapidly with a high fever accompanying chills and malaise. Respiratory symptoms such as nasal discharge, cough and sore throat, gastrointestinal symptoms such as vomiting and diarrhoea, headache, joint pain, muscle pain, etc., frequently accompany it, but they are non-specific symptoms. On the other hand, influenza follicles in the posterior pharyngeal wall are very characteristic physical findings for the seasonal influenza diagnosis.1 Sakuma’s well-known paediatric pharynx findings textbook in Japan2 notes influenza follicles in the posterior pharyngeal wall.
However, the textbook is written only in Japanese and is not indexed in the search systems of …