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Introduction
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 Japan 2 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 other languages. Therefore, these physical findings are not widely known globally, although they are famous in Japan.
Case
A 27-year-old female healthcare worker with an unremarkable medical history presented to an outpatient clinic with a fever of 39°C, which she had since the previous day. The symptoms included...