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In page Lemierre's syndrome:

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Lemierre's syndrome begins with an infection of the head and neck region, with most primary sources of infection in the palatine tonsils and peritonsillar tissue.[1] Usually this infection is a pharyngitis (which occurred in 87.1% of patients as reported by a literature review[2]), and can be preceded by infectious mononucleosis as reported in several cases.[1] It can also be initiated by infections of the ear, mastoid bone, sinuses, or saliva glands.[citation needed]