The incidence of community-acquired acute bacterial sialadenitis is unknown. However, 0.01% to 0.02% of patients admitted to hospital and 0.02% to 0.04% of post-surgical patients develop this condition.[4][5] Although the majority of patients are older people, this condition may also affect young children and, rarely, neonates; particularly those born premature.[6][7][8][9] Chronic recurrent sialadenitis occurs 10 times more frequently in adults than in children, with an age range of 40 to 60 years in adults and 4 months to 15 years in children.[10] The incidence and prevalence of chronic sclerosing sialadenitis is unknown but appears to be much lower than acute or chronic recurrent sialadenitis. Sjogren's syndrome has a population prevalence of between 0.5% and 1.56%, with a peak age between 50 and 60 years and a high predilection for women (ratio 9:1).[11][12][13][14] Most of these patients will present with an associated autoimmune sialadenitis.[15][16]

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