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. Although the majority of patients are older people, this condition may also affect young children and, rarely, neonates; particularly those born premature. 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. 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). Most of these patients will present with an associated autoimmune sialadenitis.
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