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A total of 1,179 patients, comprising 737 males and 442 females, with acute ulcerative gingivitis presented at the Stomatological Clinic in Prague during the decade 1958–1967. The relationship between age and season and the incidence of acute ulcerative gingivitis was studied in these subjects. The highest incidence was in females between 16 and 17 years of age and in males 17 to 22 years of age. The incidence in all subjects 15 to 19 years of age was equivalent to 8.3 persons per10,000 inhabitants. The corresponding figures for the age ranges 20–24 and 25–29 were 4.8 and 2.1 respectively. There were three seasonal peaks in incidence. The highest occurred in September and October, the next highest in December and January and the third was in June. The disease was often associated with the common cold.

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