Abstract
Pasteurella pseudotuberculosis has been considered a widespread animal pathogen for many years, but only within the last decade has its capacity to cause human disease been recognized. Two forms of human disease have been established—acute septicemia and mesenteric lymphadenitis. Because mesenteric adenitis is frequently indistinguishable from acute appendicitis, blood serum was obtained from 66 consecutive patients who underwent operation for appendicitis and was examined for agglutinins to seven serotype strains of P. pseudotuberculosis. Agglutinins were obtained in 21.2% of this series. Titres of over 1/100 were found in three of three cases of mesenteric lymphadenitis, one of 11 with no apparent disease, and one of 46 with appendicitis. P. pseudotuberculosis was isolated from a lymph node in the latter case. Two to four follow-up samples of sera in each of these five cases had increasing and then decreasing titres, indicative of active disease. Titres of 1/15 or less were found in five of the cases of appendicitis, in one case of salpingitis, and in three with no apparent disease. The occurrence of these nine cases with low titres may be indicative of previous contact with the organism.
Human infection with P. pseudotuberculosis is not unusual in the Edmonton region and is responsible for at least some cases of mesenteric lymphadenitis.
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