McCormick J B, Hayes P, Feldman R
JAMA. 1976 Aug 30;236(9):1039-41.
Following a picnic, nearly half of the persons who attended became ill. Sixty-three of 139 throat cultures were positive for group A beta-hemolytic streptococci. Forty-seven of the positive cultures were available for typing, 34 of which harbored the epidemic strain, group A beta-hemolytic Streptococcus type T-3/13/B3264. This contrasted with two of 204 controls who had not attended, but harbored the epidemic strain. Food preferences and illness rates implicated the potato salad, and from it the epidemic strain was isolated. The attack rate and case-to-infection ratio among those who attended the picnic was significantly greater for persons over 10 years of age. Prompt institution of chemoprophylaxis could possibly have prevented at least 50% of the cases.
一次野餐过后，近半数参加者生病。139份咽喉培养物中有63份A组β溶血性链球菌呈阳性。其中47份阳性培养物可用于分型，34份含有流行菌株，即A组β溶血性T-3/13/B3264型链球菌。这与204名未参加野餐但携带流行菌株的对照者中的两人形成对比。食物偏好和发病率表明土豆沙拉是致病原因，且从土豆沙拉中分离出了流行菌株。野餐参加者中10岁以上人群的发病率和感染比显著更高。及时进行化学预防可能至少能预防50%的病例。
