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1970～1974年8月(经历4个流行季节),冈比亚Foni地区发生炭疽散发病人448例。该地区位于冈比亚河南岸,大约400多平方英里,居民28500人,从事畜牧和农业。至少45%的村庄发病,其中有二个小村庄发病率较高(分别为4%和11%)。病人几乎都发生于干季(11月～5月),持续至雨季的开始(6月～8月),以后则很少。血清学调查证明,有些无炭疽病史者血清中亦含有抗体,但他们皆为密切接触者,表明有亚临床型感染。抗体消失都很快,有些持续1年。次年再次患炭疽的儿童于第二次发病后不久迅即采血,未发现抗体存在。
From 1970 to August 1974 (four popular seasons), 448 anthrax patients were found in Foni, Gambia. The area is located on the southern bank of the Gambia River, about 400 square miles and has a population of 28,500 inhabitants in livestock and agriculture. At least 45% of villages have morbidity, with two of the smaller villages having a higher prevalence (4% and 11% respectively). Almost all patients occurred in the dry season (November to May), until the beginning of the monsoon season (June to August), but few thereafter. Serological surveys have shown that some anthrax-free sera also contain antibodies in their sera, but all are close contacts indicating subclinical infection. Antibodies disappear quickly, some lasting 1 year. In the following year, children who suffered from anthrax again failed to see the presence of antibodies immediately after the second episode.