Abstract. We report the first apparent case of a splenectomized individual who developed severe trypanosomiasis with central nervous system involvement. The patient was a 41-year-old man who participated in an east African safari. Upon his return to the United States, the patient presented with an infection with Trypanosoma brucei rhodesiense that was treated successfully with suramin and melarsoprol. The onset of symptoms, laboratory studies, and disease progression did not differ from previously reported cases in the literature. The role of the spleen in trypanosomiasis is not well understood and the few reports available describe only animal models. This report suggests that asplenia had no apparent effect on the onset of symptoms and overall severity of illness. Further studies are necessary to ultimately define the role of the spleen in trypanosomiasis.The acute form of African trypanosomiasis caused by Trypanosoma brucei rhodesiense occurs predominantly in east Africa, whereas the chronic form caused by T. b. gambiense occurs mainly in west and central Africa. Transmission is by the tsetse fly bite. 1,2 The incubation period for acute trypanosomiasis (T. brucei rhodesiense) ranges from 6 to 28 days. Infected travelers frequently become ill during their trips or shortly after returning. 3 Malaria also occurs commonly in Africa and the severity of presentation can be exacerbated by splenectomy. 4 We report a case of infection with T. b. rhodesiense with central nervous system involvement in a splenectomized American traveler and discuss the treatment of trypanosomiasis and the potential impact of asplenia.
CASE REPORTThe case was a 41-year-old private investigator (height ϭ 198 cm, weight ϭ 92 kg) who recently returned from an African safari. His medical history included splenectomy in 1977 for Hodgkin's disease now in remission, as well as mild asthma, migraine headaches, hypothyroidism, and occasional sinusitis.He entered Africa on September 29, 1996 and hunted in Tanzania for cape buffalo where he sustained several painful tsetse fly bites. One bite on his left arm became moderately swollen several days later.He returned to the United States on October 5, 1996. Five days later, he developed weakness, headache, fever, chills, and sweats. Anorexia and weight loss of approximately 5 kg was noted. A trial of trimethoprim/sulfamethoxazole for presumed sinusitis failed. His temperature reached 104.4ЊF (40.2ЊC) and he became progressively lethargic and confused. On October 15, 1996, 10 days after his return to the United States, thick and thin blood smears revealed numerous trypanosomes.His admitting examination was remarkable for asthenia, fever, and a toxic appearance with moderate jaundice. On the left arm near the elbow there was a 3-cm, round, scaly, erythematous lesion with a small area of fluctuance in the center. Other healing insect bites were also noted. Regional lymphadenopathy was found in the left epitrochlear area.Other laboratory test abnormalities (normal ranges in parentheses) included a platele...