A case with tropical eosinophilia was reported; the cause was suspected to be an infection of Dirofilaria immitis (D.i.). The case was a 31 year-old male student studying anthropology. He had stayed in Malaysia for approximately one year beginning in August, 1978, living with the natives in a jungle, where there were many dogs and mosquitoes. The patient had begun to suffer from cough with stridor and dyspnea before dawn, begining in February, 1979. Even after he returned to Japan in August of 1979, the patient's symptoms had continued, and he visited our clinic in April, 1980. Several inguinal lymphnodes were palpated bilaterally. Peripheral blood eosinophile count was 3655/mm^3, IgE was 7850ng/ml, precipitation test in agarose gel was positive against antigens from D.i., Toxocara canis and Asaris suum, complement fixation test, ELISA and RAST count against D.i. antigen were >1:160 (control<1:10), >1:1280 (control<1:40) and 331.5 (control 33.9), respectively. No abnormality was seen in chest X-ray film. The attacks of wheezing and dyspnea were controlled satisfactorily by β_2-stimulant. Within several days after the administration of diethylcarbamazine citrate in June, the patient recovered completely without β_2-stimulant. Eosinophile count decreased to 700, and antibody titer for complement fixation test decreased to 1:80 in December, 1980.
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