A comparison was made of the diagnostic value of five immunological tests-complement fixation (CF), latex agglutination (LA), bentonite flocculation (BF), passive haemagglutination (PHA), and intradermal (ID)-in patients operated on for pulmonary echinococcosis. The sensitivity of all five tests was significantly lower in the patients with pulmonary echinococcosis than in a comparable group with liver echinococcosis. Some 252 patients with miscellaneous nonhydatid diseases and parasitic infections were also tested; nonspecific reactions were highest in the ID and CF tests and lowest in the LA and BF tests. None of the serological tests was significantly more sensitive than the others, although the CF test was somewhat less sensitive and therefore probably has the least diagnostic value in pulmonary echinococcosis. The ID test showed a significantly higher sensitivity than any of the serological tests. The difficulties encountered in the immunodiagnosis of pulmonary hydatid disease are discussed and it is recommended that at least two serological methods (PHA and either LA or BF) and the ID test should be used in each case.
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