人蛔虫の型質的分類ならびにその宿主血液型との関係について(第1報)

In order to study the relationship between the types of Ascaris lumbricoides and the blood types of human hosts, the following tests were carried out: 1) The absorption tests for the normal human anti A and B agglutinin using the powder of 44 specimens of Ascaris. 2) The absorption tests for the anti A(Ⅳ), anti B(Ⅱ) B(Ⅲ) and anti B(Ⅲ) agglutinin using the powder of 54 specimens of Ascaris which were taken from 8 patients with known blood types. 3) The agglutinin inhibition test for the anti A(Ⅳ) agglutinin using the water extracts of each of those Ascaris specimens. 4) The precipitin test for the anti O(Ⅲ) precipitin using water extracts which were prepared from the powdered Ascaris. The results obtained from the above mentioned tests are as follows: 1) Ascaris lumbricoides could be divided into two groups by the presence or absence of A(Ⅳ) substance. 2) B and O(Ⅲ) substances are so widely distributed that it is difficult to classify Ascaris lumbricoides by these type substances. 3) The majority of the round worms parasitic in the hosts whose blood types are A, AB and B seem to have A(Ⅳ) substance, whereas those worms parasitizing O type hosts usually lack A(Ⅳ) substance.