Most strains of Listeria monocytogenes isolated from human listeriosis in Japan so far have been identified as type 1 or type 4b. Only one case, from which type 4d strain isolated, was reported in 1974 by T. Nagai, one of the suthors.
A strain was isolated from the arteria and venous blood of a sepsis and meningitis patient (67 years old, male) in Toranomon Hospital Tokyo, August of 1976, and this strain was named as “Matsuya strain”.
Its morphological findings and biochemical properties were identical with those of Listeria monocytogenes. By serological tests, i.e. by cross agglutination test and absorption test using immune serum of standard strain (type 1 a, 1 b and 2) and Matsuya strain, it was identified as Listeria monocytogenes type 2.
Apart from this case, type 2 strain of Listeria monocytogenes was isolated from the blood of a sepsis patient (67 years old, male) in Niigata Prefecture, June of 1976.
The total number of human listeriosis cases in Japan counts 144 (form 1958 to 1976).
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