FREQUENCY OF ISOLATION AND SPECIES OF‘ATYPICAL’MYCOBACTERIA ISOLATED IN JAPANESE NATIONAL CHEST HOSPITALS LOCATING IN VARIOUS PLACES
1976 Volume 51 Issue 3 Pages 67-70
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1976 Volume 51 Issue 3 Pages 67-70
Frequency of isolation of mycobacteria other than tubercle bacilli (‘atypical’ mycobacteria) and their species were studied in national chest hospitals locating in various places in 1973 and 1974. The results were almost the same to those obtained by the preceding study in the year 1971-1972 (Kekkaku 48: 203-211, 1973).
Frequency of ‘atypical’ mycobacteria among all mycobacteria, including tubercle bacilli, was 5. 3% (Table 1). The frequency was higher in the hospitals locating in the South Pacific coast of the Honshu island, which corresponds to principal industrial area of this country, and the frequency was lower in the hospitals locating in North Japan and Shikoku island (Table 1).
Variation of the frequency according to the season was not observed (Table 2).
The most frequently isolated species was M. avium-intracellulare complex (89. 6%) (Table 3).
The frequency and the species between the preceding study (year 1971-1972) and the present study were statistically not significantly (Tables 4 and 5).
