Present Status of Tuberculosis in the Inhab itants of Tokunoshima-Town:3rd Report: Results of bacteriological examination

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Except infants, bacteriological examinationwas made on all persons, to whom precise examinations were required according to the resultsof miniature X-ray findings and tuberculin reaction. Among the specimens examined, about 15 %were sputa and the remained 85 % were laryngeal swabs. These specimens were kept in anicebox and each of them was cultured on threeOgawa's egg slants after pretreatment with 4 %NaOH on the same day. Then, the slants werekept in an incubator at 37°C and observed for8 weeks. All of the acid-fast bacilli, which developedlater than one week of incubation, were investigated on their biological characteristics precisely.Drug resistance was tested by the indirect testmethod on the strains which were identified ashuman type tubercle bacilli. The results obtained were as follows; 1) Bacteriological examination was made on827 cases, which comprises about 85 % of thecases requiring precise examination and in 67cases tubercle bacilli were positive. The proportion of the cases who received bacteriologicalexamination was 30% of the pulmonary pathology and 75.8 % of the cases requiring medicalinstruction, respectively. 2) That the proportion of sputum was only15.7 % of total specimens examined would indicate the indispensability of laryngeal swab examination for the bacteriological examination intuberculosis mass survey. 3) Positive rate in the bacteriological examination in every type of pulmonary tuberculosiswas 92.2 % in Type I, 30.5 % in Type II, 12.6 % in Type III, 5.9 % in Type IV and 1.1%in Tipe V, respectively. On the other hand, in no case of extrapulmonary tuberculosis andof that with or without any X-ray findingsother than tuberculosis was bacilli positive. The fact that bacilli positive cases were foundalso in Type TV and y of pulmonary tuberculo sis, shows the difficulties in reading of X-rayfilms and the necessity of paying caution in determining each type of pulmonary tuberculosis.From these results, it is clear that bacteriological examination is necessary at least for allcases of Type IV and some of Type V of pulmonary tuberculosis. 4) Among the strains of tubercle bacilli isolated 28.1 % were drug resistant and the majority of them were streptomycin resistant. However, no case was found to be infected withresistant tubercle bacilli. 5) Contamination of saprophytic bacilli ormolds were found in 1.6 % of total slants used, 6) Ten strains among the acid-fast bacilliother than human type tubercle bacilli wereexamined and the results revealed that one washuman type-like, seven were non-photochromogen-like and the remained two were saprophyticmycobacteria.
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Present Status of Tuberculosis in the Inhab itants of Tokunoshima-Town:3rd Report: Results of bacteriological examination

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