036 |
INCIDENCE OF SPUTUM POSITIVE TUBERCULOSIS IN DIFFERENT
EPIDEMIOLOGICAL GROUPS DURING FIVE YEAR FOLLOW UP OF A RURAL POPULATION
IN SOUTH INDIA |
GD Gothi, AK Chakraborty & MJ Jayalakshmi: Indian
J TB 1978, 25, 83-91. |
Out of 56,146 persons without BCG scar examined
at the first survey in 119 villages of Bangalore district (1961-63),
22,468 were subsequently examined 3 times over a period of five
years by tuberculin test, X-ray and sputum at intervals of 1½
years to 2 years. No organized anti-tuberculosis services were provided
in the study area. On the basis of tuberculin status and chest X-ray
interpretations, the population was classified into 6 sub groups
for the study of risk of sputum positive disease viz., Normal X-ray
(N), Inactive Tuberculosis (AB) & Probably Active
Tuberculosis (CD) and each of these into tuberculin positives
and negatives.
The annual incidence of sputum positive disease
observed was 1.45 per thousand among 18,207 eligible persons aged
5 years and more. The incidence of the disease in tuberculin
positive group was 7 times as compared to that among tuberculin
negatives. The incidence rate of bacteriological disease was 0.79
per thousand among X-ray normals (N) of the first survey; it was
3.73 per thousand among persons with inactive tuberculous lesion
and non- tuberculous shadows (AB) and 26.04 per thousand among the
group of persons with active or probably tuberculous shadows (CD).
Of the total incidence cases, 76% were contributed by the tuberculin
positives. The group of active or probably active shadows (CD) contributed
26.6% of the total new cases. The population without any radiological
abnormality (N) contributed 48.2% of the new cases.
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KEY WORDS: INCIDENCE, SPUTUM POSITIVE CASE,
RURAL POPULATION, EPIDEMIOLOGICAL GROUPS, LONGITUDINAL SURVEY |