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Free Content Seasonality in various forms of tuberculosis

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SETTING: Newly notified cases of tuberculosis (TB) for 5 years (1998 and 2000–2003) in Japan.

OBJECTIVE: To study the seasonality of notification for various forms of TB.

DESIGN: Descriptive analyses of newly notified cases by month of the year. Seasonal variations were compared among various forms of TB.

RESULTS: In almost all the forms of TB examined, the numbers of newly notified TB cases were the lowest from November to January. For childhood and pleural TB, the numbers of cases of TB were highest from March to May (spring) and from April to June (spring to early summer), respectively. For sputum smear-positive pulmonary tuberculosis (PTB) in the young, the number of cases was also highest from March to May. For lymph node TB (except mediastinal) and sputum smear-positive PTB in the elderly (aged ≥50 years), the numbers of cases were highest from May to July (late spring to summer) and from June to August (summer), respectively.

CONCLUSION: The seasonality of TB notification differs for the various forms of TB, which may reflect differences in the seasonality of clinical development of different types of TB disease such as primary, early and late post-primary TB.
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Keywords: immunity; post-primary; primary; seasonality; tuberculosis

Document Type: Regular Paper

Affiliations: 1: National Hospital Organization Tokyo Hospital, Tokyo, Japan 2: Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association (JATA), Tokyo, Japan

Publication date: 2006-10-01

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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