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Published on: December 9, 2015
Seasonality in various forms of tuberculosis
1National Hospital Organization Tokyo Hospital, Kiyose City, Japan. nagayama@tokyo.hosp.go.jp
Summary
Tuberculosis (TB) notification seasonality varies by TB type in Japan. Most TB cases were lowest in winter, but specific forms like childhood TB peaked in spring, indicating distinct clinical development patterns.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Tuberculosis (TB) remains a significant global health challenge.
- Understanding temporal patterns in TB notification is crucial for effective public health strategies.
Purpose of the Study:
- To investigate the seasonal variations in the notification of different forms of tuberculosis in Japan.
- To compare seasonal trends across various TB subtypes.
Main Methods:
- Descriptive analysis of newly notified TB cases over a five-year period (1998, 2000-2003).
- Examination of notification data by month to identify seasonal patterns.
- Comparative analysis of seasonality among different TB forms.
Main Results:
- Overall TB notifications were lowest from November to January.
- Childhood TB and pleural TB showed peak notifications in spring (March-May) and spring to early summer (April-June), respectively.
- Sputum smear-positive pulmonary TB (PTB) in young individuals peaked in spring, while in the elderly, it peaked in late spring to summer (May-August). Lymph node TB also exhibited a summer peak.
Conclusions:
- The seasonality of TB notification is distinct for various forms of the disease.
- These seasonal differences likely reflect variations in the timing of clinical manifestation for different TB disease types, including primary and post-primary TB.
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