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[INCREASE IN THE NUMBER OF INFANTS WITH KOCH PHENOMENON AFTER BCG VACCINATION]

Kunihiko Ito

    Kekkaku : [Tuberculosis]
    |October 20, 2015
    PubMed

    Insights

    The timing of BCG vaccination was changed, leading to a doubling of infants diagnosed with latent tuberculosis infection (LTBI), likely due to Koch phenomenon. Further analysis is needed to confirm this trend.

    Area of Science:

    • Pediatric infectious diseases
    • Vaccinology
    • Tuberculosis epidemiology

    Context:

    • BCG vaccination is a primary method for preventing tuberculosis in infants.
    • Changes in vaccination schedules can impact disease incidence and related phenomena.
    • The Koch phenomenon, a localized inflammatory reaction, can occur post-BCG vaccination.

    Purpose:

    • To evaluate the impact of a modified BCG vaccination schedule on the incidence of Koch phenomenon in infants.
    • To analyze trends in latent tuberculosis infection (LTBI) and active tuberculosis diagnoses in infants before and after the vaccination timing change.

    Summary:

    • Analysis of Japanese tuberculosis surveillance data from infants (≤1 year) before and after May 2012 revealed no increase in active tuberculosis cases.
    • A significant doubling of latent tuberculosis infection (LTBI) diagnoses was observed, from 45 to 90 cases.
    • This increase in LTBI is presumed to be associated with a higher incidence of Koch phenomenon following the altered BCG vaccination timing.

    Impact:

    • The findings suggest a potential increase in Koch phenomenon among infants after the BCG vaccination schedule modification.
    • Highlights the need for further investigation into the relationship between vaccination timing and post-vaccination inflammatory responses.
    • Informs public health strategies regarding infant tuberculosis prevention and vaccination protocols.
    Abstract

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