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Leptospirosis in the Philippines.

V Basaca-Sevilla, J H Cross, E Pastrana

    The Southeast Asian Journal of Tropical Medicine and Public Health
    |March 1, 1986
    PubMed
    Summary

    Leptospirosis seroprevalence in a Philippine penal farm decreased significantly over time, from 31% during an outbreak to 2.29% in a second follow-up, indicating effective control measures. This study tracked Leptospira infections in a high-risk population.

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    Area of Science:

    • Epidemiology
    • Infectious Diseases
    • Public Health

    Background:

    • Leptospirosis, a zoonotic disease, has been documented in the Philippines since 1932.
    • Sporadic cases and outbreaks have been recorded, necessitating ongoing surveillance.

    Purpose of the Study:

    • To investigate the seroprevalence of leptospirosis in a penal farm population in Sablayan, Mindoro.
    • To monitor changes in Leptospira antibody reactivity over time following an outbreak.

    Main Methods:

    • Serological examination using antigen pools to detect Leptospira antibodies.
    • Follow-up studies conducted at intervals over several years to assess seroreactivity trends.
    • Comparison of reactivity between symptomatic individuals, asymptomatic residents, and external populations.

    Main Results:

    • During an outbreak, 31% of symptomatic individuals reacted to antigen pools, with a decrease to 9.07% in the first follow-up and 2.29% in the second.
    • Leptospira interrogans serovar pyrogenes and Leptospira interrogans serovar autumnalis were identified as significant serovars.
    • Residents outside the penal farm and other sampled areas showed no significant reactivity, suggesting localized transmission.

    Conclusions:

    • Longitudinal monitoring revealed a declining trend in leptospirosis seroreactivity within the penal farm.
    • The findings suggest that interventions implemented may have been effective in controlling the spread of leptospirosis.
    • Targeted surveillance in high-risk environments like penal colonies is crucial for managing infectious diseases.

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