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St. Louis encephalomyelitis in Hermosillo, Sonora, Mexico
Bulletin of the Pan American Health Organization
|January 1, 1975
Summary
An outbreak of St. Louis encephalitis (SLE) occurred in Mexico, a rare event. This study details the epidemic
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- St. Louis encephalitis (SLE) is a mosquito-borne viral illness.
- Previous outbreaks in Mexico have been infrequent.
- Understanding regional epidemiology is crucial for public health preparedness.
Purpose of the Study:
- To document and characterize a recent epidemic of St. Louis encephalitis in northwestern Mexico.
- To investigate the clinical and epidemiological features of the outbreak.
- To confirm the presence of SLE through serological testing.
Main Methods:
- Clinical case identification and hospitalization in Hermosillo, Sonora.
- Demographic and clinical data collection (symptoms, age, sex).
- Serological testing of patient sera for SLE antibodies (HI, CF, neutralization tests).
Main Results:
- 51 hospitalized cases with typical SLE symptoms over an 8-week period.
- Positive SLE antibody tests and significant titer rises in paired sera.
- Case-fatality rate of 20%; 69% of patients were under 16; affected low-income districts.
Conclusions:
- This report confirms a significant St. Louis encephalitis epidemic in Hermosillo, Mexico.
- The outbreak highlights the potential for SLE in the region, particularly affecting vulnerable populations.
- Further surveillance and vector control are recommended to prevent future occurrences.