Outbreak of Dengue and Chikungunya Fevers in Madagascar
Author Information
Author(s): Ratsitorahina Mahery, Harisoa Julie, Ratovonjato Jocelyn, Biacabe Sophie, Reynes Jean-Marc, Zeller Hervé, Raoelina Yolande, Talarmin Antoine, Richard Vincent, Soares Jean Louis
Primary Institution: Institut Pasteur de Madagascar
Conclusion
An outbreak caused by both chikungunya and dengue viruses occurred in Madagascar, affecting a significant portion of the population.
Supporting Evidence
- 67.5% of residents reported dengue-like symptoms during the outbreak.
- Dengue virus and chikungunya virus were detected in 38 of 55 patients sampled.
- Co-infections were found in 10 patients.
- Aedes albopictus was the only mosquito vector identified.
- The mean age of participants was 24.9 years.
- 72.7% of participants reported more than one previous episode of fever.
- High attack rates were observed among all age groups.
Takeaway
In Madagascar, many people got sick from two viruses called dengue and chikungunya, which spread through mosquito bites.
Methodology
A retrospective cross-sectional study was conducted with serum samples from patients and interviews of residents to assess the outbreak.
Potential Biases
Underreporting of cases, especially in children, may have affected the prevalence estimates.
Limitations
The study was based on clinical observations alone, which may not fully capture the extent of the outbreak.
Participant Demographics
The mean age of participants was 24.9 years, with a sex ratio of 0.87.
Statistical Information
P-Value
p<0.01
Confidence Interval
95% CI 24.4–25.4
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website