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Pune Zika Warning: Virus Evolves, Future Risk Looms
29 Sep
Summary
- Pune mosquitoes show high Zika RNA positivity in outbreak areas.
- Virus strains in Pune carry mutations potentially aiding transmission.
- No microcephaly-linked mutations found in Pune's Zika strains.
A National Institute of Virology study has issued a warning regarding Pune's Zika virus situation following the 2024 monsoon outbreak. Researchers identified a high density of Aedes aegypti mosquitoes and detected transmission-enhancing mutations within the circulating Zika virus strains. These factors suggest a potential for increased cases in the future.
The study, conducted between June and September 2024, revealed that 26.5% of Aedes aegypti mosquito pools collected from neighborhoods with reported cases tested positive for Zika RNA. While this positivity rate was confined to outbreak-affected areas, it highlights a significant viral presence. Genomic analysis confirmed the virus strains belong to the Asian lineage and possess mutations, such as E-V473M, which may contribute to more efficient spread.
Fortunately, the study did not detect mutations associated with severe fetal outcomes, like microcephaly, which were observed during outbreaks in the Americas. Pune recorded 109 Zika cases in 2024, including 45 pregnant women. The Pune Municipal Corporation has reported that all monitored pregnant women experienced normal fetal development and no congenital deformities.
Experts emphasize the need for continuous surveillance of mosquito populations and viral genomes. This ongoing monitoring is crucial for tracking evolving Zika strains and identifying any mutations that could elevate the risk of future outbreaks, ensuring public health preparedness.
