Mosquito-host interactions during and after an outbreak of equine viral encephalitis in Eastern Panama.
Authors: Navia-Gine Wayra G, Loaiza Jose R, Miller Matthew J
Journal: PloS one
Summary
# Mosquito-host interactions and equine viral encephalitis risk in Panama During and after an outbreak of equine viral encephalitis in eastern Panama, researchers analysed 338 blood meals from 10 mosquito species to understand which animals were being fed upon and whether mosquitoes showed preferences for particular hosts. Using molecular techniques targeting mitochondrial DNA, they identified that domesticated large mammals dominated the mosquito diet in the study area, whilst wild birds and mammals comprised only a minor portion of blood meals, with eight of nine mosquito species demonstrating opportunistic feeding patterns rather than strict host specificity. The analysis revealed that mosquitoes fed on available hosts roughly in proportion to their biomass, suggesting that landscape composition—particularly the prevalence of domestic livestock—significantly shapes vector-host contact rates and therefore disease transmission risk. This has substantial implications for disease management strategies: in regions where large domestic animals represent the dominant biomass, control efforts centred solely on equine vaccination or protection may prove insufficient if multiple mosquito species readily feed across livestock species, creating complex transmission cycles. Understanding local feeding ecology thus becomes critical for predicting outbreak risk and designing effective vector-borne disease interventions in the Neotropics.
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Practical Takeaways
- •In regions where large domestic animals dominate the landscape, mosquito vectors show minimal host preference and will feed on available livestock in proportion to their numbers—proximity management of horses to other livestock may influence encephalitis exposure risk
- •During arboviral outbreaks in the Neotropics, focus vector control efforts on the most abundant mosquito species, as dietary overlap suggests multiple species are likely involved in disease transmission
- •Livestock management and grazing patterns in endemic areas should be considered as part of disease control strategy, as the biomass composition of local animals directly influences mosquito feeding behavior and therefore disease spillover risk
Key Findings
- •10 mosquito species' blood meals were analyzed during and after an equine viral encephalitis outbreak in eastern Panama
- •Large domesticated mammals dominated mosquito blood meals (majority of 338 samples), while wild birds and mammals represented only a small portion
- •Eight of nine mosquito species showed little host specificity and fed on hosts in proportion to their biomass availability
- •High dietary overlap among mosquito species suggests that livestock-dominated landscapes increase vector exposure risk across multiple mosquito species