Journal
EMERGING INFECTIOUS DISEASES
Volume 23, Issue 7, Pages 1110-1117Publisher
CENTERS DISEASE CONTROL & PREVENTION
DOI: 10.3201/eid2307.161633
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Funding
- National Institutes of Health grant [C06-RR-17715]
- Centers for Disease Control and Prevention Vector-borne Disease Regional Center of Excellence, CDC [CK17-005]
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1359413] Funding Source: National Science Foundation
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In the Western Hemisphere, Zika virus is thought to be transmitted primarily by Aedes aegypti mosquitoes. To determine the extent to which Ae. albopictus mosquitoes from the United States are capable of transmitting Zika virus and the influence of virus dose, virus strain, and mosquito species on vector competence, we evaluated multiple doses of representative Zika virus strains in Ae. aegypti and Ae. albopictus mosquitoes. Virus preparation (fresh vs. frozen) significantly affected virus infectivity in mosquitoes. We calculated 50% infectious doses to be 6.1-7.5 log(10) PFU/mL; minimum infective dose was 4.2 log(10) PFU/mL. Ae. albopictus mosquitoes were more susceptible to infection than Ae. aegypti mosquitoes, but transmission efficiency was higher for Ae. aegypti mosquitoes, indicating a transmission barrier in Ae. albopictus mosquitoes. Results suggest that, although Zika virus transmission is relatively inefficient overall and dependent on virus strain and mosquito species, Ae. albopictus mosquitoes could become major vectors in the Americas.
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