TY - JOUR
T1 - Effect of chikungunya, Mayaro and Una virus coinfection on vector competence of Aedes aegypti mosquitoes
AU - Visser, Tessa M.
AU - Wang, Haidong D.
AU - Abbo, Sandra R.
AU - Vogels, Chantal B.F.
AU - Koenraadt, Constantianus J.M.
AU - Pijlman, Gorben P.
PY - 2025/6
Y1 - 2025/6
N2 - The mosquito-borne alphaviruses chikungunya (CHIKV), Mayaro (MAYV) and the lesser known Una (UNAV) are currently co-circulating in Latin America, sharing their geographical and ecological niche with the Aedes aegypti mosquito. The sylvatic MAYV cycle and the unknown cycle of UNAV could possibly spill over and become urban transmission cycles involving Ae. aegypti. Despite their potential impact on public health, we know little about arboviral coinfections in humans, animals or mosquitoes. Especially the effect of coinfections on transmission by Ae. aegypti mosquitoes is understudied. We investigated the vector competence of Ae. aegypti for single, dual, and triple exposures with UNAV, MAYV and CHIKV, provided simultaneously in an infectious blood meal. Mosquitoes were incubated for ten days at 28 °C and 70 % humidity. After RNA extractions from mosquito bodies and saliva, the presence and relative quantity of each virus in coinfected mosquitoes was determined. We show that Ae. aegypti can become infected with all three viruses simultaneously, and transmit at least two alphaviruses in a single mosquito bite after dual or triple infection. Additionally, we show for the first time that Ae. aegypti is a competent vector for UNAV, and that dual infections do not influence vector competence. In triple coinfections, however, the total viral load carried by mosquitoes decreases, lowering the transmission potential. Understanding how coinfections affect arbovirus biology and transmission of is essential for assessing public health risks. However, emerging Ae. aegypti-vectored arboviruses and coinfections are a One Health concern, as ecological and environmental changes will increasingly drive the geographic distributions of viruses, vectors, and hosts in the future.
AB - The mosquito-borne alphaviruses chikungunya (CHIKV), Mayaro (MAYV) and the lesser known Una (UNAV) are currently co-circulating in Latin America, sharing their geographical and ecological niche with the Aedes aegypti mosquito. The sylvatic MAYV cycle and the unknown cycle of UNAV could possibly spill over and become urban transmission cycles involving Ae. aegypti. Despite their potential impact on public health, we know little about arboviral coinfections in humans, animals or mosquitoes. Especially the effect of coinfections on transmission by Ae. aegypti mosquitoes is understudied. We investigated the vector competence of Ae. aegypti for single, dual, and triple exposures with UNAV, MAYV and CHIKV, provided simultaneously in an infectious blood meal. Mosquitoes were incubated for ten days at 28 °C and 70 % humidity. After RNA extractions from mosquito bodies and saliva, the presence and relative quantity of each virus in coinfected mosquitoes was determined. We show that Ae. aegypti can become infected with all three viruses simultaneously, and transmit at least two alphaviruses in a single mosquito bite after dual or triple infection. Additionally, we show for the first time that Ae. aegypti is a competent vector for UNAV, and that dual infections do not influence vector competence. In triple coinfections, however, the total viral load carried by mosquitoes decreases, lowering the transmission potential. Understanding how coinfections affect arbovirus biology and transmission of is essential for assessing public health risks. However, emerging Ae. aegypti-vectored arboviruses and coinfections are a One Health concern, as ecological and environmental changes will increasingly drive the geographic distributions of viruses, vectors, and hosts in the future.
KW - Aedes aegypti
KW - Alphavirus
KW - Chikungunya virus
KW - Coinfection
KW - Mayaro virus
KW - Una virus
KW - Vector competence
U2 - 10.1016/j.onehlt.2025.100991
DO - 10.1016/j.onehlt.2025.100991
M3 - Article
AN - SCOPUS:85217253151
SN - 2352-7714
VL - 20
JO - One Health
JF - One Health
M1 - 100991
ER -
