Depletion of skin bacteria by topical antibiotic treatment accelerates onset of Zika virus disease in mice.
Langendries, L.; Verwimp, S.; Jacobs, S.; Alpizar, Y. A.; Malengier-Devlies, B.; Abdelnabi, R.; Raes, J.; Callewaert, C.; Yshii, L.; Delang, L.
Show abstract
Mosquito-borne flaviviruses have emerged as global health threats due to their rapid spread and high disease burden. The initial site of virus replication is the mosquito biting site in the host skin, yet the role of host skin bacteria remains unclear. Here, we observed accelerated progression of Zika virus (ZIKV)-induced disease in mice with depleted skin bacteria by topical antibiotic treatment prior to ZIKV infection. Increased viral loads in the blood, draining lymph node, spleen and brain of antibiotic-treated mice suggested faster ZIKV dissemination. Flow cytometry revealed increased frequencies of T cells in the lymph nodes, along with enhanced activation of T cells in the brain upon antibiotic treatment. The antibiotic-induced phenotype was rescued by restoring the skin bacteria prior to infection. Our findings demonstrate an increased susceptibility to ZIKV infection in mice with depleted skin microbiomes, suggesting a potential role of skin bacteria in modulating the infection outcome.
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