A study examined effects of transient somatic infection with two Wolbachia bacterial strains—wAlbB and wMel—on Sindbis virus, O’nyong-nyong virus, and Mayaro virus infections in Aedes aegypti mosquitoes. Researchers infected adult female A aegypti mosquitoes with either 0·1 μL of Wolbachia (1010 bacteria per mL) or cell lysate control, followed by infection with Sindbis virus or O’nyong-nyong virus after 7 days, or Mayaro virus after 8 days. Sindbis virus infection rates (the proportion of infected mosquitoes with virus-positive bodies) were significantly enhanced on day 7 in both wAlbB and wMel mosquitoes compared with control mosquitoes, although viral transmission rates (the proportion of mosquitoes with virus-positive legs and saliva) did not differ from controls.