The Pentagon says 33 U.S. service members, including one who is pregnant, have contracted the Zika virus overseas, NBC News reported.
Officials would not say where the service members were posted, but a defense official said all recently traveled to areas where Zika is prevalent. No details about the pregnant service member were provided. Six dependents of military personnel have also been infected, a Pentagon source told NBC News.
The Military Times reported that the Department of Defense started tracking the mosquito-horne illness earlier this year.
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"(We are actively testing mosquitoes) as part of our ongoing integrated vector control and surveillance programs at bases and installations," Pentagon spokesman Air Force Maj. Benjamin Sakrisson told The Military Times.