The Oakland County Health Department said it is testing two dozen residents in the county who could be infected by the Zika virus.
This comes just two days after state health officials said the first case of Zika has been confirmed in Michigan. The woman from Ingham County recently visited a country where the Zika virus is being transmitted.
On Friday, the Associated Press reported Zika has been confirmed in nine pregnant women in the United States. All got the virus overseas, and three babies have been born. One was born with a brain defect.
There is no specific treatment or vaccine for Zika. The virus is related to dengue, and scientists have struggled for years to develop a dengue vaccine; the first such shot made by Sanofi Pasteur was licensed last year in Brazil.
Last month, the World Health Organization said the virus is "spreading explosively" in the Americas and the CDC said there are now 107 cases of travel-associated Zika confirmed in the United States.
