A pregnant woman in Australia has tested positive for the Zika virus after traveling overseas. It's the second such case this week.

Victoria state Health Minister Jill Hennessy told reporters on Friday that the woman was diagnosed with Zika after returning from a country where the mosquito-borne virus is prevalent. She declined to provide any other details about the case, including where the woman had traveled, citing .

Earlier this week, a in Queensland state was also diagnosed with Zika after traveling abroad.

Experts say the risk of Zika spreading across Australia is extremely low. The type of mosquito that carries the virus only lives in the far northeast corner of the country, which is sparsely populated.