Dear Doctor: We live on a lake in Minnesota where mosquitos are a way of life. Now that Zika has come to the United States, are we at risk when the weather heats up this spring?

Dear Reader: The spread of the Zika virus to the U.S. is cause for concern but not alarm. It's a complex issue, so the best way to answer your question is to lay out the basics.

You're correct that Zika has been locally transmitted in two areas in South Florida. However, health officials say that a wide outbreak is unlikely. The virus, which is related to dengue, West Nile virus and yellow fever, is transmitted by the female mosquito of the Aedes genus.

Those who are at greatest risk are pregnant women. Zika can cause a range of birth defects, including microcephaly, a condition in which babies are born with abnormally small heads. Pregnant women are advised to stay away from areas where Zika is spreading

Because Zika is known to be sexually transmitted, men need to take precautions as well. The Zika virus can remain active in semen for up to six months, so the Centers for Disease Control and Prevention (CDC) advise men who may have been infected to use condoms.

To best protect yourself from Zika: