Zika virus

A person has been infected through sexual contact, according to Dallas County health officials. Previously, experts had warned the virus was spread through mosquito bites.

The organization say it's concerned about a possible link between the mosquito-borne virus and the cluster of children with birth defects from microcephaly.

In 1965, the U.S. faced an epidemic of German measles that, like the Zika outbreak, was linked to birth defects. It changed the way this country talked about abortion.

Our experience with the rubella virus, which can cause miscarriages or serious birth defects if a woman gets infected while pregnant, may help scientists figure out how to combat Zika virus.

The Centers for Disease Control and Prevention and the National Institutes of Health say they're working to combat Zika. Their plans include developing lab tests and a vaccine.

Facing criticism that the World Health Organization has been slow to respond to Zika, Dr. Margaret Chan delivers her first major address on the outbreak.