lizzy morales, aouston mother, contracted zika on a christmas visit to el salvador. >> you could see bumps in my lips. my ears. you have no strength, no energy. like to do anything. not to even sit down. all you want to do is lay down and sleep. >> reporter: she wasn't pregnant. her symptoms subsided. since the virus is believed to leave your blood when you recover any future pregnancies should be fine. today florida governor rick scott declared a public health emergency in four counties where people have been diagnosed with zika. red cross is telling donors to hold off giving for 28 days if they've been somewhere that has zika transmission. yesterday the first confirmed case of zika transmission in the u.s. spread not by mosquito but through sexual contact with someone infected by the virus. dr. peter hotez, a tropical disease scientist, said blood transfusions and sexual contact should be the least of our concerns. >> the case of sexual transmission is a bit of a red herring. our efforts need to be focused on preventing mosquito bites. >> reporter: hotez says he's very worried abou