Dallas County Health and Human Services officials say Tuesday a fourth person has tested positive for Zika virus.
The test was confirmed by the Centers for Disease Control and Prevention (CDC), health officials said.
The patient is a 55-year-old resident of DeSoto who traveled to El Salvador, and the person's symptoms have since resolved, according to DCHHS.
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Last week, the Tarrant County Public Health Department confirmed the first imported case of Zika virus in that county.
The most common symptoms of Zika virus are fever, rash, joint pain, and conjunctivitis (red eyes). The illness is usually mild with symptoms lasting several days to a week.
While sexual transmission of Zika virus is possible, it is primarily transmitted to people by Aedes species mosquitoes. So far, there are no confirmed reports of Zika transmission by mosquitoes in the United States.
The virus can have far more harmful effects on women who are infected while pregnant. Zika has led to reports of microcephaly in infants ad other "poor pregnancy outcomes," according to the CDC.
DCHHS advises individuals with symptoms to see a healthcare provider if they visited an area where Zika virus is present or had sexual contact with a person who traveled to an area where Zika virus is present.
There is no specific medication available to treat Zika virus and there is not a vaccine. The best way to avoid Zika virus is to avoid mosquito bites and sexual contact with a person who has Zika virus.
- Dress in long sleeves, pants when outside: For extra protection, spray thin clothing with repellent.
- DEET: Make sure this ingredient is in your insect repellent.
- Drain standing water in your yard and neighborhood: Mosquitoes can develop in any water stagnant for more than three days.
It has been recommended in the past that to avoid mosquito bites you should avoid being outdoors during Dusk and Dawn (the 4 Ds). While this is true for mosquitoes that commonly carry the West Nile virus, other types of mosquitoes that are more likely to carry Zika, dengue and chikungunya are active during the day. When outdoors, no matter what time of day, adjust your dress accordingly and wear insect repellent containing DEET, picaridin or oil of lemon eucalyptus as your first line of defense against insect bites.