What is Zika Virus disease (Zika)?
Zika is a disease caused by Zika virus that is spread to people primarily through the bite of an infected Aedes species mosquito. The most common symptoms of Zika are fever, rash, joint pain, and conjunctivitis (red eyes). The illness is usually mild with symptoms lasting for several days to a week.
What are the symptoms of Zika?
About one in five people infected with Zika will get sick. For people who get sick, the illness is usually mild. For this reason, many people might not realize they have been infected.
The most common symptoms of Zika virus disease are fever, rash, joint pain, or conjunctivitis (red eyes). Symptoms typically begin 2 to 7 days after being bitten by an infected mosquito.
How is Zika transmitted?
Zika is primarily transmitted through the bite of infected Aedes mosquitoes. It can also be transmitted from a pregnant mother to her baby during pregnancy or around the time of birth. We do not know how often Zika is transmitted from mother to baby during pregnancy or around the time of birth.
Who is at risk of being infected?
Anyone who is living in or traveling to an area where Zika virus is found who has not already been infected with Zika virus is at risk for infection, including pregnant women.
What countries have Zika?
Specific areas where Zika virus transmission is ongoing are often difficult to determine and are likely to change over time. Please visit the CDC Travelers' Health site for the most updated information.
What can people do to prevent becoming infected with Zika?
There is no vaccine to prevent Zika. The best way to prevent diseases spread by mosquitoes is to avoid being bitten. Protect yourself and your family from mosquito bites. Here’s how:
- Wear long-sleeved shirts and long pants.
- Stay in places with air conditioning or that use window and door screens to keep mosquitoes outside.
- Use Environmental Protection Agency (EPA)-registered insect repellents. All EPA-registered insect repellents are evaluated for safety and effectiveness.
- Always follow the product label instructions.
- Reapply insect repellent every few hours.
- Do not spray repellent on the skin under clothing.
- If you are also using sunscreen, apply sunscreen before applying insect repellent.
- If you have a baby or child:
- Do not use insect repellent on babies younger than 2 months of age.
- Dress your child in clothing that covers arms and legs, or
- Cover crib, stroller, and baby carrier with mosquito netting.
- Do not apply insect repellent onto a child’s hands, eyes, mouth, and cut or irritated skin.
- Adults: Spray insect repellent onto your hands and then apply to a child’s face.
- Treat clothing and gear with permethrin or purchase permethrin-treated items.
- Treated clothing remains protective after multiple washings. See product information to learn how long the protection will last.
- If treating items yourself, follow the product instructions carefully.
- Do NOT use permethrin products directly on skin. They are intended to treat clothing.
- Sleep under a mosquito bed net if you are overseas or outside and are not able to protect yourself from mosquito bites.
What is the treatment for Zika?
There is no vaccine or specific medicine to treat Zika virus infections.
Treat the symptoms:
- Get plenty of rest.
- Drink fluids to prevent dehydration.
- Take medicine such as acetaminophen to reduce fever and pain.
- Do not take aspirin or other non-steroidal anti-inflammatory drugs.
- If you are taking medicine for another medical condition, talk to your healthcare provider before taking additional medication.
How is Zika diagnosed?
- See your healthcare provider if you develop symptoms (fever, rash, joint pain, red eyes). If you have recently traveled, tell your healthcare provider.
- Your healthcare provider may order blood tests to look for Zika or other similar viral diseases like dengue or chikungunya.
What should I do if I have Zika?
Treat the symptoms:
- Get plenty of rest
- Drink fluids to prevent dehydration
- Take medicine such as acetaminophen to reduce fever and pain
- Do not take aspirin or other non-steroidal anti-inflammatory drugs
Protect others[PDF - 1 page]: During the first week of infection, Zika virus can be found in the blood and passed from an infected person to another mosquito through mosquito bites. An infected mosquito can then spread the virus to other people. To help prevent others from getting sick, avoid mosquito bites during the first week of illness.
See your healthcare provider if you are pregnant and develop a fever, rash, joint pain, or red eyes within 2 weeks after traveling to a country where Zika virus cases have been reported. Be sure to tell your health care provider where you traveled.
Is there a vaccine to prevent or medicine to treat Zika?
No. There is no vaccine to prevent infection or medicine to treat Zika.
Does Zika virus infection in pregnant women cause birth defects?
There have been reports of a serious birth defect of the brain called microcephaly (a condition in which a baby’s head is smaller than expected when compared to babies of the same sex and age) and other poor pregnancy outcomes in babies of mothers who were infected with Zika virus while pregnant. Knowledge of the link between Zika and these outcomes is evolving, but until more is known, CDC recommends special precautions for the following groups:
- Women who are pregnant (in any trimester):
- Consider postponing travel to any area where Zika virus transmission is ongoing.
- If you must travel to one of these areas, talk to your doctor first and strictly follow steps to prevent mosquito bites during your trip.
- Women who are trying to become pregnant:
- Before you travel, talk to your doctor about your plans to become pregnant and the risk of Zika virus infection.
Strictly follow steps to prevent mosquito bites during your trip.
For more questions and answers on Zika and pregnancy, see Questions and Answers: Zika and Pregnancy.
Does Zika virus infection cause Guillain-Barre syndrome (GBS)?
Guillain-Barre syndrome (GBS) is a rare disorder where a person’s own immune system damages the nerve cells, causing muscle weakness and sometimes, paralysis. These symptoms can last a few weeks or several months. While most people fully recover from GBS, some people have permanent damage and in rare cases, people have died.
The Brazil Ministry of Health is currently reporting an increase in GBS cases that have occurred at the same time as their outbreak of Zika virus, and similar increases in GBS have been reported following past outbreaks of Zika in other countries. CDC will be conducting a study in Brazil beginning in late January to determine if any relationship exists between Zika virus infection and Guillain-Barre Syndrome.
Is this a new virus?
No. Outbreaks of Zika previously have been reported in tropical Africa, Southeast Asia, and the Pacific Islands. Zika virus likely will continue to spread to new areas. In May 2015, the Pan American Health Organization (PAHO) issued an alert regarding the first confirmed Zika virus infection in Brazil.
How many travel-associated cases have been diagnosed in the United States?
CDC continues to work with states to monitor the United States for mosquito-borne diseases, including Zika. To date, local transmission of Zika virus has not been identified in the continental United States. Limited local transmission may occur in the mainland United States but it’s unlikely that we will see widespread transmission of Zika in the mainland United States. Because of the seriousness of Zika to pregnant women and in response to the largest reported Zika outbreak, CDC and the Council of State and Territorial Epidemiologists have worked together to confirm that Zika is now a notifiable condition in the United States.
Should we be concerned about Zika in the United States?
The U.S. mainland does have Aedes species mosquitoes that can become infected with and spread Zika virus. U.S. travelers who visit a country where Zika is found could become infected if bitten by a mosquito.
With the recent outbreaks, the number of Zika virus disease cases among travelers visiting or returning to the United States will likely increase. These imported cases may result in local spread of the virus in some areas of the United States. CDC has been monitoring these epidemics and is prepared to address cases imported into the United States and cases transmitted locally.
What is CDC doing about Zika?
CDC has been aware of Zika for some time and has been preparing for its possible introduction into the United States. Laboratories in many countries have been trained to test for chikungunya and dengue. These skills have prepared these laboratories for Zika testing.
CDC is working with international public health partners and with state health departments to
- Alert healthcare providers and the public about Zika.
- Provide state health laboratories with diagnostic tests.
- Detect and report cases, which will help prevent further spread.
The arrival of Zika in the Americas demonstrates the risks posed by this and other exotic viruses. CDC’s health security plans are designed to effectively monitor for disease, equip diagnostic laboratories, and support mosquito control programs both in the United States and around the world.
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