A Zika infection is caused by a virus that is passed from an infected mosquito. The virus may cause flu-like symptoms in some. Severe complications or illness that need hospitalization are very rare. The Zika virus is also linked to certain birth defects, see Zika Virus Infection and Pregnancy for more information.
A specific type of mosquito can pick up the Zika virus when it bites someone with a current Zika infection. The mosquito can then pass the virus to the next person it bites. Once the virus is in the body it can spread and lead to symptoms.
Virus Attack on Cell
Copyright © Nucleus Medical Media, Inc.
The greatest risk factor is spending time in a high risk area without proper mosquito protection. A current outbreak of Zika has been reported in:
Previous outbreaks have been reported in Africa and Southeast Asia. Check with government travel resources to see where current outbreaks are before you travel.
Most people infected with the Zika virus will never develop symptoms. The body can detect and remove the virus before symptoms begin.
If symptoms do develop, they may appear a few days after the bite. Symptoms may last a few days to a week and can include:
You will be asked about your symptoms and medical history. A physical exam will be done. A viral infection may be suspected based on your symptoms. Talk to your doctor about any recent travel, especially to high risk areas.
There are a number of similar viruses that can be passed from mosquitoes such as chikungunya or dengue. A blood test may be done to determine the specific virus that is causing the symptoms.
Symptoms should pass on their own within a week. There are no medications to treat a Zika infection, basic home care including rest and drinking enough fluids can help recovery.
Acetaminophen may be recommended to help decrease fever or pain. Other over the counter medications like NSAIDs and aspirin are not recommended if the specific virus has not been identified. NSAIDs and aspirin can cause complications with other mosquito-borne illnesses such as dengue infection.
The Zika virus may exist in the body or in sperm for a short time even after symptoms have passed. To decrease the risk of passing the virus to a new fetus the US Center for Disease Control (CDC) recommends:
For those who have been to high risk areas but have shown no symptoms the CDC recommends waiting at least 8 weeks before attempting pregnancy. You should talk to your doctor about any concerns you may have about future pregnancy.
There is no current vaccine for the Zika virus. Protecting yourself from mosquito bites is the best prevention. If you live in areas with known mosquito-related illnesses or you are traveling to areas with this risk:
For babies and children:
There is some concern that the Zika virus can be passed during sexual activities. A condom can prevent the spread. If your partner has recently been to high risk areas, a condom is recommended for the first week or so to prevent the spread of Zika.
If you have the Zika virus, it is unlikely that you can pass it directly to other people with casual contact. However, if a mosquito bites you while you are infected, that mosquito can then pass the infection to someone else. The mosquito will most often affect people nearby such as family or neighbors. It is important to take precaution against mosquito bites while you are infected, about a week, to prevent the spread of the virus.
Centers For Disease Control and Prevention
World Health Organization
Public Health Agency of Canada
Zika virus disease questions and answers. WHO website. Available at:
...(Click grey area to select URL)
Last updated January 20, 2016. Accessed December 15, 2017.
Zika virus fact sheets. Centers for Disease Control and prevention website. Available at:
...(Click grey area to select URL)
Last update: November 14, 2017. Accessed December 15, 2017.
Zika virus infection. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T909469/Zika-virus-infection . Updated October 31, 2017. Accessed December 15, 2017.
Zika virus in pregnancy and congenital Zika syndrome. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T910450 . Updated December 1, 2017. Accessed December 15, 2017.
9/30/2016 DynaMed Plus Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T909469/Zika-virus-infection :CDC Zika interim response plan. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/zika/public-health-partners/cdc-zika-interim-response-plan.html. Updated September 30, 2016. Accessed December 15, 2017.
Last reviewed November 2018 by
EBSCO Medical Review Board
Michael Woods, MD, FAAP
Last Updated: 11/17/2017