Zika virus disease is mainly spread by mosquitoes. For most people it's a very mild infection and isn't harmful. But it may be more serious for pregnant women, as there's evidence it causes birth defects – in particular, abnormally small heads (microcephaly). If you travel to an affected area, you can reduce your risk of catching the virus by using insect repellent and wearing loose clothing that covers your arms and legs.
Most people don't have any symptoms. If symptoms do occur, they're usually mild and last around 2 to 7 days.
Commonly reported symptoms include:
Most cases of Zika virus disease are spread by infected mosquitoes biting humans. Unlike the mosquitoes that spread malaria, affected mosquitoes (the Aedes mosquito) are most active during the day, especially during mid-morning, then late afternoon to dusk. There have been a small number of reports of Zika virus being passed on through sexual intercourse, although the risk is thought to be low.
Before travelling, seek travel health advice from your GP, practice nurse or a travel clinic, ideally 4 to 6 weeks before you go. To reduce your risk of infection, you should avoid being bitten by an Aedes mosquito.
The most effective bite prevention methods, which should be used during daytime and night-time hours, include:
How Zika virus infection is treated
There's no specific treatment for Zika virus symptoms. Drinking plenty of water and taking paracetamol may help relieve symptoms.
If you feel unwell after returning from a country that has malaria, as well as having a high or moderate risk of Zika virus transmission, you should seek urgent (same day) advice to help rule out a malaria diagnosis.
If you remain unwell and malaria has been shown not to be the cause, seek medical advice.
Source : https://www.nhs.uk/conditions/zika/