What should you know about microcephaly and Zika virus?

Microcephaly means a baby’s head is smaller than expected for age and sex, often because brain growth has been affected. Zika is mainly spread by infected mosquitoes, and it can also be transmitted through sex. Infection may cause no symptoms or a mild illness such as rash, fever, red eyes, joint pain or headache.

The concern is greatest when infection occurs during pregnancy because the developing fetus can be affected. A small head measurement alone does not identify the cause; clinicians interpret it with pregnancy history, examination and ultrasound findings.

Contact a GP or maternity clinician promptly if you are pregnant, planning pregnancy, or may have had Zika exposure through travel or sex. Share travel dates, destinations, mosquito bites, symptoms, and the dates of sexual contact. Do not rely on symptoms alone to rule infection in or out.

A travel health consultation can review destination-specific exposure and pregnancy planning. Ask about mosquito-bite prevention, sexual precautions, testing availability and any recommended pregnancy monitoring. Use repellent as directed, wear clothing that covers skin, and reduce standing water around living areas.

Seek prompt advice after possible Zika exposure during pregnancy or when planning conception. Get urgent help for severe headache, weakness, difficulty walking, breathing problems, confusion or a rapidly worsening illness. A fever with rash or joint pain after travel also warrants clinical assessment, even if symptoms are mild.

Ask whether your exposure warrants testing, how long precautions should continue, whether fetal monitoring is advised, and which symptoms should trigger an urgent review.