Current status of Zika virus as of 2025
As of 2025, Zika virus continues to circulate in many parts of the world, but the risk pattern is fragmented rather than uniform. Large, explosive outbreaks like those seen in 2015–2016 are less common, yet the virus remains detectable in many regions, including parts of Africa, Asia, the Americas, and the Pacific. Transmission still occurs mainly through the bite of infected Aedes mosquitoes, with additional, less common routes such as sexual transmission and congenital transmission. Many areas now treat Zika as an endemic or intermittently active arboviral risk, emphasizing surveillance, vector control, and situational awareness over large-scale emergency responses.
How Zika virus spreads and key transmission routes
Mosquito-borne transmission
Zika virus is primarily spread by daytime-biting Aedes mosquitoes, especially Aedes aegypti and Aedes albopictus. These mosquitoes acquire the virus when they feed on the blood of an infected person and can then transmit it to others through subsequent bites. Outbreaks tend to be most common in warm, humid climates where these mosquitoes are abundant and where populations have low prior immunity, though urban density and travel patterns also shape spread.
Non-mosquito transmission routes
- Sexual transmission: Zika can be present in semen for months after infection and can be transmitted through vaginal, anal, or oral sex, even when the partner does not have symptoms.
- Mother-to-child transmission: Infection during pregnancy can lead to congenital Zika syndrome, which may include microcephaly and other neurological abnormalities in the newborn.
- Blood and organ transmission: Documented but rare cases of transmission via blood transfusion and solid organ transplantation underscore the importance of donor screening in areas with known or recent Zika activity.
Geographic areas where Zika is still active
Although the intensity of Zika outbreaks has declined, the virus persists in many countries, particularly in tropical and subtropical regions with suitable habitats for Aedes mosquitoes. Ongoing transmission has been reported in parts of Africa, Southeast Asia, the Western Pacific, and some regions of South and Central America. Risk varies significantly by locality, season, and mosquito control measures; travelers and residents in these areas may still be exposed. Updated advisories from health authorities are essential when planning travel or interpreting local risk.
Zika symptoms, testing, and diagnosis
Most Zika infections are asymptomatic or cause only mild illness, but when symptoms do occur they may include fever, rash, joint pain, and conjunctivitis, typically lasting several days to a week. Because Zika symptoms overlap with those of dengue and chikungunya, clinical diagnosis alone cannot confirm infection. Laboratory testing via blood or urine nucleic acid tests is required to detect recent infection, while serologic tests can support diagnosis but may cross-react with related flaviviruses. Testing guidance varies by symptom onset timing, pregnancy status, and whether the person has traveled to or resides in an area with known transmission.
Risks for pregnant people and complications
Zika infection during pregnancy poses the clearest and most severe public health concern, with documented links to congenital Zika syndrome, including microcephaly, brain abnormalities, and other serious birth defects. Even infections without prominent symptoms can affect fetal development. Health authorities recommend that pregnant people and those trying to conceive avoid travel to areas with active Zika transmission and follow strict mosquito bite prevention. Those who may have been exposed should consult healthcare providers for tailored testing and counseling, including considerations for pregnancy planning and prenatal care.
Prevention and protection strategies today
Mosquito bite avoidance
Key prevention measures remain consistent: using insect repellent approved for use during pregnancy; wearing long-sleeved shirts and long pants; using permethrin-treated clothing and gear; staying in places with screens, air conditioning, or indoor sleeping areas; and removing or managing standing water around homes to reduce mosquito breeding. Because Aedes mosquitoes often bite during the day, protection is important throughout daytime hours, not just at dawn and dusk.
Sexual transmission prevention
Using condoms consistently and correctly during sex can reduce the risk of sexual transmission of Zika, especially for couples where one partner has traveled to or lives in an area with Zika activity. For people who are pregnant or planning pregnancy, healthcare providers may recommend additional precautions or testing based on potential exposure. These strategies complement mosquito bite prevention and help lower overall risk.
Surveillance, diagnostics, and public health context
Many countries continue to maintain Zika surveillance systems, including mosquito monitoring, laboratory testing, and reporting of suspected cases. These systems help detect changes in transmission intensity and support timely public health responses when needed. Seroprevalence studies and periodic assessments provide insight into population-level exposure, while research on diagnostics, vaccines, and treatments continues. Although large outbreaks are less common, the virus remains an important consideration for travelers, pregnant individuals, and areas with suitable mosquito habitats.
Testing options and interpretation
| Test type | When it is useful | Limitations and notes |
|---|---|---|
| RT-PCR or similar nucleic acid tests | During acute illness, ideally within days of symptom onset | Detects active infection; detection window is limited; may require both blood and urine samples |
| Serologic antibody tests | Later in illness or to assess recent infection in certain contexts | Can cross-react with related flaviviruses; interpretation may require a paired acute/convalescent sample; prior flavivirus exposure may affect results |
| Plaque reduction neutralization tests | More complex testing often used in public health settings; not routinely available everywhere |
What travelers and clinicians should consider
Travelers should check current Zika risk information for their destination, follow mosquito bite prevention measures, and discuss any concerns with a healthcare provider, especially if pregnant or planning pregnancy. Clinicians should consider Zika in the differential diagnosis for patients with compatible symptoms and relevant travel or exposure history, and follow testing and reporting guidance from local health authorities. Keeping up with periodic updates from national and international health agencies helps ensure decisions are based on the most current evidence.
Bottom line on whether Zika is still around
Yes, Zika virus is still present in multiple regions worldwide and continues to pose risks, particularly for pregnant people and those planning pregnancy. While large outbreaks have become less common, the virus remains endemic or intermittently active in many tropical and subtropical areas where Aedes mosquitoes thrive. Prevention today centers on mosquito bite avoidance, safer sexual practices, and informed travel planning. Testing and clinical management are tailored to individual risk, timing of symptoms, and pregnancy considerations, underscoring the value of healthcare provider guidance and up-to-date public health information.