Zika Virus Is Spreading in Bali: What the CDC's New August 2026 Travel Notice Means for Your Trip

The CDC issued a Level 2 Travel Health Notice for Zika virus in Bali, Indonesia on August 7, 2026, after a rise in Zika cases among returning travelers. The U.S. Embassy in Jakarta followed three days later, on August 10, with its own health alert reinforcing the same message. If Bali is on your itinerary this year, here is what actually changed and what it means for your trip.

Our providers field a steady stream of Bali questions every week, from honeymooners to families to the wellness-retreat crowd that has made Ubud one of the most searched destinations on earth. So we will answer the two questions travelers ask first: no, this notice does not mean cancel your trip, and yes, it matters more for some travelers than others.

What the CDC notice actually says

A Level 2 notice means "practice enhanced precautions." It sits below a Level 3 ("reconsider nonessential travel") and well below a Level 4 ("avoid all travel"). In plain terms, the CDC is telling travelers Zika is actively circulating in Bali and mosquito bite prevention needs to be a real part of your packing list and your daily routine, not an afterthought.

Zika virus spreads primarily through the bite of an infected Aedes mosquito, the same genus responsible for dengue and chikungunya. These mosquitoes bite mainly during the day, with peak activity in the early morning and again in the late afternoon and evening, which is different from the nighttime-biting mosquitoes that carry malaria. Zika can also spread through sex and from a pregnant woman to her fetus during pregnancy.

There is one group for whom this notice is not a "practice precautions" situation but a "reconsider the trip" situation: pregnant travelers. The CDC's specific recommendation is that pregnant women avoid travel to Bali while this notice remains active.

Why pregnancy is the center of this story

Zika made global headlines in 2015 and 2016 because of its connection to microcephaly and other serious birth defects, and that connection is exactly why this notice carries more weight than a typical mosquito-borne disease alert.

CDC surveillance data from U.S. states and territories found that Zika-associated birth defects occurred in about 8 percent of pregnancies with laboratory-confirmed Zika infection in the first trimester, compared with about 5 percent for infections identified in the second trimester and about 4 percent in the third. An earlier, closely studied outbreak in French Polynesia estimated the risk of microcephaly specifically from a first-trimester infection at just under 1 percent, a lower figure than the more recent U.S. territory data, which illustrates how much these estimates can vary by population and study design. What has not varied is the direction of the finding: earlier infection in pregnancy carries meaningfully higher risk, and there is no safe trimester.

This is also why the sexual transmission piece of Zika prevention gets less attention than it deserves. Zika can be passed from an infected partner during sex even if that partner never develops symptoms, which is part of why CDC's guidance extends beyond "don't get pregnant while in Bali" to "manage your risk for months after you get home."

Zika symptoms: mild for most, but easy to miss

Here is the part that surprises most travelers: the WHO reports that most people infected with Zika virus never develop any symptoms at all. When symptoms do appear, they are typically mild and include:

• Low-grade fever
• Rash
• Conjunctivitis, or red, irritated eyes
• Joint and muscle pain
• Headache and general malaise

Symptoms usually resolve on their own within 2 to 7 days. That mildness is exactly the problem. A traveler can be infected, feel little more than run-down for a few days, and unknowingly carry the sexual transmission risk window and the pregnancy risk considerations home with them regardless of whether they ever felt sick.

Zika versus dengue: the mosquito is the same, the danger isn't

Bali carries year-round dengue risk as well, and dengue and Zika look nearly identical in their first few days: fever, rash, joint pain, headache. Both are carried by the same daytime-biting Aedes mosquitoes, which means the prevention advice is identical even though the diseases themselves are not.

The distinction matters clinically. Zika's most serious risk is to a developing fetus. Dengue's most serious risk is to the traveler, specifically a second dengue infection with a different strain, which raises the risk of severe dengue, a syndrome that can involve dangerous bleeding and shock. If you develop fever and rash within two weeks of leaving Bali, tell whoever evaluates you exactly where you traveled and when. That travel history is often what determines which test gets ordered first.

One more reason this distinction matters for self-care: if you are running a fever and are not yet sure whether it is dengue or Zika, avoid aspirin and other NSAIDs like ibuprofen until dengue has been ruled out, since those medications can worsen the bleeding risk associated with dengue. Acetaminophen is the safer choice for fever and pain in the meantime.

Prevention: the same steps, taken more seriously

None of the individual prevention steps here are new. What is new is the reason to actually follow all of them instead of packing a travel-size repellent and calling it done.

• Use an EPA-registered repellent containing DEET, picaridin, or IR3535, and reapply according to the label, especially during Aedes peak biting hours in the early morning and late afternoon.
• Treat clothing and gear with permethrin rather than applying it to skin. Permethrin-treated clothing stays effective through multiple washes and adds a layer of protection repellent alone does not.
• Cover up during peak biting hours. Long sleeves and long pants matter more in Bali than in destinations where mosquitoes bite mainly at night, because Aedes activity peaks when you are most likely to be out sightseeing.
• Sleep and stay in air-conditioned or well-screened spaces where possible, since Aedes mosquitoes also bite indoors.
• Use condoms or abstain from sex during your trip and for months afterward if you or your partner may have been exposed, per the waiting periods below.

We break down the full DEET-versus-picaridin-versus-permethrin comparison, including which formulations actually hold up in humid, high-mosquito environments like Bali, in our insect repellent guide for travelers.

The conception waiting periods travelers miss

This is the piece of CDC guidance that catches the most people off guard, because it applies whether or not you ever felt sick.

• Women with possible Zika exposure should wait at least 2 months after symptom onset, or after their last day in an area with Zika risk, before trying to conceive.
• Men with possible Zika exposure should wait at least 3 months after symptom onset, or their last possible exposure, before trying to conceive, since Zika virus can persist in semen longer than in other body fluids.
• Couples not actively trying to conceive should use condoms or abstain from sex for the same 3-month window after possible exposure, to avoid sexual transmission to a partner.

These windows apply even if you feel completely fine after your trip. Given that most Zika infections cause no symptoms at all, the safest approach is to observe the waiting period based on your travel dates, not based on whether you noticed anything.

The bigger picture: Zika hasn't disappeared, it's just quieter

Zika's global case counts peaked during the 2016 outbreak and declined substantially through 2017 and 2018, and coverage of the virus declined right along with it. But the WHO notes that 92 countries and territories have now reported evidence of mosquito-transmitted Zika, and low-level transmission persists in parts of the Americas and other endemic regions even in years without headlines. Bali's August 2026 notice is a reminder that "quiet" is not the same as "gone," particularly anywhere Aedes mosquitoes are already established, which includes most of tropical and subtropical Southeast Asia.

For a broader look at where Zika risk still exists globally and how it compares across destinations, see our full guide to Zika virus for travelers.

What we'd tell a patient booking Bali right now

If you are not pregnant and not planning to conceive in the next few months, this notice is a reason to take mosquito prevention seriously, not a reason to cancel. Bring repellent with DEET or picaridin, treat your clothing with permethrin before you go, and plan around peak daytime biting hours the same way you would plan around sun exposure.

If you are pregnant, the CDC's guidance is direct: avoid Bali while this notice is active. If Bali is part of a longer Southeast Asia itinerary, start a destination check with Wandr so we can walk through your specific route, trimester, and options, including whether travel insurance that covers itinerary changes makes sense given the notice. For everyone else, get your questions answered and your trip plan reviewed before you go instead of after you're already worried about a rash on day four.

Start your free destination check on Wandr to get Bali-specific guidance for your dates, your health history, and the rest of your itinerary.

This article is for informational purposes and does not replace individualized medical advice. Travel health guidance, including CDC notice levels, can change quickly. Confirm current recommendations before you travel.