Dengue Fever risk in Zanzibar

Dengue Fever in Zanzibar: Prevention Guide

Dengue fever is a mosquito-borne viral infection causing high fever, severe headache, joint and muscle pain, and rash. In rare cases, it progresses to severe dengue, which can be life-threatening. There is no specific treatment, so prevention matters most.

Zanzibar's tropical climate creates ideal conditions for Aedes mosquitoes, the carriers of dengue. Risk factors include year-round warm temperatures, seasonal rainfall that creates standing water in urban areas, dense population in Stone Town and surrounding neighborhoods, limited waste management that leaves containers collecting water, and increased international travel bringing new viral strains. Outbreaks tend to spike during and after the long and short rainy seasons.

What you can do:

1. Eliminate standing water weekly. Empty, scrub, or cover buckets, flower pots, discarded tires, and any container that holds water around your home or guesthouse. This is the single most effective step.

2. Use insect repellent containing DEET, picaridin, or oil of lemon eucalyptus on exposed skin, especially during early morning and late afternoon when Aedes mosquitoes bite most actively.

3. Wear long-sleeved shirts and long pants, particularly at dawn and dusk. Light-colored clothing may help reduce mosquito attraction.

4. Use bed nets and window screens. If your accommodation lacks screens, sleep under a permethrin-treated net even during daytime naps, since these mosquitoes bite during the day.

5. Seek medical attention immediately if you develop sudden high fever with severe headache, pain behind the eyes, joint pain, or rash. Inform the healthcare provider you recently traveled to Zanzibar. Avoid aspirin and ibuprofen, which can worsen bleeding risk.

There is currently no widely available dengue vaccine for travelers. Your best protection is consistent mosquito bite prevention throughout your stay.