On May 20 the WHO issued a Disease Outbreak News post on the nation’s ongoing dengue fever outbreak, outlining possible causes for the unprecedented ‘upsurge’ in confirmed and probable cases: ‘an increase in the viral load of asymptomatic cases over the threshold values of infectivity for mosquito vectors; lack of herd immunity in the local population for the prevailing serotype, but also for other co-circulating serotypes, thus favoring further transmission of the virus; co-circulation of different serotypes (since 2014) may result in more severe hemorrhagic fever cases and increase in deaths, in particular among secondary cases.’ The island’s popularity with tourists suggests that the ‘current outbreak increases the likelihood of exporting dengue virus to other countries’ and for the introduction of other strains through arriving passengers.
Advice for travellers
Dengue is spread by two types of Aedes mosquitoes which breed in shady areas close homes and other accommodation. Both bite mainly during the daylight hours, making them difficult to avoid outdoors. Travellers should cover up with long-sleeved tops, long pants, and shoes and socks when mosquitoes are most active. Apply repellent containing an active ingredient, such as DEET, Picaridin, or oil of lemon eucalyptus (PMD) when outdoors to all exposed skin. Read more about dengue fever and preventing insect bites.
Before you travel, call Travelvax Australia’s telephone advisory service on 1300 360 164 (toll-free from landlines) for country-specific advice and information. You can also make an appointment at your nearest Travelvax clinic to obtain vaccinations, medication to prevent or treat illness, and accessories for your journey.