Update on number of dengue fever cases
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Regarding imported cases, from November 4 to 10, three were recorded and the patients had been to India (one case) and Thailand (two cases) during the incubation period. As of November 10, the 113 imported cases so far in 2016 were mainly from Indonesia (35), the Philippines (17) and Thailand (17). As for local cases, four have been detected to date in 2016.
The CHP has been closely monitoring the latest dengue situation in neighbouring and overseas areas. In Guangdong, there were 434 cases as of October 23, of which 322 were local cases. In Asia, 377 local cases have been filed to date in Taiwan in 2016; 54 008 cases in Thailand; 12 586 in Singapore since January 3; and 309 in Japan since January 4. In the Americas, the latest figures indicated that 1 452 284 cases were filed in Brazil and 99 759 in Mexico in 2016.
Dengue viruses encompass four serotypes, each of which can lead to DF and severe dengue (dengue haemorrhagic fever). Symptoms of first infection are usually mild. After recovery, immunity to that serotype will develop, but subsequent infections of other serotypes are more likely to result in severe dengue, which is potentially fatal.
DF is transmitted to humans by the bites of infective Aedes mosquitoes. When a dengue patient is bitten by a mosquito, it is infected and may spread the disease by biting other people. In Hong Kong, the principal vector, Aedes aegypti, is not found, but the prevailing species, Aedes albopictus, can also spread the disease.
There is no locally registered dengue vaccine in Hong Kong. Eliminating stagnant water as breeding sites for mosquitoes and avoiding mosquito bites are key to preventing DF.
"Apart from general measures, travellers returning from affected areas should apply insect repellent for 14 days upon arrival in Hong Kong. If feeling unwell, seek medical advice promptly and provide travel details to the doctor," a spokesman said.
The public should call 1823 in case of mosquito problems and may visit the following pages for more information: the DF page of the CHP and the Travel Health Service, the latest Travel Health News, tips for using insect repellents, the CHP Facebook Page and YouTube Channel, and the Food and Environmental Hygiene Department's Guidebook on Control and Prevention of Mosquito Breeding.
Ends/Friday, November 11, 2016
Issued at HKT 16:01
Issued at HKT 16:01
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