**************************************************
The Centre for Health Protection (CHP) of the Department of Health (DH) is today (November 4) investigating a confirmed case of Japanese encephalitis (JE) affecting a 5-year-old boy and hence urged the public to take precautions against mosquito-transmitted diseases.
The patient, with good past health, has developed fever and shortness of breath since October 25. He sought medical consultation from a private practitioner on October 26 and was admitted to a private hospital for high fever and convulsion on October 29. He was transferred to the Paediatric Intensive Care Unit of Queen Mary Hospital on November 1 for further management. The patient is currently in serious condition.
His cerebrospinal fluid sample tested positive for antibodies against JE, a viral disease transmitted by the bite of infective mosquitoes, upon laboratory testing by the Public Health Laboratory Services Branch of the CHP.
Initial enquiries by the CHP revealed that the patient had travelled to Tokyo, Japan, between October 11 and 14. His travel collaterals and home contacts have remained asymptomatic so far. The CHP's investigation is proceeding.
Apart from the above case, to date, four JE cases (two local and two imported) have been reported to the CHP this year. Three cases (two imported and one local) were reported in 2012 while one (a local case) was reported in 2011. Locally, no cases were reported from 2008 to 2010.
A CHP spokesman explained that JE is a viral disease transmitted by the bite of infected mosquitoes. Culex tritaeniorhynchus (Culicine mosquito) is the principal vector of JE and is nocturnal. It mainly breeds in waterlogged fields, marshes, ditches and small stagnant collections of water around cultivated fields. The mosquitoes become infected by feeding on pigs and wild birds infected with the JE virus, and then transmit the virus to humans and animals during the feeding process. JE is endemic in the Mainland and Southeast Asia.
Most JE virus infections are mild without apparent symptoms other than fever with headache. More severe infections are clinically characterised by quick onset of headache, high fever, neck stiffness, impaired mental state, coma, tremors, occasional convulsions (especially in infants) and paralysis.
To prevent contracting JE, members of the public, particularly those living in rural areas, are reminded to take heed of the following preventive measures, especially after dark:
* Wear long-sleeved clothes and trousers;
* Use effective insect repellents containing DEET over exposed parts of the body when outdoors; and
* Use mosquito screens or nets in rooms which are not air-conditioned.
Travellers to endemic areas of JE should take the following precautions:
* Avoid outdoor exposure to mosquito bites at dusk and dawn, especially in rural areas, when mosquitoes spreading this virus are most active;
* Apply effective insect repellents containing DEET over exposed parts of the body and clothes; and
* Consider vaccination that should be completed at least 10 days before departure to endemic areas in Asia or the Western Pacific for staying over one month, particularly in high-risk rural areas.
The public may visit the CHP's website (www.chp.gov.hk/en/content/9/24/28.html) for more information on JE and that of the DH's Travel Health Service (www.travelhealth.gov.hk) for further information on JE vaccination and outbreaks in other areas.
Ends/Monday, November 4, 2013
Issued at HKT 18:56
NNNN
