Hong Kong's Center for Health Protection is investigating reports of an unusual occurrence of meningococcemia, a government press release said in Hong Kong Tuesday.

Travelers to Baguio and Filipinos, the Philippines, returning to their homeland are reminded to observe good personal hygiene to avoid the illness. Returning travelers should seek medical advice if they become ill, and disclose their recent travel history with the doctor, advised the press release.

The World Health Organization and Philippine health authorities are investigating the Baguio City outbreak, however no travel advisory has yet been issued.

In Hong Kong, between three and 14 cases of meningococcal infection were reported yearly from 2000 to 2003.

Meningococcemia is caused by a bacterium known as meningococcus invading the bloodstream. It causes sudden fever, intense headache, nausea and vomiting, and can lead to shock and even death in severe cases. It is transmitted by direct contact with those infected.

Early cases can be treated effectively with antibiotics. The incubation period varies from two to 10 days, and is commonly three to four days.

Source: Xinhua