Dengue outbreak worsened by spread of new strain

A strain of dengue new to Singapore is impeding efforts to stem the spread of the mosquito-borne disease that has infected hundreds in the affluent city-state this year.

Authorities said earlier this week that Singapore recorded a nearly 50 percent increase in dengue infections in the first 4-1/2 months of this year compared to the same period in 2006.

The disease, which causes joint pain, high fever, nausea and a rash, is endemic to the region. In severe cases, it leads to internal bleeding and sometimes death. The virus now predominant in Singapore is believed to be the same as in neighboring Indonesia, and is different from the main active strain in Singapore over the past few years.

Those previously infected with other types of dengue are not immune, and may even face a higher risk of complications when infected with a different strain. Health officials have been combing public housing estates in search of mosquito breeding sites. Dengue-carrying insects can breed in tiny pools of water found in flower pots, discarded bottles or cans, or old tires.

The Health Ministry said the recent spike in infections is likely due to warmer weather during this period of the year, which is conducive for breeding mosquitoes and the spread of dengue.