SINGAPORE'S dengue fever epidemic has entered its 12th week and is looking serious.

There are three strains of the virus that are almost equally active, and this is a rare occurrence.

As a result, weekly infection cases are at a six-year high, and more than double the figures seen in the first three months of the last three years.

Experts fear that if these trends continue, this year's outbreak could be worse than in 2005, when 14,000 people fell ill and 25 died.