Chinese health authorities have launched a campaign against dengue fever as the country suffers its worst outbreak of the mosquito-borne disease in 20 years.

The National Health and Family Planning Commission (NHFPC) said on Tuesday that 13,965 dengue fever cases have been reported this year, with the mosquito population five times its normal level due to hot and wet weather in south China.

The commission called for efforts to cut numbers of mosquitoes, including by sealing puddles of stagnant water, common breeding grounds for the insects. It also suggested people wear trousers and long sleeves to cover their skin.

In addition to the unusual weather, authorities believe that another factor in the outbreak is cases contracted abroad.

The NHFPC also warned of risks of contracting the lethal Middle East Respiratory Syndrome, and urged those traveling to the Middle East to take precautions and seek early medical treatment in case they experience illness.

Dengue fever, a viral infection transmitted by mosquitoes, mostly hits tropical and sub-tropical regions. Symptoms include fever, nausea, rashes, backache and headaches. The hemorrhagic variant, which causes severe internal bleeding as blood vessels collapse, is often fatal. Endi

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