A deadly intestinal virus has killed another child in eastern China, raising the death toll to 21 as the number of those infected rose to nearly 3000, state press reported on Friday.

The latest death occurred in the city of Fuyang in Anhui province, which has been the epicentre of an epidemic that has infected 2946 children as of Friday, Xinhua news agency reported, citing local health officials.

The number of children infected with the enterovirus 71, known as EV71, has risen by nearly 500 since Wednesday, the report said.

EV71, which causes hand, foot and mouth disease, is very contagious and is spread through direct contact with the mucus, saliva, or faeces of an infected person. Young children are most susceptible because of lower immune systems.

The disease begins with fever, blisters, mouth ulcers and rashes, and has spread in Anhui since early March, amid accusations by the Chinese media of a government-led cover up of the epidemic.

Most of the stricken are under the age of six, with 879 children currently being treated in Fuyang hospitals, nine of whom are in critical condition, the report said. Forty others were in serious condition.

News of the epidemic only surfaced on Monday, when it was reported that 19 children had died.

State television showed video footage of parents from rural areas of Anhui bringing their toddlers to overcrowded hospitals in Fuyang.

Health officials warned that although older people may not show symptoms of the disease, they could be carriers of the virus and could possibly infect others, the report said.

"Fuyang city is strengthening medical emergency treatment and prevention and control measures in every way possible," Xinhua said, noting that treatment facilities would be expanded.

The World Health Organisation earlier this week expressed concern over the epidemic, which in serious cases can lead to brain, heart and lung damage.

It said in a statement Wednesday that while enteroviruses are found across the world, "the situation (in Anhui) is still of concern especially because of the current high reported case fatality rate compared to previous years."

China's health ministry has tried to calm fears, saying early discovery of the disease and better treatment has lowered the mortality rate, but has warned that the disease was likely to spread.

"We estimate that the hand, foot and mouth disease (caused by EV71) in Fuyang city will still continue for some time, the number of cases will continue to increase, and serious and fatal cases might still continue to happen," the ministry said Wednesday.

Fears of a wider epidemic have been stoked by reports that 16 children had caught EV71 in neighbouring Henan province.

AFP