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A deadly form of a common childhood illness has been linked to the mysterious child deaths in Cambodia that sparked alarm after a cause could not immediately be determined, Cambodian health officials said Monday.

Lab tests have confirmed that a virulent strain of hand, foot and mouth disease known as EV-71 is to blame for some of the 59 cases reviewed since April, including 52 deaths, according to a joint statement from the World Health Organization and the Cambodian Health Ministry.

The numbers were lowered from the initial report of 62 cases.

EV-71 is a virus that can result in paralysis, brain swelling and death. Most of the Cambodian cases involved children younger than 3 who experienced fever and respiratory problems that led to rapid shutdown and sometimes neurological symptoms.

Epidemiologists are still trying to piece together information about the cases by interviewing parents because some details may have been omitted or missing from medical charts and specimens were not taken from most children before they died.

Hand, foot and mouth disease has been raging across Asia and usually causes a telltale rash and is spread by sneezing, coughing and contact with fluid from blisters or infected feces. It is caused by enteroviruses in the same family as polio.

No vaccine or specific treatment exists, but illness is typically mild and most children recover quickly without problems.

The virus gets its name from the symptoms it causes, including rash, mouth sores and blisters covering the hands and feet. Many infected children do not get sick but can spread it to others.

Neighboring Vietnam has been battling a surging number of hand, foot and mouth disease cases for the past few years, with EV-71 also wreaking havoc there.

Last year, the disease sickened more than 110,000 people and killed 166, mostly children whose immune systems were not strong enough to fend off the infection.

China is also experiencing an outbreak, and more than 240 people have died of the disease this year, according to China's Health Ministry.

Questions:

1. What is hand, foot and mouth disease also known as?

2. How many deaths have been linked to the virus in Cambodia?

3. How many people have died of the disease in China?

Answers:

1. EV-71.

2. 52.

3. More than 240.

（中國日報網英語點津 Helen 編輯）

About the broadcaster:

Lee Hannon is Chief Editor at China Daily with 15-years experience in print and broadcast journalism. Born in England, Lee has traveled extensively around the world as a journalist including four years as a senior editor in Los Angeles. He now lives in Beijing and is happy to move to China and join the China Daily team.