Forty-four primary school students in south China's Guangdong Province fell sick and have been hospitalised after receiving the hepatitis B vaccine at a school.
44 out of the total 84 students, who were administered the vaccine, developed symptoms of a reaction, including vomiting, stomach aches and dizziness at the primary school in Huilai County in Jieyang City, Xinhua news agency quoted Wu Junqiu, Head of the Disease Prevention and Control Center of Huilai, as saying.
Among them, 39 have already got better and only had slight stomach pains now. The other five students throats were inflamed, Wu said.
The patch of HB vaccine used numbered 110,000 doses. Of which, more than 90,000 doses had been administered but no other cases of abnormal reaction had been reported, Wu said.
However, local health authorities have sealed the remaining vaccine, stopping further use, after the students' illnesses.
The provincial disease prevention and control center dispatched experts to Jieyang Thursday to probe into the case.
"The investigation is still under way," Wu said.
The batch of HB vaccine, with a shelf life till September 1, 2010, was produced by a company based in Shenzhen city of Guangzhou.