At least 145 children were administered expired polio vaccines in eastern China, state media reported, despite the government promising to prevent such lapses in the industry following a major scandal last year.

Thirteen county-level health officials in Jiangsu province have been dismissed since the case came to light earlier this week -- the latest to raise public health concerns -- Jinhu county government said late Friday according to state broadcaster CCTV.

Three other county-level health officials are under investigation and a case has been established against a local official, the broadcaster said.

A parent discovered earlier this week that a batch of orally administered polio vaccines were being given to children at a county-run health facility nearly one month after their December 11 expiration date, CCTV reported on Thursday.

The local government has since found 145 children received the vaccines between December 11 and January 7, CCTV said, quoting a government source.

Local health officials have said the expired vaccines would have decreased efficacy but should not cause adverse health effects.

The World Health Organization's website says that people given such vaccines that have expired are "unlikely to get sick as a reaction to receiving the vaccine" but warns that they might not be adequately immunised.

CCTV said some parents reported adverse reactions among children, including vomiting and drowsiness, but it was unclear if this was just a normal allergic reaction to the medicine.

Beijing announced a nationwide clean-up of the country's vaccine industry last year after it emerged that a major Chinese manufacturer of rabies vaccines had fabricated records.

Authorities maintain that affected rabies vaccines did not enter the market, but the case triggered public outrage over frequent safety scares involving sub-par or toxic food, drugs and other products despite repeated government crackdowns.

The vaccines have been ordered sealed and the county has launched inspections of all health-related departments.

The polio vaccine is provided free by the government for children between two months and four years old.

AFP calls to the Jinhu government went unanswered.

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