Seventeen people have been punished after 145 Chinese children were found to have been given expired polio vaccines in Jinhu County, east China's Jiangsu Province, according to local authorities.
Earlier this week, authorities found that a batch of polio vaccines with an expiration date of December 11 was being administered orally to children at a county-run health facility in Jinhu.
The head of the health facility is among those who have been punished.
Local authorities said on Saturday mismatches in the online system were the cause of the use of expired vaccines, as the batch numbers were not updated.
Officials said that a special investigation team has been formed to conduct comprehensive and impartial investigations, and the results will be released in a timely manner.
As of Wednesday, 145 children were found to have been given the expired vaccines.