China needs to more closely regulate the market for private vaccines within its borders, the World Health Organization said Tuesday after authorities broke up a massive illegal drug ring earlier this month.

Police in China arrested more than 130 people allegedly involved in the illegal drug trade after the group dumped around $48 million worth of illegal vaccines onto the private Chinese drug market. Much of the medicine had expired before it was sold.

“This incident has highlighted the need for more, stricter enforcement of vaccine management regulations across the board,” WHO China representative Bernhard Schwartlander said in an email.

According to Chinese police, a woman and her daughter, who have since been arrested, led the drug ring and sold more than $100 million worth of illegal vaccines across the country since 2001.

Private sellers

All told, 29 pharmaceutical companies are believed to have sold the illegitimate drugs to 16 institutions.