At least 20 managers and directors of key public hospitals in South China's Shenzhen city are suspected of having accepted bribes, the local procuratorate said on Tuesday.

From April to June, Shenzhen prosecutors conducted a campaign to fight corruption in the medical system.

The investigation found bribery is "prevalent" in buying of medical equipment, consumable materials and drugs, and the personal interests of certain individuals and private companies have driven the over-prescription of antibiotics.