Under the system, which has covered all vaccine products since 2006, regulators conduct compulsory inspection and approval of each batch of vaccines before they leave factories. Items that fail inspection or approval shall not be allowed to be be sold or imported.

"The batch release system gears the vaccines to international standards," Yang said.

A sign of endorsement of the quality and management system of Chinese vaccines, China is now lining up vaccines for WHO prequalification, Wang said.

At present, the Henan-based Hualan Biological Bacterin Co. Ltd, and the Chengdu subsidiary of China National Biotec Group have been approved by the WHO for their seasonal flu vaccine and Japanese encephalitis vaccine respectively, making them eligible for purchase by the United Nations.

It was revealed earlier this month that improperly stored vaccines worth tens of millions of U.S. dollars had been sold illegally in 20 provincial-level regions since 2011. More than 130 people have been apprehended after they were implicated in the high-profile vaccine scandal.

Wang called for faith in Chinese vaccines and encouraged the public to continue inoculations despite the scandal. "It's more effective and cheaper to prevent a disease than treat it."