Bad vaccines may still be on the shelves

Two companies produced low quality rabies serums in 2008

SHANGHAI - China will step up the monitoring of a faulty rabies vaccine that has been recalled but may still be on the market, officials from the country's State Food and Drug Administration (SFDA) said on Friday.

Although the vaccine was recalled and production shut down late last year, China's lax regulatory environment means doses of the vaccine may still be on the shelves, officials said.