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BEIJING, Feb. 25 (Xinhua) -- China has maintained a high vaccination rate of vaccines under the country's immunization program above 90 percent, a health official said Monday.

Gao Fu, director of the Chinese Center for Disease Control and Prevention, made the remarks at a press conference.

China's immunization program requires vaccinations against diseases such as hepatitis B, poliomyelitis and measles for children and those against diseases such as anthrax for targeted groups.

The country's vaccines are safe and effective overall, according to Gao.

Gao said a work team has been set up to analyze vaccine-related problems exposed over recent years to ensure effective solutions.

He also called for more proactive prevention and control measures, including higher inoculation rates, against influenza.