Don't panic over bad doses, experts advise

Vaccines in China are deeply mired in a crisis of trust, as public concerns about safety continue in the wake of recent scandals.

Meanwhile, experts are calling for a rational attitude toward immunization.

"Vaccination is the most effective and safest way to prevent diseases. If parents refuse to have their children vaccinated - especially vaccinations on the priority recommended list - they will put their children at much higher risk," said Zeng Guang, an epidemiologist at China's Center for Disease Control and Prevention.