A scandal over faulty vaccines in China has sparked anger on social media, underscoring the difficulties regulators face in rebuilding trust after years of food and drug safety scares.

The scandal erupted a week ago, after major vaccine maker Changsheng Biotechnology was found to have violated standards in making a rabies vaccine for humans.

Last week, China’s Zhejiang Huaihai Pharmaceutical said it was recalling a heart drug sold in the United States after the European Medicines Agency found that it was tainted with an impurity linked to cancer.

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