Test results from a batch of drugs came back negative, China's top drug watchdog said on Wednesday.

The testing by Shanghai's drug authorities came after a batch of human immunoglobulin for intravenous injection made by China Meheco Xinxing Pharma Co Ltd, a Shanghai pharmaceutical company, tested positive for the HIVantibody.

Authorities in Jiangxi Province also conducted testing of HIV nucleic acid on a patient who had used the drug and the result also showed negative, according to the National Medical Products Administration.

The administration ordered authorities in Shanghai to conduct on-the-spot investigation at the company and test relevant products made using the same plasma. It has also dispatched inspection teams to Shanghai and Jiangxi.

The National Health Commission of China has ordered medical treatment institutions in China to suspend use of the problematic batch of medicine and seal it.

The commission has organized a group of experts who said the risk of HIV infection is low for patients who have used the drug, based on the manufacturing technique and pH index of the product, according to the commission.

The city's drug watchdog ordered the manufacturer to suspend operation and launch an emergency recall of the immunoglobulin.