Health workers in Canada have been told to stop using a batch of H1N1 swine flu vaccine that may trigger life-threatening allergies.
GlaxoSmithKline PLC issued the advice because people receiving shots from the vaccine batch suffered more allergic reactions than normal, the Associated Press reported.
The batch was distributed across Canada and contains 172,000 doses of the vaccine, company spokeswoman Gwenan White said Tuesday. She didn't say how many doses had been administered before the company told health workers on Nov. 18 to stop using the batch.
White said GlaxoSmithKline and Canadian health authorities are investigating the matter, the AP reported.