The World Health Organization (WHO) and a pharmaceutical company have warned the doctors in Canada not to use a batch of H1N1 swine flu vaccines after reports that the shots were leading to great number of severe allergic reactions.

Six victims of the bath have suffered from anaphylactic shock which is a significantly deadly reaction after getting the GlaxoSmithKline (GSK) inoculation called Aprepanrix.

A company spokesperson told the media that every case was related to one specific shipment of around 170,000 vaccines and that similar problems had not been observed in other countries.

Canadian government health officials and GSK are investigating the batch but the investigation was not through yet by Wednesday. Six provinces received the vaccines: Alberta, British Columbia, Saskatchewan, Manitoba, Ontario, and Prince Edward Island but nothing could be made out about the numbers that were already used.

The Public Health Agency of Canada in a statement announced, "People who have received the vaccine and have not had an allergic reaction have no reason to be concerned, the fact that we have identified a potential safety issue underscores that our monitoring system works."