A possible discovery in the flu vaccine has resulted in the temporary closing of all influenza immunization clinics in Saskatchewan.

The decision follows a Health Canada recommendation that the flu vaccine made by the pharmaceutical firm Novartis not be used, pending the review of the clumping of particles in the vaccine in Europe.

The move comes after the discovery of tiny clumps of virus particles in some batches made at the company's plant in Italy.

Saskatchewan's Chief Medical Health Officer says this is a precautionary measure, and people who have had the vaccine should not be unduly concerned.

Novartis says tiny clumps of virus particles are sometimes seen in vaccines.

The firm provides about 20 per cent of Canada's flu vaccine.

The Public Health Agency of Canada indicates it has received no reports of adverse events related to these vaccines overseas.

The immunization clinics will resume once the Health Canada review is completed.