Community pharmacists are directed to contact their relevant manufacturers and confirm delivery dates. Photo: iStock

Deliveries of the standard quadrivalent flu vaccine will be delayed until November 2019, flu vaccine manufacturers said.

They cited a delay of four weeks by the World Health Organization for its recommendation on one of the strains of the virus as the reason.

Sanofi Pasteur informed official agencies that they may adopt a phased delivery scheme for their inactivated quadrivalent influenza vaccines for those at risk and aged under 65.

Some batches of the vaccines can be expected by the end of November, ahead of the flu season, said a joint letter from Public Health England, NHS England and NHS Improvement.

To plan effectively for the season, the letter directs community pharmacists and all other primary care providers who have ordered quadrivalent influenza vaccine to contact relevant manufacturers and confirm delivery dates.