Thousands of vulnerable patients can wait up to two weeks to get their flu shot due to a production delay.
Pregnant women and people between the ages of 16 and 65 who were hoping to be immunized next month will be sent away.
The stock is held because of production problems at Sanofi Pasteur, one of the top NHS suppliers of flu shots every winter.
The company has written to general practitioners in England to inform them of the situation prior to the coming flu season.
Thousands of patients may have to wait up to two weeks to get their flu shot due to production problems, NHS supplier Sanofi Pasteur warned
According to estimates, Sanofi Pasteur delivers about a third of the flu shots to general practice every year in England.
Nearly 14 million high-risk people in the UK took their free NHS shot last year, including more than 11 million in England alone.
This includes people over 65, people with a weakened immune system and expectant mothers.
WHO IS ELIGIBLE FOR THE NHS FLU JAB?
The injected flu vaccine is offered for free at the NHS to people at risk.
People over 65 and people with diabetes and chronic respiratory diseases, such as asthma.
People with severe heart or kidney disease or people undergoing cancer treatment are also eligible.
Parents with children over six months of age with asthma or diabetes or weakened immunity due to illness or treatment are also encouraged to take them to general practice for a free injection.
Other groups are residents in long-term care homes and people who have reduced immunity due to HIV or who use steroid medication.
NHS employees are also being encouraged to get a free flu shot to protect patients.
Flu is not normally life-threatening for healthy people, and occasional flu offers better protection in the long term than flu vaccination.
The shot can take up to three weeks to kick in and protect you against the flu, and is necessary to save lives. It can cause serious illness and even death in vulnerable people.
Every year around 8,000 people die from flu in England, of which 6,000 have a serious problem with their heart or lungs.
Sanofi Pasteur said that 40 percent of operations will not receive scheduled deliveries on October 7 – the first week of deliveries, according to The Guardian.
About 25 percent of operations have to wait until a week later, and 15 percent receive their deliveries two weeks later, from October 21.
The second batch of deliveries, allegedly received on October 14, will be delayed by one to two weeks, the letter said.
The letter said that & # 39; 100 percent & # 39; second deliveries will be delayed.
Hospitals, which also hand out the jabs to their patients, will also face a shortage, although on a much smaller scale.
Delivery of the third and final deliveries, due in hospitals from November 4 and general practice from November 18, & # 39; remains currently & # 39; unchanged, according to the letter.
Those affected by the delay are supposed to receive the quadrivalent flu vaccine, an injection designed to protect against four different flu viruses.
People over 65 are not affected by the delay. They receive the trivalent vaccine, supplied by Sanofi or Seqirus – who said that general practice will receive all deliveries.
It is not believed that pharmacies, including Superdrug and Boots, offer the vaccine free of charge for risk groups or for a price of £ 9.99 and £ 12.99 for all others, respectively.
Brexit has raised fears that drug supplies might be disrupted, with giants in the dark about how drugs are transported in the UK in the event of a No Deal.
But it is understood that the faltering of flu vaccine supplies has to do with production and packaging problems, and not with Brexit.
Sanofi Pasteur has not made clear what the production delay is.
This is the second delay in the supply of the Sanofi quadruple flu vaccine that it wanted to deliver to the NHS this fall.
The first raid took place in July, after the World Health Organization decided longer than expected to decide which flu strains would circulate this winter.
They said that flu vaccinations have become increasingly difficult to produce because the viruses often change.
The organization also warned countries worldwide to prepare for a potential four-week delay scenario.
NHS bosses were encouraged to step up preparations for influenza earlier this year after a sharp increase in the number of virus cases in winter in Australia.
British top doctors said that the increase in Australia could be a sign of what is coming in the UK this winter.
Dr. Nick Scriven, president of the Society for Acute Medicine, said: & # 39; One concern is that last year we mainly saw one strain of flu, but there are already reports of two or three strains circulating significantly in the population that can have vaccination complicate. & # 39;
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