The NHS is reportedly scrambling to get flu vaccines that protect against the life-threatening 'Aussie' strain amid an anticipated outbreak this winter.
Every February, the World Health Organization (WHO) assesses which three or four flu strains it expects to be circulating the following winter in the northern hemisphere.
Based on these recommendations, vaccine manufacturers start producing jabs in March.
However, the emergence of the H3N2 strain, which is behind one of the worst flu seasons ever in Australia, delayed the WHO's decision-making process by a month.
This means some vaccines may not be delivered to GP practices until November, rather than the standard September.
Flu season started unseasonably early in Australia, which is in its winter. The virus has already caused three times as many deaths as last year.
The NHS is reportedly scrambling to get flu vaccines that protect against the 'Aussie' strain amid an expected outbreak this winter. The H3N2 strain is behind one of the worst flu seasons ever in Australia, with a national death toll reaching 231 earlier this month (stock)
A letter, seen by The Telegraph, was sent by Public Health England and NHS England to all GP and community pharmacists in the country.
It warns the WHO's delayed decision-making is 'in response to a recent increase in the proportion of viruses detected which would not be effectively dealt with by its existing vaccine strains'.
It adds: 'We understand from manufacturers the delayed WHO recommendation on vaccine strain has had an impact on their vaccine supply.'
This comes after Australia's national death toll reached 231 earlier this month.
It has also had around 121,000 laboratory-confirmed cases - eight times more than normal.
There were more than 40,000 confirmed cases in June alone. This is the highest number ever recorded for the month and significantly more than the 2,000 recorded incidents last year.
And Australia is not even halfway into its flu season, which typically runs between May and September.
Experts have warned there is likely to be a second peak in cases later in the season.
Australia's flu vaccine is thought to be relatively ineffective against H3N2 because the jab was designed last September, with the strain then going on to mutate.
Professor Kanta Subbarao, spokesperson for the WHO's Influenza Centre, previously said: 'The H3N2 virus is the one we worry about because it affects the very young and the elderly.'
Elderly people are said to be less vulnerable to strains like H1N1 because they have encountered similar viruses before.
On the back of this, all UK GPs are being urged to contact flu-vaccine manufacturers to check when the jabs will be delivered.
They can then schedule immunisation appointments around this delivery date.
The delays specifically affect the quadrivalent jab, which protects against four strains of flu and is for adults aged 18-to-65 who are at an increased risk of flu but cannot have a 'live' vaccine.
This includes pregnant women and those with conditions like asthma or diabetes.
The pharma giant Sanofi Pasteur has suggested it plans to phase some of its quadrivalent vaccine deliveries, with some arriving in November.
Sanofi is one of four jab manufacturers that will be issuing vaccines this year.
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News Photo NHS is 'scrambling for flu jabs that protect against the deadly Aussie strain'
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