flu vaccine protects against four strains of influenza virus as against three
strains in the older trivalent vaccine.
It has now become official policy to use quadrivalent flu vaccine in the
Why the Change to Quadrivalent Flu Vaccine?
are two important influenza A strains and two important influenza B
strains. Trivalent vaccines provided
cover against viruses from both A strains and one B strain. A quadrivalent vaccine which covered the
second B strain became available several years ago but was not considered cost
effective. However, over the past few
years, the additional cost of quadrivalent vaccine has come down and other
countries adopted it.
When, in the
2017-18 season, a flu epidemic arose from the B strain that was not included in
the trivalent vaccine, a decision was taken in the UK to change to quadrivalent
vaccine. Quadrivalent vaccine is now the
internationally accepted vaccine of choice.
has been able to source quadrivalent vaccine at a cost-effective price and we
do not believe it is any longer appropriate to offer trivalent vaccine.
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