Annual Reformulation of Flu VaccineFurther information: Historical annual reformulations of the influenza vaccine See also: 2009 flu pandemic vaccine
Each year, three strains are chosen for selection in that year's flu vaccination by the WHO Global Influenza Surveillance Network. The chosen strains are the H1N1, H3N2, and Type-B strains thought most likely to cause significant human suffering in the coming season. Starting with the 2012-2013 Northern Hemisphere influnza season (coincident with the approval of quadrivalent influenza vaccines) the WHO has also recommended a 2nd B-strain for use in quadrivalent vaccines. The World Health Organization coordinates the contents of the vaccine each year to contain the most likely strains of the virus to attack the next year.
- "The WHO Global Influenza Surveillance Network was established in 1952. The network comprises 4 WHO Collaborating Centres (WHO CCs) and 112 institutions in 83 countries, which are recognized by WHO as WHO National Influenza Centres (NICs). These NICs collect specimens in their country, perform primary virus isolation and preliminary antigenic characterization. They ship newly isolated strains to WHO CCs for high level antigenic and genetic analysis, the result of which forms the basis for WHO recommendations on the composition of influenza vaccine for the Northern and Southern Hemisphere each year."
The Global Influenza Surveillance Network's selection of viruses for the vaccine manufacturing process is based on its best estimate of which strains will predominate the next year, amounting in the end to well-informed but fallible guesswork.
Formal WHO recommendations first issued in 1973; beginning 1999 there have been two recommendations per year, one for the northern hemisphere (N) and the other for the southern hemisphere (S).
Historical annual reformulations of the influenza vaccine are listed in a separate article. Recent WHO seasonal influenza vaccine composition recommendations:
Read more about this topic: ACAM-FLU-A
Other articles related to "annual reformulation of flu vaccine, vaccines, flu, vaccine":
... The composition of virus vaccines for use in the 2013-2014 Northern Hemisphere influenza season recommended by the World Health Organization on February 20, 2013 was an A/California/7/2009 (H1N1)pdm09-like virus ... It is recommended that quadrivalent vaccines containing two influenza B viruses contain the above three viruses and a B/Brisbane/60/2008-like virus †It is recommended that A/Texas/50/2012 is used as the A(H3N2 ... The H1N1 strain used in these compositions is the same strain used in the 2009 flu pandemic vaccine, now known as A(H1N1)pdm09 ...
Famous quotes containing the word annual:
“From the point of view of the pharmaceutical industry, the AIDS problem has already been solved. After all, we already have a drug which can be sold at the incredible price of $8,000 an annual dose, and which has the added virtue of not diminishing the market by actually curing anyone.”
—Barbara Ehrenreich (b. 1941)