The U.S. Facilities for Illness Management and Prevention strongly
doubts that this 12 months’s flu vaccine will supply individuals any
safety from the swine flu. “We don’t suppose that any of the
current vaccines are efficient,” appearing CDC Director Richard
Besser mentioned yesterday at a press convention.
However some flu vaccine researchers and public well being consultants say
the jury remains to be out. “If I hadn’t already had the vaccine,
I’d take it,” says Robert Webster, a flu guru and vaccinemaker
at St. Jude Kids’s Analysis Hospital in Memphis, Tennessee.
CDC’s Daniel Jernigan says experiments with ferrets executed there
counsel that the present vaccine has no energy in opposition to the H1N1
pressure of swine flu now circulating the globe. CDC researchers
took ferrets by no means contaminated with an influenza virus and
injected them with this 12 months’s vaccine, which has an H1N1
element of human, not swine, origin. They then examined the
ferrets’ blood sera, the half that accommodates antibodies
triggered by the vaccine, in opposition to the swine H1N1 from the
outbreak. “The sera don’t present any safety,” says
Then once more, as Jernigan acknowledges, antibodies present solely
one sort of immunity triggered by the vaccine.
The vaccine may also stimulate the cell-mediated arm of the
immune system, the half that clears contaminated cells from the
blood. The ferret mannequin doesn’t additional check the likelihood
that vaccination results in milder illness. And plenty of aged
individuals can also have some immunity from earlier infections
with related influenza viruses or earlier vaccinations.
“There’s plenty of info that we don’t have,” says
Julio Frenk, dean of Harvard College of Public Well being in Boston
and the previous secretary of well being in Mexico, like Webster,
suspects that the vaccine could do some good. Frenk notes that
Mexico has wonderful vaccine protection of kids beneath 5 years
previous and the aged, the 2 teams which were spared in
this outbreak. “There’s a probability that there’s at the least
partial safety,” says Frenk, who was in Mexico Metropolis on the
Webster, who says he wouldn’t anticipate a lot from the present
vaccine as a result of the H1N1 in it differs markedly from the brand new
pressure, nonetheless says it could make the distinction between
growing a gentle sickness and demise.
Source : http://www.sciencemag.org/news/2009/04/current-flu-vaccine-truly-impotent-against-swine-flu