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发信人: whiteclouds (/ 参考消息 /), 信区: Parenting
标 题: ABC News: Vaccines may have increased swine flu risk
发信站: BBS 未名空间站 (Mon Mar 14 13:51:33 2011, 美东)
Vaccines may have increased swine flu risk
By Annie Guest
Updated Fri Mar 4, 2011 7:37pm AEDT
There is renewed controversy surrounding influenza vaccines, with some
studies showing people immunised against the seasonal flu might have been at
greater risk during the swine flu outbreak.
Infectious diseases expert Professor Peter Collignon has called for a review
of Australia's flu vaccine policy in light of the new research, but the
Federal Government has defended its vaccination program.
Immunisation can be a sensitive issue, particularly when it comes to adverse
effects in children.
Professor Collignon from the Australian National University (ANU) says the
new research will only heighten sensitivities.
"What was a bit surprising when we looked at some of the data from Canada
and Hong Kong in the last year is that people who have been vaccinated in
2008 with the seasonal or ordinary vaccine seemed to have twice the risk of
getting swine flu compared to the people who hadn't received that vaccine,"
he said.
ANU microbiologists say it is the opposite of what vaccines should do.
Professor Collignon says the findings of the study also highlight the
benefits for healthy people who are exposed to some illnesses.
"Some interesting data has become available which suggests that if you get
immunised with the seasonal vaccine, you get less broad protection than if
you get a natural infection," he said.
"It is particularly relevant for children because it is a condition they
call original antigenic sin, which basically means if you get infected with
a natural virus, that gives you not only protection against that virus but
similar viruses or even in fact quite different flu viruses in the next year.
"We may be perversely setting ourselves up that if something really new and
nasty comes along, that people who have been vaccinated may in fact be more
susceptible compared to getting this natural infection."
The Government's National Immunisation Program (NIP) targets those most
likely to have a poor outcome from flu, with the seasonal flu vaccine
recommended for anyone over six months old.
Professor Collignon says that in light of the study, the Australian
Government and health policy makers need to look at whether vaccines
actually do more harm than good, particularly in people who otherwise have
not got risk factors.
But the Federal Government's chief health officer, Professor Jim Bishop,
says the evidence is patchy.
"There's a study from Canada which might suggest in that direction but there
are other studies which contradict it as well, so I don't think that the
evidence is clear about the effect of prior vaccine," he said.
Professor Bishop says the Commonwealth's flu vaccination program has been
effective and beneficial.
He said IUC admissions were cut from 700 during the first outbreak of swine
flu down to about 60 admissions last winter as a result of the vaccination
program.
"Secondly, the number of admissions were about one-tenth of what they were
the previous year, so that was in the face of a new strain, a new type of
virus," he said.
While Mr Bishop says there is no evidence having the flu vaccine is a bad
thing, Professor Collignon blames influential drug companies and frightened
politicians for what he says is the overuse of flu vaccines in healthy
people.
The World Today requested an interview with Health Minister Nicola Roxon,
but she was unavailable. |
