by guest » Mon Aug 23, 2004 12:27 pm
Veterinarians Question Vaccination Procedures
Vaccinations can have adverse effects, studies show
By Rhonda L. Rundle
THE WALL STREET JOURNAL
July 31
After receiving a reminder in the mail from his veterinarian, Jim Schwartz
took his 11-year-old poodle, Moolah, for her annual rabies shot. A few
weeks later she fell ill and was diagnosed with an autoimmune disease. As
her suffering worsened, Mr. Schwartz put her down.
THERE’S NO PROOF that the rabies shot killed Moolah and Mr. Schwartz didn’t
immediately suspect any link. But when the retired financial planner
learned that some veterinarians are vaccinating pets less frequently
because of possible fatal side effects, he was furious. “No dog should have
to go through what Moolah did,” he says.
Evidence is building that annual vaccination of dogs and
cats performed for diseases such as rabies, distemper and parvovirus may
not be necessary and could even be harmful. Vaccines licensed by the U.S.
Department of Agriculture are tested to ensure they protect pets against
disease, usually for one year. But the tests don’t detect long-term side
effects, or measure the duration of a vaccine’s effectiveness. Recent and
continuing studies at several universities suggest that protection from
vaccines may last for years, which would make annual shots for some
diseases a waste of money at the very least.
Fears of vaccine-induced diseases date back more than 40 years. But a sharp
increase during the past decade in cancerous tumors among cats, between the
shoulder blades where vaccines typically are injected, has spurred studies.
Some have found a higher-than-expected incidence of side effects. “We see
health problems in dogs for which we have no explanation. The classic one
is autoimmune disease,” says Larry Glickman, professor of epidemiology at
Purdue University’s School of Veterinary Medicine in West Lafayette, Ind.,
who is studying possible links with vaccinations. “We see an epidemic of
hyperthyroidism in cats today, and we suspect that these are happening
because we’re over-vaccinating our pets.”
ACCUMULATIONS ARE THE DANGER
Dr. Glickman and his colleagues theorize that repeated vaccination
causes dogs to produce antibodies against their own tissue. The antibodies
are caused by contaminants in the vaccine introduced in the manufacturing
process. While the amounts are minuscule, they gradually accumulate with
repeated vaccinations over the years. But Dr. Glickman cautions that more
research is needed before a clear link can be established between antibody
levels and autoimmune disease.
Vaccination recommendations for cats and dogs vary around the country. Most
states require rabies vaccinations every three years, while a handful of
states as well as some individual cities and counties have mandated
annual shots due to local problems with rabies in wild animals. Some other
vaccinations are given only when a pet’s lifestyle or environment exposes
it to a particular risk, such as Lyme disease.
Pet diseases other than rabies aren’t a threat to people, thus vaccinations
aren’t required by law. But veterinarians and vaccine makers have
traditionally recommended annual booster shots against potentially fatal
diseases such as distemper and parvovirus in dogs and herpesvirus in cats.
In a policy statement last year, the American Veterinary Medical
Association acknowledged that the practice of annual vaccinations is based
on “historical precedent” and “not on scientific data.”
The emerging evidence of health risks is prompting some vets to
change their practices. “We’re now doing 40% less vaccinations than five
years ago,” says Kathleen Neuhoff, a veterinarian in Mishawaka, Ind., and
president of the American Animal Hospital Association, Lakewood, Colo.
FINANCIAL REASONS?
“My own pets are vaccinated once or twice as pups and kittens, then
never again except for rabies,” Ronald D. Schultz, chairman of the
University of Wisconsin’s Department of Pathobiological Sciences, wrote in
the March 1998 issue of Veterinary Medicine.
Some critics of annual shots accuse some vets of ignoring research
about vaccine risks for financial reasons. “Vets are afraid they will go
broke” without regular vaccines, which account for about 20% of their
practice income, says Bob Rogers, a Spring, Texas, veterinarian and
outspoken critic of current practices.
Other vets deny that financial motives are involved. (“No one who
is motivated by money would ever become a veterinarian,” Dr. Neuhoff says.)
“The concern is that if we move too quickly to decrease vaccine frequency
across the board, we may be opening the door for some animals to become
infected when we could have prevented the problem,” says Todd R. Tams,
chief medical officer of VCA Antech Inc.,in Los Angeles, the nation’s
largest owner of veterinary hospitals.”
No one truly knows how long protection from vaccines lasts. Vaccine
makers say that proving their duration would be expensive and would require
large numbers of animals to be isolated for years.
One company, Pfizer Inc., decided to test its one-year rabies
vaccine on live animals and discovered it lasted for at least three years.
It sells the identical formula simply packaged under different
labels Defensor 1 and Defensor 3 to satisfy different state vaccination
requirements.