Dopo aver letto questo articolo, che ho estrapolato da un contesto più ampio, avrete una visione diversa a riguardo le vaccinazioni.
La fonte è il Dott.Schultz autore dell'articolo stesso.
Voglio sottolineare che di questi studi ed articoli in America è pieno dando una visione completamente diversa da quella che abbiamo in Italia.

VACCINATION NEWSFLASH [CIMDA support] RE: J DODDS VACCINE PROTOCOL
I would like to make you aware that all 27 veterinary schools in
North America are in the process of changing their protocols for
vaccinating dogs and cats.
Some of this information will present an ethical & economic
challenge to Vets, and there will be skeptics. Some organizations have
come up with a 'political' compromise suggesting vaccinations every 3
years to appease those who fear loss of income vs. those concerned
about potential side effects. 'Politics', traditions, or the doctors
economic well-being should not be a factor in a medical decision.
NEW PRINCIPLES OF IMMUNOLOGY
Dogs and cats immune systems mature fully at 6 months. If a modified
live virus vaccine is given after 6 months of age, it produces
immunity, which is good for the life of the pet (i.e.: canine
distemper, parvo, feline distemper). If another MLV vaccine is given a
year later, the antibodies from the first vaccine neutralize the
antigens of the second vaccine and there is little or no effect. The
titer is not "boosted" nor are more memory cells induced.
Not only are annual boosters for parvo and distemper unnecessary, they
subject the pet to potential risks of allergic reactions and immunemediated
haemolytic anemia. There is no scientific documentation to
back up label claims for annual administration of MLV vaccines.
Puppies receive antibodies through their mothers milk. This natural
protection can last 8 - 14 weeks. Puppies & kittens should NOT be
vaccinated at LESS than 8 weeks. Maternal immunity will neutralize the
vaccine and little protection (0-38%) will be produced.
Vaccination at 6 weeks will DELAY the timing of the first highly
effective vaccine.
Vaccinations given 2 weeks apart SUPPRESS rather than stimulate the
immune system.
A series of vaccinations is given starting at 8 weeks and given 3-4
weeks apart up to 16 weeks of age.
Another vaccination given sometime after 6 months of age (usually at l
year 4 mo) will provide LIFETIME IMMUNITY.