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must first be tested, to make sure they are effective and safe.
The tests involve vaccinating a cat or dog with a sample from each batch of vaccine and then testing its blood to see if the vaccine has worked.
This one test is enough to "prove" a whole batch of vaccine.
It means that 50,000 loved pets are assured of protection from agonising deaths from diseases like distemper and parvovirus.Cat and dog vaccines are manufactured in laboratories using products of non-animal origin or, in some cases, tissue cultures. Cats and dogs are only involved in the testing of the finished product.
Laboratory tests which don't use animals are being developed to test vaccines.