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Título relacionado a la introducción

Vaccines contain modified viruses, an agent that resembles a disease-causing microorganism and improves the immunity in two parts: production of antibodies and stimulation of body’s immune systems to the particular disease.

The two parts of immune system will react quickly to destroy the disease-causing agent, if later exposed to the disease.

Kittens and puppies obtain immunity from their mother’s milk however this wanes after 6 to 20 weeks of age. Therefore, a series of vaccines are given starting at 8 weeks of age and “booster” shots every 4 weeks until immunity is high, which is normally at 16 weeks. Second vaccine will stimulate greater response if it is given after 4 weeks from prior vaccine.