Modified Live Vaccines vs. Killed Vaccines
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killed (inactivated vaccine) eliminates the chance for an infection from the vaccine virus or bacteria. A killed vaccine does not usually produce as good immunity as an MLV, and therefore, may contain an adjuvant and require two doses. Using an adjuvant can increase the potential for a local or allergic reaction.
Modified live vaccines tend to give a better immunity because the virus or bacteria is actually multiplying in the dog or cat, providing greater stimulation to the immune system. MLV vaccines will also tend to begin to provide protection sooner!
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