Originally posted by shtferbrains
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They will list the efficacy against the strains they’re for, so say 95% effective against Histophiluls but that doesn’t mean it’s even a little bit effective against mycoplasma. You wouldn’t be able to say you seen the 5% not covered by the vaccine unless you cultured the type and confirmed that what the calf has was the same kind you vaccinated for.
Also coming into play here is vaccine handling. I know of people that had big wrecks with IBR because the vaccine was not stored and handled correctly.
Pfizer and Zoetis and all the companies are never going to say something works 100%, because nothing does. Efficacy is subject to a lot factors.
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