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Faunsdale, AL | Short answer ..... no, those vaccines are usually protective.
TB is probably an exception to that. Most people in western countries don’t get vaccinated against TB. My understanding is the vaccine (BCG) doesn’t always prevent infection but usually prevents clinical disease. It’s used a lot in parts of the world where their public health system isn’t capable of eliminating TB by testing and treatment. They made the decision to limit the effects of disease on society by vaccination but make it nearly impossible to come back later and try to eliminate it entirely.
That being said, some of the older vaccines are very very effective....... until there’s an outbreak. The disease is introduced from somewhere and then you find that not all vaccinated people are immune.
But for the introduction of the disease to test it, we would assume that the vaccines work 100%.....in reality, no they’re not 100%. It’s the old herd immunity at work that makes them seem to provide such ironclad protection.
Herd immunity is great but it’s really got to be close to 100% across the population. That’s how all those vaccines we’re all familiar with are so effective. | |
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So much for vaccinations
