This is because herd immunity is compromised below a threshold, which for measles is extremely high. So a relatively small number of kids who aren't vaccinated can infect quite a few people
Exceptions are where there are multiple sites of infection, for example legionella, but if you have an asymptomatic but lab-confirmed case of, say, hepatitis B, it's still a case
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In the case of pertussis vaccination, people can unknowingly be infected with the disease post-vaccine and be contagious, but never experience significant symptoms. They still have an infection, they just don't know it. They also are unlikely to be caught by monitoring systems
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Disease is also different than infection. In any case, I'm also half asleep and burned out. Let's stop arguing over words. A vaccine may stop expression of symptoms, but not infection. We need to know which is the case with the measles vaccine.
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