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Anti vaccine people ...

That's what makes me sick. And it makes their children sick at their parent's expense!

From: Six common misconceptions about immunization ...

https://tinyurl.com/yxeu57pw :

"The majority of people who get disease have been vaccinated."

"This is another argument frequently found in anti-vaccine literature, the implication being that this proves that vaccines are not effective. In fact it is true that in an outbreak those who have been vaccinated often outnumber those who have not — even with vaccines such as measles, which we know to be about 98% effective when used as recommended."

"This apparent paradox is explained by two factors. First, no vaccine is 100% effective. To make vaccines safer than the disease, the bacteria or virus is killed or weakened (attenuated). For reasons related to the individual, not all vaccinated persons develop immunity. Most routine childhood vaccines are effective for 85% to 95% of recipients. Second, in a country such as the United States the people who have been vaccinated vastly outnumber those who have not."

I'll explain the true meaning of that last statement, as I'm sure it confuses many: a very small percentage of a very large group [the vaccinated] can easily outnumber a very high percentage of a small group [those opposed to vaccination at their children's expense].
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Smallpox vaccination can protect you from smallpox for about 3 to 5 years. After that time, its ability to protect you decreases. If you need long-term protection, you may need to get a booster vaccination.

Historically, the vaccine has been effective in preventing smallpox infection in 95% of those vaccinated. In addition, the vaccine was proven to prevent or substantially lessen infection when given within a few days after a person was exposed to the variola virus.

https://www.cdc.gov/smallpox/vaccine-basics/index.html
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How Well Does the MMR Vaccine Work?

MMR vaccine is very effective at protecting people against measles, mumps, and rubella, and preventing the complications caused by these diseases. People who received two doses of MMR vaccine as children according to the U.S. vaccination schedule are usually considered protected for life and don’t need a booster dose. An additional dose may be needed if you are at risk because of a mumps outbreak.

One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella.

https://www.cdc.gov/vaccines/vpd/mmr/public/index.html#how-well-mmr-works