For some, fall Covid shots may come with copays -- or no coverage at all

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7. Of course a big part of stopping a contagious disease

is having as many people as possible in the population immune to the disease. And there are usually two ways to be immune, having had the disease and being vaccinated.
So having fewer people vaccinated means that everyone in the population has a higher risk to get the disease.
Even people doing everything that they can to stay safe, including getting vaccinated, are at higher risk because the level of vaccinated in society is less.
Still, those who are vaccinated have lowered their own risk of serious complications.