Aside from being sick with a potentially serious illness, not vaccinating can also increase the risk of you spreading disease to people around you. This is especially troubling if they are at a higher risk of complications due to age or other health conditions. 

 Outbreaks can happen when people hesitate or refuse to vaccinate themselves or their kids (usually called being "vaccine hesitant" or "anti-vax"). When an entire community has low enough vaccination rates, outbreaks can occur because the pathogen can circulate, spreading from person to person. The World Health Organization declared the anti-vaccine movement as one of the top ten threats to global human health" (...)

https://www.gale.com/intl/databases-explored/social-issues/vaccination

Os riscos de uma pessoa não vacinada dentro de uma comunidade são