How could having children in school who have not had vaccinations affect infection rates of measles mumps or even a comeback of polio?

Having unvaccinated children in schools can significantly increase the risk of outbreaks for vaccine-preventable diseases like measles, mumps, and polio. These diseases are highly contagious, and when vaccination rates drop below herd immunity thresholds, even a small number of unvaccinated individuals can lead to transmission within communities. This not only puts the unvaccinated children at risk but also endangers vulnerable populations, such as infants and those with compromised immune systems, who cannot be vaccinated. Consequently, the resurgence of these diseases can strain public health systems and lead to increased morbidity and mortality rates.