Herd immunity is not junk science or a false theory. Herd immunity is real, it works, and explains how people in a community are protected from a disease when vaccination rates are above a certain threshold.
Bobby Kennedy finally gets it right, admitting that chickenpox killed 100 people a year in the pre-vaccine era.
Vaccine titer testing is available to confirm your immunity for some vaccine-preventable diseases.
In addition to vaccines, quarantines are an important way to control vaccine-preventable diseases.