> Immunization though, is a matter of public health
Not necessarily. Human-to-human transmission isn't the primary vector (if even possible) for a lot of diseases we get vaccinated for, e.g. yellow fever, Japanese encephalitis, lyme disease, tetanus, shingles, rabies, etc.
...Measels, Mumps, Rubella, Polio, Varicella (i.e. what you need to contract to get shingles).
We can both make lists of equal length back and forth, but we also both know that there are plenty of communicable diseases between humans. Would we be having this debate if the outbreaks weren’t measles, but Variola Major? ZEBOV?
Not necessarily. Human-to-human transmission isn't the primary vector (if even possible) for a lot of diseases we get vaccinated for, e.g. yellow fever, Japanese encephalitis, lyme disease, tetanus, shingles, rabies, etc.