Depends on the vaccination. The doctor gives you a place of where to inject it.
A mare should have all of her regular vaccinations and possibly a booster in her 9th month.
Unless you know how to give vaccinations let your vet do it.
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There is no reason not to mass vaccinate.
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Not everyone feels that vaccinations should be required. Some people are actually quite against them. However, those that feel vaccinations should be required site that they help prevent the spread of serious diseases.
Vaccinations recommended for a trip to Argentina are: The routine vaccinations (which you likely already have had) Yellow Fever Hepatitis A & B Typhoid
To find out what vaccinations your child needs for school or what vaccinations your child has already been given, one should contact their physician or pediatrician. They have all records on these administered vaccines.
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Thomas Malthus was opposed to vaccinations because he believed that population should be left to a means higher up. Population, in his mind, would take care of itself and overpopulation by means of vaccinations was not natural.