Question

why do schools strongly recommend vaccinations? to be fair to all students to protect school staff to guarantee that students regularly visit a doctor to protect students who cannot be vaccinated with herd immunity

Explanation:

Vaccinations create herd immunity. When most students are vaccinated, it protects those who cannot be vaccinated due to medical reasons. This is the main reason schools recommend vaccinations.

Answer:

to protect students who cannot be vaccinated with herd immunity