A 7-year-old boy with acute lymphoblastic leukemia currently receiving chemotherapy presents to clinic with vital signs: BP 105/68, HR 92, RR 20, Temp 37.1°C, SpO2 98%. Recent labs show WBC 1.2K/μL and platelet count 95K/μL. He cannot receive live vaccines due to immunosuppression. His pediatrician emphasizes that high vaccination coverage among classmates is especially important for protecting him from measles exposure, with no prior measles immunity documented. Which epidemiologic principle best explains this protective effect?
- A)Cross-reactive immunity
- B)Passive immunity
- C)Artificial active immunity
- D)Herd immunityGABARITO
- E)Tertiary prevention
Explicação
Herd immunity occurs when a large proportion of a community is immune, reducing transmission and thereby protecting susceptible individuals who cannot be vaccinated. The child on chemotherapy is vulnerable, but high community coverage lowers the chance that me... Ver explicação completa e trilha adaptativa →