A 7-year-old boy with acute lymphoblastic leukemia currently receiving chemotherapy (HR 102, BP 98/62, temp 37.2°C) has an absolute neutrophil count of 800/μL and 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, despite normal measles serology. Which of the following best explains this protective effect?
- A)Cross-reactive immunity
- B)Tertiary prevention
- C)Passive immunity
- D)Artificial active immunity
- E)Herd immunityGABARITO
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 →