Official Answer Key & Detailed Solution
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Correct Answer: Option (B) — 1 and 2 only
Concept & Option Breakdown
Standard Reference VerifiedStatement 1 is correct: Pneumococcal conjugate vaccines (PCVs) protect against Streptococcus pneumoniae, which causes invasive diseases including pneumonia, meningitis, and sepsis. Statement 2 is correct: By preventing pneumococcal infections, the unnecessary and empiric use of antibiotics is decreased, reducing the selective pressure for antibiotic resistance. Statement 3 is incorrect: No medical vaccine is guaranteed to have zero side effects or cause no allergic reactions.
Absolute claims like 'have NO side effects' or 'cause NO allergic reactions' are scientifically false for any pharmacological or biological agent.
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