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Question 27

From Biology HL Paper 1A (May 2025, TZ2)

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  1. Azithromycin is an antibiotic commonly used to treat pneumonia, an infection of the lungs caused by Streptococcus pneumoniae. A patient was diagnosed for the second time with pneumonia, but the same antibiotic was ineffective this time. What biological explanation might there be for this?

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