A-LevelBiologyInfectious diseases9700/12 · May/June 2012 · Q371 Mark
Cholera is no longer common in many countries. What is the reason for this?
Aeducation of the citizens about the spread of the disease
Broutine vaccination by local health authorities
Ctreatment of water supplies and separate sewage treatment
Dtreatment of water to control mosquitoes
✓ Correct answer
C: treatment of water supplies and separate sewage treatment
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