@WHO: RT @WHOSEARO: It's #WorldImmunizationWeek Vaccination is one of the most effective ways to prevent diseases. #vaccines protect against more than 25 life-threatening diseases, like measles, polio, tetanus, diphtheria, meningitis, influenza, tetanus, typhoid & cervical cancer. #VaccinesWork https://t.co/ucOIrv1YAB

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