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During World Immunization Week 2016, held 24-30 April, WHO highlights recent gains in immunization coverage, and outlines further steps countries can take to “Close the Immunization Gap” and meet global vaccination targets by 2020.

Immunization averts 2 to 3 million deaths annually; however, an additional 1.5 million deaths could be avoided if global vaccination coverage improves. Today, an estimated 18.7 million infants – nearly 1 in 5 children – worldwide are still missing routine immunizations for preventable diseases, such as diphtheria, pertussis and tetanus.

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In this Q&A, the Department's Dr Manish Sadarangani explains what Herd Immunity is and why it is so important to vaccinate our children!