Vaccines: Do they wear out? And other questions answered
Vaccines have saved tens of millions of lives in the past century, yet a huge worldwide study revealed there is a growing hesitancy against vaccination.
Experts warn public mistrust of vaccines means the world is taking a step backwards in the fight against preventable infectious diseases, and a study by the World Health Organisation, the biggest global study into people's attitudes on immunisation, shows trust is worryingly low in some regions.
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