Dr Alex Awiti, Vice Provost at the Aga Khan University in Kenya, writes that vaccine hesitancy is understandable. People should take their time and ask all the questions they have. But it is important to accept nothing but scientific facts in response to doubts, hesitation and fears about vaccines. Lives and livelihoods depend on the power of science to combat Covid-19. Untruths and anti-science propaganda will cause the pandemic to endure.