1 / of 3 More than 200 COVID-19 vaccines are still in development, with some now focusing on mutant strains and older people By the Specialist Reporting Team's Nick Sas Posted SatSaturday 23 updated SatSaturday 23 Vaccine manufacturers behind the frontrunners have started to look for points of difference. ( Share Print text only Cancel Experts say the best COVID-19 vaccines may not actually exist yet, with researchers set to learn from the first rollouts and evolve the science to target new mutant strains and specific populations such as older people. Key points: Vaccine makers have started focusing on the mutant strains that have appeared in Brazil, the UK and South Africa