Flue Vaccines - What's Next?

High levels of virus will lead to the development of variance, because a virus mutates. If there's a lot of virus in the elation, it is a good chance to develop strains of the virus that can evade immunity. We need to vaccinate everybody across the world as soon as possible," says professor bryant. This means countries will need multiple rounds of jabs, which is already being used in many countries to combat influenza.