1/3 Global science on #COVID19 is emerging at a fast pace. Recent studies from countries that have analysed transmission patterns for large numbers of cases now demonstrate pre-symptomatic virus spread is occurring. #PlanktheCurve

2/3 This means that the virus causing #COVID19 can be spread from an infected person in the period _just before_ their symptoms appear. Evidence suggests that this is happening more often than previously thought. #PlanktheCurve

3/3 There is also evidence that some infected people who never develop symptoms are also able to transmit the virus. This is called asymptomatic transmission. #COVID19 #LayerUpCOVID #PlanktheCurve