coronavirus could have festered in the USA - and it is spreading fast. The second mutation, in addition to the so-called Kent strain that started in south east England, is up to 50% more infectious.A report seen by CNBC News suggested that a task force established to deal with the disease had warned that a recent spike could have been caused by the variation.According to the outlet, the report said: “This acceleration suggests there may be a USA variant that has evolved here, in addition to the UK variant that is already spreading in our communities and may be 50% more transmissible.“Aggressive mitigation must be used to match a more aggressive virus; without uniform implementation of effective face masking (two or three ply and.