The Delta Plus variant is more likely to cause Covid infections that show no symptoms compared to the Delta strain, according to new research.Officially called AY.4.2, scientists say Delta Plus is more likely to result in cases that show no symptoms.The new research also shows that Covid was was just as prevalent in the UK from mid-October to early November as it was in January during the second wave.School-age children and teenagers had the highest rates of infection of up to over five percent.Imperial College London's React-1 study analysed swabs more than 100,000 swabs in England taken from October 19 to early November 5.The prevalence was 1.57 percent – the same as January – compared to 0.83 percent in September.According to the data,