As variants of the SARS CoV-2 keep global health authorities on edge, experts caution about a possible increase in Covid-19 cases, though there is no indication currently that the off-shoots would cause a severe disease. The sub-lineages are derivatives of Omicron, with more or less mutations, says virologist Dr Gagandeep Kang, calling for surveillance, including sequencing. “There is no indication that the new sub-lineages will cause more severe disease than any other virus we have seen previously, although an increased ability to spread and infect means that there...