COVID-19 outbreak: Authorities race to trace, isolate UK returnees; new coronavirus strain found in Nigeria As per the Centre's SOPs issued on Tuesday, passengers coming from the UK should undergo RT-PCR test and be isolated in a separate unit of an institutional facility if found positive FP Staff December 25, 2020 00:01:03 IST A health worker collects sample for COVID-19 test at a KSRTC bus stand in Bengaluru. PTI Health authorities in Africa on Thursday said that yet another mutation of the novel coronavirus appears to have emerged in Nigeria. This, as India continued racing to trace and isolate passengers who recently returned from the United Kingdom, where a variant of the novel coronavirus