"It remains unclear whether the cases observed originated in the UK or arrived from overseas, but the UKHSA identified five 'variants of concern' in the country, including the Delta and Omicron strains." via RT Headline Image Caption/Credit: The UK Health Security Agency has begun tracking the so-called 'Deltacron' variant of the Covid-19 coronavirus. © Getty Images / loops7 UK health officials are investigating cases of the previously dismissed hybrid strain of Delta and Omicron variants, but said they are "not concerned" Health authorities in the UK have officially begun monitoring the so-called 'Deltacron' variant of the Covid-19 coronavirus that is thought to be a hybrid of the Omicron and Delta strains. The move comes after experts at the World Health Organization and elsewhere had dismissed the variant as a lab error last month. The UK Health Security agency (UKHSA) included the mutant strain – which emerges when different variants merge inside a host – in its latest weekly