Covid 19 NationalOmicron’s new sub-variants BA.5.1.7 and BF.7 are signals to be cautious: ExpertsANIOctober 17, 2022 by ANIOctober 17, 2022 BF.7 is known as the ‘Omicron spawn’ that was first detected in China and now reached the United States, UK, Australia, and Belgium New Delhi:...