FILE- A nurse prepares to administer vaccine for COVID-19 at a private vaccination center in Gauhati, India, April 10, 2022. The quickly changing coronavirus has spawned yet another super contagious omicron mutant that's worrying scientists as it gains ground in India and pops up in numerous other countries, including the United States. Scientists say the variant, which is called BA.2.75, may be able to spread rapidly and get around immunity from vaccines and previous infection. (AP Photo/Anupam Nath, File)