In the fourth year of the pandemic, Covid-19 is once again spreading across America and being driven by the recent holidays, fewer precautions and the continuing evolution of Omicron subvariants of the virus.
New sub-variants are causing concern for their increased transmissibility and ability to evade some antibodies, but the same tools continue to curtail the spread of Covid, especially bivalent boosters, masks, ventilation, antivirals and other precautions, experts said.
