Rapid Increase in Circulation of the SARS-CoV-2 B.1.617.2 (Delta) Variant - Mesa County, Colorado, April-June 2021. - Herlihy, Rachel; Bamberg, Wendy; Burakoff, Alexis; Alden, Nisha; Severson, Rachel; Bush, Eric; Kawasaki, Breanna; Berger, Brynn; Austin, Elizabeth; Shea, Meghan; Gabrieloff, Eduardo; Matzinger, Shannon; et al. (MMWR: Morbidity & Mortality Weekly Report, 2021)