>> reporter: jamie, good evening. people are already getting their booster shots at clinics like these, but in several states, many are refusing to still get even their first shot, and that's where hospitals are being stretched to their limits. more and more, this is becoming a pandemic of the unvaccinated. from his hospital bed at this billings, montana, clinic, covid survivor adam ptaszynski's voice is hoarse, but he hopes you can still hear him. >> i should have gotten the shot, but i was too stubborn and too stupid. >> reporter: i.c.u. beds are running out in big sky country. more than 100 national guard members have been called in to help. kallie kujawa oversees the covid response for boseman health. >> there's a sense of compassion fatigue amongst our staff in knowing that the vaccine has been proven to prevent severe illness, yet, we're continually having to care for people who have severe illness. >> reporter: health experts continue to recommend americans wear masks but there's still resistance. >> no more masks!