I can’t speak for New Mexico but Georgia schools have been in session for nearly a month already which is probably plenty of time to get a surge going.
On a bit of a tangent here, but I find the current (CDC?) recommendations to be frustrating. The policy for my son, told to me by the pediatrician and the county board of health, was that he needed to quarantine for days 1-5 after testing positive, then he could return to school as long as he wore a mask for days 6-10. I asked how long he would be contagious and was told “10 days.” I blurted out, “They’re allowed back while they’re still contagious?! No wonder he has Covid!” and the doctor replied, “I know.” Ridiculous. How well do you think pre-K and kindergartners are keeping masks on their faces, not to mention they would have to take them off three times a day to eat anyway. What genius came up with this policy?
FTR, my son has been too sick to return to school yet, so he will be well past the contagious period by the time he does. To my knowledge, the school never even notified other parents about the exposure.