US health officials have halved the recommended isolation time for people with asymptomatic Covid-19 from 10 to five days, amid a surge in cases.
The measure is expected to alleviate disruption caused by staff shortages in many areas because of infections.
The Centers for Disease Control (CDC) says most transmissions happen in the two days before and three days after symptoms develop.
The CDC also shortened the quarantine period for people exposed to someone infected. Unvaccinated people will be required to quarantine for five days after exposure, down from 14.
The CDC is supposed to give recommendations based on the actual science. This decision is based on a balance of the science and the larger policy implications of their recommendations. But the CDC is supposed to be just about the science. The policy makers are supposed to take that recommendation, balance it with other considerations, and make public policy. Where we have lost our minds with COVID is that we have surrendered policy making to the CDC and now made them into an agency that decides public policy instead of makes recommendations to inform public policy.