evidence: Whether you’re an Ochsner Fitness Center with multiple locations, conducting temperature checks at the door, disinfecting equipment, and encouraging mask-wearing to protect employees, or you’re a restaurant that has suddenly had to reconfigure the entire seating arrangement, businesses know that this is an opportunity to keep the economic wheels spinning, provided the public can feel and be safe. That will require cooperation from both sides — the businesses must comply with new regulations and Louisianians must wear masks to protect workers who are continually exposed. [...] There are still many Louisianians who want everything open, in spite of the risks. The concept of herd immunity — in which a significant percentage of the population has been exposed — would take a very long time to reach, and there would likely be many deaths. Ochsner recently completed a prevalence study, and while data is still being compiled, a source familiar with the results said that fewer people than expected have been exposed, and we’re a long way from any sort of herd immunity, at this point. [...] Using Mardi Gras as a big lesson, we now know that being part of a big crowd when the virus is still present means it’s only a matter of time before it comes roaring back.