The concept makes no sense. As soon as a carrier hits a group that does not have widespread immunities, you will get a disease cluster. Not only do you have t

The concept makes no sense. As soon as a carrier hits a group that does not have widespread immunities, you will get a disease cluster. Not only do you have to have a huge portion of the population exposed to the disease, you need to maintain that proportion indefinitely AND will still deal with occasional flair ups among vulnerable communities. That's not what most people think when they hear the word "immunity".