We get there with this cornivirus, when every one has some immunity to it. So either the cold or the flue scenario seems like a potentially ideal scenario. Is that fair? There must be something that looks worse. Yes, well, so i think there are still some unknown sritbuses in, you vargrus. We don't know exactly how it's going to behave. And the one thing we can say its it's almost certainly going to keep changing,. The flue virus keeps changing every year as well.