I know Jon was pretty sick in Philly and a little under the weather in AC but I did not notice it in his voice or energy (a little in AC he seemed subdued but like this past show the IBTFY break did the trick and he gave us two long encores). Only diehards on the boards noticed- my kids and friend at both shows thought it was the best they had ever seen. If allergies are chronic for him this time of year I am sure he has learned to live with them.