We were on Mariner over New Years with no problems at all (that I knew of at least). One thing they did at Windjammer was to set up sanitation stations. There were a whopping 2 electronic dispensers that you put your hands under and a little bit of sanitizer came out. The first day, they were making everyone use it before entering. As each day passed, they got more and more lax about it, and by the end of the trip, the stations werent even out. I didnt notice people cleaning like I have on past cruises either. You might want to bring along your own Purell to use right before eating since everyone touches the serving utensils. Of course if the virus is in the food, theres not much you can do about it other than be sure its hot before eating. Just remember, there are over 2000 people on board in confined spaces. Everything you touched has been touched by a lot of others. Washing your hands is the best prevention!