It seems to come and go when Guinness is most vulnerable-- like a cold sore. Strangely, it strikes hardest on the weekends.
Although I can not see it--it seems to be quite a big virus by the feel of things--with strange sproings and sprockets popping out all over the place.
Apparently it attaches itself to Guinness and follows him around where ever he goes. It drains all his energy. There is nothing Guinness can do to shake it off--he just has to wait it out til the thing goes away on its own.
Luckily, Guinness seems to accept his condition. He seems patiently resigned and carries on the best he can...
The humans were really worried. I heard them speaking in code. They said things like "Uh-oh Groucho is coming, how is this going to work with Maggi..." and " Oh no, Groucho wants to hang out with Guinness". I think they were afraid I was going to catch it! But I went right up to the virus and there was no trouble. I must be immune!