Apart from skimming the text features, which were quite satisfying, I've only read the Judge Dredd strip, because it looked like fun. None of the other strips do and I haven't read all of the Megazine for about 6 months. I'll probably catch up over the summer.
It was a pretty enjoyable Dredd and it's great to see Brendan McArthy at work on the character again. However, vaccines don't work like that. If you've already been bitten then it's too late for a vaccine to do you any good. The word Dredd and other characters in the strip are looking for is 'antidote.' Vaccines are generally given to people who aren't already sick in order to prepare their immune systems to recognize a pathogen (i.e. a virus) next time they encounter it, and kill it off.
Dredd must have been delirious as a result of the bite for it to cause him to think 'good thoughts about vegetarians.' It's curious that the category 'vegetarian' even exists in Mega-City One, seeing as meat is relatively hard to come by there and most people seem to eat munce as their main source of protein. Meat-eaters would surely be the exception, wouldn't they?
Still and all, it was a fun story with a few good twists, and I enjoyed it a lot.