MicrobeWorld

There is no doubt that filmgoers love sequels. The adulation is so great that in 2011, nine of the top 10 grossing films were continuations of cinematic storylines. For studios, a sequel is usually easy money as success is almost guaranteed with only a small evolution in the characters and plotlines as well as an environment full of hype.

Germs are also very good at producing sequels although their return is significantly less thrilling to the general public. The reoccurrence of a pathogen can be a rather unpleasant experience to health officials and epidemiologists who have to take time and money to investigate yet another outbreak from a bacterium or virus that had been thought beaten and yet somehow returned. But this year has seen one of the most troublesome comebacks in years and there appears to be no end in sight.

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