The Grid says
Contagion 2 is officially in the works with an OWA out from Warner Bros. Scott Z. Burns, who wrote the screenplay for the original film, will be producing this time around. It is not yet known whether Steven Soderbergh will return to direct. Contagion was released on September 9th, 2011 and grossed $135 million worldwide.
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Anyhow I don't see how this movie would have a sequel. I thought it was a great film, but very much seemed like one of Soderbergh's experimental entries. They gonna make this the ocean's eleven of end of the world films? Raising the stakes on humanity with each entry until Matt Damon's character calls in George Clooney and Brad Pitt to help him fight back.