Parker Posey has been diagnosed with Lyme Disease. The 40-year-old star has pulled out of an off-Broadway play, called "This," to focus on battling her tick-borne illness.

Lyme Disease is treatable if diagnosed early, as it has been for Posey. If left untreated, bacteria can lead to severe brain and heart problems.

Producers of "This" plan to go ahead with the play in November, but have yet to name Posey's replacement.

See more photos of Parker Posey here!

Image © Sylvain Gaboury / PR Photos

(This news article provided by World Entertainment News Network)