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(TMZ) - Lindsay Lohan is in a London hospital with a rare, incurable virus she apparently picked up in Bora Bora, TMZ has learned. 

TMZ reports Lindsay contracted Chikungunya, a virus transmitted by mosquito bites that causes fever, joint pain and fatigue.  

Lindsay vacationed in Bora Bora over the holidays and then flew to L.A. to shoot an Esurance commercial -- that TMZ suggests could be for the Super Bowl. 

According to TMZ, Lindsay began complaining of the illness just before New Year's. She then went back to London where she became so ill she couldn't walk. 

TMZ reports Lindsay is currently in King Edward VII's Hospital ... the same place the Queen gets treated. They're keeping Lindsay because she has a high fever and the joint pain is unbearable.

As for her prognosis ... TMZ says the joint pain could last for months.

Lindsay in Bora Bora:

A photo posted by Lindsay Lohan (@lindsaylohan) on

Photo: Getty Images