The troops were clearing landmines in the dense forests of Narayanpur district when they were attacked.
Four of the soldiers were in “a real bad state” with serious swelling on their faces and hands, police said.
The men have been admitted to a local government hospital.
The area contains dense forests and has been the scene of a bitter Maoist insurgency, police and local officials told the BBC.
Insects and reptiles pose a major problem for the security forces deployed against the Maoists in the forests of Chhattisgarh, Jharkhand and Orissa.
According to rough estimates, malaria and insects kill as many security personnel as die in combat against Maoist rebels.
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