Ashish Mishra, who was remanded in police custody on Friday, was moved to the Lakhimpur jail late last night after test results confirmed that he had contracted dengue.
Thirteen people, including Ashish Mishra, have so far been arrested in connection with the incident.
After his arrest on October 9, Ashish Mishra was first remanded to police custody on October 11 with the remand period starting on October 12 and ending on October 15.