Because influenza immunization, with its commonly accompanying fever, is not associated with an increased risk of worsening of MS1,2 (1976;236:1965), we have considered the hot bath test to be safe. We look forward to the data of Drs Berger and Sheremata on the relative risk of permanent worsening of MS from hot baths.
Goren H, Malhotra AS. The Hot Bath Test and Multiple Sclerosis-Reply. JAMA. 1982;247(7):979. doi:10.1001/jama.1982.03320320019016