“…The extent to which central nervous system involvement occurs in man is not established. Numerous recent investigators, however, have reported nervous manifestations in some or all of their cases of relapsing fever {Hawking, 1941;Hamilton, 1943;Marques, 1943;Scott, 1944;Cattan, Corcos, and Cohen, 1945;Taft and Pike, 1945;Renaud and Regullo, 1946;Aubin, Gachkel, and Gallo, 1947;Bergeret and Raoult, 1948;Heisch, 1950). In contrast to these, Narain and Kalra (1950) report that their Kashmir (India) cases of relapsing fever rarely tend to show evidence of central nervous system involvement.…”