Henry Heimlich M.D., to William L. Roper M.D. MPH, re: CDC memo of 1990-01-19 from David T. Dennis, M.D., MPH, Chief, Bacterial Zoonoses Branch, DVBID NCID CDC and Carlos C. Campbell M.D. MPH, Chief, Malaria Branch, DPD NCID CDC to state and territorial epidemiologists, re: malariatherapy for Lyme disease (1991-04-24)