RT Journal Article SR Electronic T1 Epidemiology in search of infectious diseases: methods in outbreak investigation. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 311 OP 314 DO 10.1136/jech.43.4.311 VO 43 IS 4 A1 Palmer, S R YR 1989 UL http://jech.bmj.com/content/43/4/311.abstract AB