title: Investigation of a waterborne outbreak of giardiasis using serologic testing by IFA.
mesh_terms: D004196:Disease Outbreaks / Q000453:epidemiology; D004812:Epidemiologic Methods; D005455:Fluorescent Antibody Technique; D005872:Giardia / Q000302:isolation & purification*; D005873:Giardiasis / Q000469:parasitology*; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000469:parasitology*; D014707:Vermont; D014881:Water Supply