Fig. 1From: Prevalence of canine heartworm infection in Queensland, Australia: comparison of diagnostic methods and investigation of factors associated with reduction in antigen detectionAntigen test results before and after dissociation of immune complexes by heat treatment of samples for Brisbane (a) and Townsville (b) dogs. For each shelter location positive dogs are represented by crosses and negative dogs by circles. Discordant antigen test pairs are shown as diagonals: filled diagonals represent dogs that are microfilaraemic and hollow diagonals dogs that are amicrofilaraemicBack to article page