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Table 2 Apparent and true prevalence for canine heartworm antigen positivity of dogs from northern and southern Queensland, Australia

From: Multiple diagnostic tests demonstrate an increased risk of canine heartworm disease in northern Queensland, Australia

Location Apparent prevalence (95% confidience interval, n) True prevalence
Northern QLD 20.0% (9.7–36.2%, 35) 8.0–29.1%
Southern QLD 5.4% (2.4–10.9%, 130) 0.0–7.0%
Overall QLD 8.5% (5.0–13.8%, 165) 0.0–11.0%
  1. The test results are based on combined unheated and heat-treated plasma testing. Sensitivity and specificity values used were chosen from previously published reports as follows: 0.88, 0.95; 0.77, 0.85; 0.90, 0.96; 0.86, 0.97; 0.77, 1; 0.85, 1; 0.71, 0.94; 0.63, 0.97 [9, 22,23,24,25]