Targeted screening as a tool for the early detection of chronic Q fever patients after a large outbreak

Eur J Clin Microbiol Infect Dis. 2013 Mar;32(3):353-9. doi: 10.1007/s10096-012-1749-9. Epub 2012 Sep 26.

Abstract

In the aftermath of the Dutch Q fever outbreak, an increasing number of patients are being diagnosed with chronic Q fever. Most of these patients are unaware of being infected with Coxiella burnetii, the causative agent of Q fever. To find patients in an earlier, asymptomatic stage, a targeted screening strategy (TSS) for patients with risk factors for chronic Q fever was started in the southeast region of Noord-Brabant. In total, 763 patients were tested using an IgG phase II indirect fluorescent antibody test (IFAT), of which 52 (7 %) patients tested positive. Ten of these 52 patients displayed a chronic Q fever serological profile. All of these 10 patients had a heart valve(s) or (endo-)vascular prosthesis. All except one were asymptomatic. Suggestive signs for chronic infections on positron emission tomography-computed tomography (PET-CT) were demonstrated in 5 (50 %) of these patients. Forty-two out of the 52 patients with a positive screening test showed a past Q fever serological profile. After a year of follow-up (every 3 months), none of these patients showed elevation of antibody titres and no new chronic Q fever patients were found in this group. A targeted screening programme is a useful instrument for detecting patients at risk of developing chronic Q fever.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Antibodies, Bacterial / blood*
  • Coxiella burnetii / immunology*
  • Disease Outbreaks*
  • Female
  • Fluorescent Antibody Technique / methods
  • Humans
  • Immunoglobulin G / blood
  • Male
  • Mass Screening / methods*
  • Middle Aged
  • Netherlands / epidemiology
  • Prevalence
  • Q Fever / diagnosis*
  • Q Fever / epidemiology*

Substances

  • Antibodies, Bacterial
  • Immunoglobulin G