Investigation of a Streptococcus viridans pseudobacteremia epidemic at a university teaching hospital.
For several months in 1986, an outbreak of Streptococcus viridans pseudobacteremia occurred at a large teaching hospital. All sources of laboratory blood culture contamination were excluded. A retrospective epidemiological study indicated that one phlebotomist, "P," collected a disproportionate number of the positive blood cultures. Further comparison of the paired blood culture results from the three months when the incidence was highest revealed a good concordance of results among all other phlebotomists (Kappa = 0.5), while P's results concurred with others less frequently than would be expected even by chance (Kappa less than 0.0). Clinical follow-up showed that P did not routinely wear gloves while drawing blood and had eczema of the hands. Skin scrapings from the hands, right index finger/fingernail grew predominantly S viridans species that were compatible with those recovered from contaminated blood cultures. This epidemic demonstrated the need for early detection of this source as a cause of nosocomial pseudobacteremia.
Church
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Department of Microbiology, University of Calgary, Alberta, Canada.
Bryant
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HE
D000416:Alberta; D001800:Blood Specimen Collection; D002353:Carrier State / Q000453:epidemiology; D003428:Cross Infection / Q000453:epidemiology / Q000209:etiology*; D004196:Disease Outbreaks; D006280:Health Workforce; D006784:Hospitals, Teaching; D006801:Humans; D012189:Retrospective Studies; D018805:Sepsis / Q000453:epidemiology / Q000209:etiology*; D013290:Streptococcal Infections / Q000453:epidemiology / Q000209:etiology*