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Microcalorimetry: a novel method for detection of microbial contamination in platelet products

Andrej Trampuz1, Simone Salzmann, Jeanne Antheaume

  • 1Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland. atrampuz@uhbs.ch

Transfusion
|August 30, 2007
PubMed
Abstract

Insights

Microcalorimetry can detect low levels of bacterial contamination in platelet products, with detection times as short as 7.5 hours for some species. This method shows promise for improving blood product safety and extending platelet shelf life.

Area of Science:

  • Microbiology
  • Biotechnology
  • Medical Diagnostics

Background:

  • Platelet (PLT) products are susceptible to microbial contamination.
  • Rapid and accurate screening methods are needed to ensure PLT safety.
  • Microcalorimetry offers a potential solution for detecting microbial contamination.

Purpose of the Study:

  • To evaluate the efficacy of microcalorimetry for detecting microorganisms in in vitro contaminated PLT products.
  • To determine the detection limit and time for various microbial species in PLTs using microcalorimetry.

Main Methods:

  • Six common microorganisms were inoculated into single-donor apheresis PLTs at concentrations ranging from 1 to 10(5) CFU/mL.
  • Contaminated PLTs were incubated at 37°C for 5 days in a calorimeter.
  • Positivity was defined by a heat flow of at least 10 microW above baseline.

Main Results:

  • Microcalorimetry detected inocula as low as 10 CFUs/mL for all tested species, with detection times varying by species (e.g., 7.53 hr for E. coli, 73.57 hr for P. acnes).
  • At 10(5) CFUs/mL, detection times were under 4 hours for S. aureus, S. sanguinis, and E. coli.
  • The power-time curve shape was species-specific and independent of initial microbial concentration.

Conclusions:

  • The detection limit for microcalorimetry in PLTs is 1 to 10 CFUs/mL.
  • Microcalorimetry is a promising method for detecting contaminated PLTs.
  • Widespread application could reduce transfusion-related sepsis and extend PLT shelf life.

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