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Scientists create NICE solution to pneumonia vaccine testing problems
Date:10/22/2009

Medical clinics the world over could benefit from new software* created at the National Institute of Standards and Technology (NIST), where a team of scientists has found a way to improve the efficiency of a pneumonia vaccine testing method developed at the University of Alabama at Birmingham (UAB).

Pneumonia is the world's leading cause of death in children under five years of age and poses a serious risk to elderly adults. The leading cause of pneumonia worldwide is the pneumococcus bacterium, which also causes meningitis, sepsis and other complications. Pneumococcus has more than 90 strains that vary by geographic region and change over time. Consequently, ongoing testing is necessary to monitor existing vaccines and advance new ones.

One novel, high-throughput testing method involves culturing the bacteria along with a vaccinated person's blood serum and human white blood cells. If the vaccine is effective, the white cells kill the pneumococci and very few of the bacteria survive. Scientists can determine the vaccine's effectiveness by counting the number of surviving pneumococcus colonies, so rapid, accurate and standardized counting of these colonies is critical to this testing method.

At present, the most commonly used counting process is manual counting, which is both time-consuming and exhausting. "Automated counting devices do exist, but they require customized image acquisition methods, are very expensive and are not accessible in impoverished or developing regions of the world. These limiting factors can mean the difference between life and death," says NIST biophysicist Jeeseong Hwang. "So we created software that can be tweaked to work on any common imaging device."

The open-source software, called NIST's Integrated Colony Enumerator (NICE), takes a digital image that has been loaded into a computer and counts colonies grown from single pneumococcal cells. The Microsoft Windows-based software works on imag
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Contact: Chad Boutin
boutin@nist.gov
301-975-4261
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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