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Rapid test for pathogens developed by K-State researchers
Date:8/21/2008

MANHATTAN, KAN. -- Dangerous disease often spreads faster than it takes to diagnose it in the lab. To remedy that, researchers at Kansas State University have developed a test to bring that time from days down to hours.

Sanjeev Narayanan, assistant professor, and Greg Peterson, research microbiologist, both in the department of diagnostic medicine and pathobiology, use a device called a DNA spotted microarray to seek out the specific genetic markers that set one pathogen apart from another and determine antibiotic resistance.

Traditionally, it takes days and multiple lab workers to screen a sample of soil, water or feces for just one pathogen. Additional time is then needed to look for resistance to antibiotics. The new test developed at K-State simultaneously looks for multiple diseases and antibiotic resistance, reducing the time it takes from sampling to diagnosis to about 24 hours.

"We needed a mass, high through-put system," Narayanan said. "The longer a serious disease goes undiagnosed, the harder it is to treat and the further it can spread."

Narayanan and Peterson have analyzed DNA of hundreds of pathogens and synthesized DNA probes for the specific genetic sequences that set each pathogen apart. So far they can detect as many as 557 genes, making it possible for them to screen for 40 different species of bacteria, 1,200 serotypes of Salmonella, five common serotypes of E. coli, and resistance to the 45 most common antibiotics used to treat human and animal illnesses caused by these pathogens.

When a sample is submitted, technicians extract and fluorescently label total DNA, and run a microarray to check whether a particular gene is present. Narayanan said the next step will be to develop a test that indicates how much of a pathogen is present, or rather how bad an infection is.

Narayanan said that he and Peterson developed the test because most human and animal infections are caused by
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Contact: Sanjeev Narayanan
snaryayan@k-state.edu
785-532-4430
Kansas State University
Source:Eurekalert

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