Blue light destroys resistant staph infection

January 30th, 2009 - 8:40 pm ICT by IANS  

Washington, Jan 30 (IANS) Two common strains of methicillin-resistant Staphylococcus aureus, commonly known as MRSA, were eliminated by exposure to a wavelength of blue light. Antibiotic-resistant bacterial infections represent an important and increasing public health threat. Approximately 40 to 50 percent of Staph aureus isolated have developed resistance to newer semi-synthetic antibiotics such as methicillin as well.

C.S. Enwemeka, Deborah Williams, S.K. Enwemeka, Steve Hollosi and David Yens from the New York Institute of Technology had previously demonstrated that photo-irradiation using 405-nanometres (nm) of light destroys MRSA strains grown in culture.

In the current study, the authors exposed bacterial colonies of MRSA to various doses of 470-nm light, the shortest wavelength of blue light that emits no ultraviolet radiation.

They reported that the higher the dose of 470-nm blue light, the more bacteria were killed. High-dose photo-irradiation was able to destroy 90.4 percent of the US-300 colonies and the IS-853 colonies.

These findings suggest that blue light should also be effective in human cases of MRSA infection, said a New York Institute release.

These findings have appeared online in Photomedicine and Laser Surgery.

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