Jump to full article: ScienceDaily, 2009-11-19
Intro: Cigarettes are "widely contaminated" with bacteria, including some known to cause disease in people, concludes a new international study conducted by a University of Maryland environmental health researcher and microbial ecologists at the Ecole Centrale de Lyon in France.
The research team describes the study as the first to show that "cigarettes themselves could be the direct source of exposure to a wide array of potentially pathogenic microbes among smokers and other people exposed to secondhand smoke." Still, the researchers caution that the public health implications are unclear and urge further research.
"We were quite surprised to identify such a wide variety of human bacterial pathogens in these products," says lead researcher Amy R. Sapkota, an assistant professor in the University of Maryland's School of Public Health.
"The commercially-available cigarettes that we tested were chock full of bacteria, as we had hypothesized, but we didn't think we'd find so many that are infectious in humans," explains Sapkota, who holds a joint appointment with the University's Maryland Institute for Applied Environmental Health and the department of epidemiology and biostatistics.
"If these organisms can survive the smoking process -- and we believe they can -- then they could possibly go on to contribute to both infectious and chronic illnesses in both smokers and individuals who are exposed to environmental tobacco smoke," . . .
The study will appear in an upcoming edition of the journal Environmental Health Perspectives. . . .
Sapkota's team took a more holistic approach using DNA microarray analysis to estimate the so-called bacterial metagenome, the totality of bacterial genetic material present in the tested cigarettes.
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Quotes from this article:
The commercially-available cigarettes that we tested were chock full of bacteria, as we had hypothesized, but we didn't think we'd find so many that are infectious in humans. If these organisms can survive the smoking process -- and we believe they can -- then they could possibly go on to contribute to both infectious and chronic illnesses in both smokers and individuals who are exposed to environmental tobacco smoke.
Lead researcher Amy R. Sapkota, an assistant professor in the University of Maryland's School of Public Health, on the study that will appear in an upcoming edition of the journal Environmental Health Perspectives.
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