Generation of infectious retrovirus aerosol through medical laser irradiation

Lasers in Surgery and Medicine
B L ZieglerL Weber

Abstract

A novel model system was used to investigate the spread of infectious particles and live cells through the application of lasers commonly used in clinical medicine. Supernatants from a cell line producing recombinant retroviruses carrying a marker gene (neoR) were exposed to Er:YAG-laser beams. Aerosols were collected from various sites and distances from the point of laser impact and were analyzed by reverse transcription-polymerase chain reaction (RT-PCR) for neoR. In addition, a susceptible indicator cell line was used to investigate the presence of infectious virions in collected aerosols. To test the possibility of dissemination of viable cells, a cell line was laser irradiated, and the generated aerosols were analyzed for the presence of viable cells. The viral marker gene neoR could be detected in 16% (distance: 5.0-6.3 cm) to 59% (0.5-1.6 cm) of wells adjacent to the point of laser impact. The presence of infectious viruses in laser vapors conferring G418 resistance could be detected in 3% (distance 5.0-6.3 cm) to 20% (distance: 0.5-1.6 cm) of wells containing susceptible cells, and subsequent PCR analysis of isolated resistant clones revealed the presence of neoR-RNA and -DNA. Viable cells were detected in 40% (distanc...Continue Reading

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