Er:YAG Laser Irradiation Induces Behavioral Changes in V. harveyi

Idan Redenski*, Sharonit Sahar-Helft, Adam Stabholz, Doron Steinberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Objective: Laser technologies have many different applications in medical, agricultural, and industrial fields. Studies have shown several effects of laser energy on different bacterial species, in a wide variety of settings. Recent reports have found that one of the unique features of bacteria is their ability to communicate among themselves (quorum sensing). We sought to investigate whether low-energy laser irradiation affects bacterial behavior, which is regulated by quorum sensing. Methods: Laser irradiations were performed using Er:YAG laser (2940 nm wavelength) at output powers of 0.5, 1.5, 2.5, and 4 W on wild-type Vibrio harveyi. Bioluminescence, motility, and biofilm forming capability were assessed on the bacteria after irradiation. Results: After irradiation of bacteria, positive dose/output power dependencies were found in the bioluminescence omitted from tested experimental groups. Motility of colonies on semi-solid media was inhibited as irradiation output power was increased. However, after irradiation, biomass analysis of biofilm samples showed negligible differences between the irradiated samples and controls. Conclusions: Results indicate the impact of low-energy laser irradiation on bacterial behavior such as quorum sensing and motility, without affecting bacterial growth patterns.

Original languageAmerican English
Pages (from-to)164-170
Number of pages7
JournalPhotomedicine and Laser Surgery
Issue number3
StatePublished - Mar 2017

Bibliographical note

Publisher Copyright:
© Copyright 2017, Mary Ann Liebert, Inc. 2017.


  • biofilm
  • laser
  • quorum sensing


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