About the Authors
Department of Veterinary Biosciences, The Ohio State University, Columbus, Ohio, United States of America
Biocenter, Department of Microbiology, University of Würzburg, Am Hubland, Würzburg, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: HN VKP TR YR. Performed the experiments: HN VKP. Analyzed the data: HN VKP TR YR. Wrote the paper: HN VKP TR YR.