About the Authors

Lene E. Johannessen

Current address: Department of Molecular Biosciences-IMBV, University of Oslo, Oslo, Norway

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Bjørn Spilsberg

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Christer R. Wiik-Nielsen

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Anja B. Kristoffersen

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Arne Holst-Jensen

arne.holst-jensen@vetinst.no

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Knut G. Berdal

Affiliation Norwegian Veterinary Institute, Oslo, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the experiments: LEJ. Conceived and designed the experiments: LEJ BS CRWN AHJ KGB. Wrote the paper: LEJ BS CRWN AHJ KGB. Contributed reagents/materials/analysis tools: LEJ. Analyzed the data: LEJ BS ABK.