N. A. Gavrilova
St. Petersburg State University of Veterinary Medicine
Russian Federation

N.A. Gavrilova – Dr. Veterinarian Sciences, Prof., Prof. of the Department parasitology named after V.L. Yakimov

V. N. Gaponova
St. Petersburg State University of Veterinary Medicine
Russian Federation

Gaponova V.N. – Candidate of Veterinarian Sciences, Associate professor of the Department of Pathophysiology 

D. E. Levterov
St. Petersburg State University of Veterinary Medicine
Russian Federation

Levterоv D.E. – Candidate of Veterinarian Sciences, Associate professor of
the Department of Pathological Anatomy and Forensic Veterinary Medicine

E. G. Mamaev
FSBI National Park "Commander Islands" named after S.V. Marakov»
Russian Federation

Mamaev E.G. – Candidate of Biological Sciences, Deputy Director. according to scientific. work