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Wednesday, January 27 • 11:40am - 12:00pm
Can Vaccinated Hatchery Fish Be Used To Prevent Disease Spread? A Case Study of VHS Ivb

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AUTHORS: Lori Ivan*, Michigan State University; Travis Brenden, Michigan State University; Mohamed Faisal, Michigan State University; Isaac Standish, Michigan State University

ABSTRACT: Viral hemorrhagic septicemia genotype IVB (VHSV IVb) is a serious finfish pathogen that emerged in the Great Lakes region in the early 2000s and subsequently has led to numerous mass mortality events in both the Great Lakes and inland waterbodies. There have been previous and ongoing efforts to develop a vaccine to protect fish against VHSV IVb. We developed a spatially-explicit, individual-based model (IBM) to determine the feasibility of eliciting a herd immunity response in wild fish populations in the Great Lakes through the vaccination and release of hatchery fish. Despite its low susceptibility to VHSV IVb, we used Chinook salmon in Lake Michigan as our model species due to the wealth of biological, ecological, and population dynamic information available for the species. Model evaluations included varying the assumed susceptibility of Chinook salmon to VHS-IVb so that results could be considered in the context of other species that are more susceptible to the virus. The IBM modeled Chinook salmon foraging, growth, movement, mortality, maturation, and wild reproduction. Chinook salmon disease states consisted of vaccinated, susceptible, infected, and shedding. Infections occur by occupying areas with high densities of individuals shedding the virus. Infected individuals either die or become shedders themselves, with the shedding period lasting from 14 to 84 days. Recovered fish are immune from further infections, although there is a small chance that recovered individuals will again start shedding the virus. As part of this research, we will be exploring how different vaccination strategies (e.g., number of vaccinated individuals, release locations) and attributes of the vaccine (e.g., effectiveness) and at-large populations (e.g., susceptibility) interact to influence vaccination effectiveness in protecting at-large populations.

Wednesday January 27, 2016 11:40am - 12:00pm EST
Pearl