FRDC 2015-015: Aquatic Animal Health Subprogram: Determining the susceptibility of Australian Penaeus monodon and P. merguiensis to newly identified enzootic.

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FRDC 2015-015: Aquatic Animal Health Subprogram: Determining the susceptibility of Australian Penaeus monodon and P. merguiensis to newly identified enzootic (YHV7) and exotic (YHV8 and YHV10) Yellow head virus (YHV) genotypes. AUSTRALIAN ANIMAL HEALTH LABORATORY (AAHL) Nick Moody | Team Leader, Aquatic Diagnostic Capability Ridley Australian Prawn & Barramundi Farmers Symposium – 2 August 2016

Project Update YHV infectivity trials

FRDC 2015-015 PI: Nick Moody, AFDL, Geelong CI: Mark Crane, AFDL, Geelong Start Date: 01-07-15 End Date: 03-06-17 FRDC funds: $159,941 Objectives No. Details 1 Determine the susceptibility of P. monodon and P. merguiensis to YHV-complex Genotype 7 (YHV7) 2 Determine the susceptibility of P. monodon and P. merguiensis to YHV-complex Genotype 8 (YHV8) 3 Determine the susceptibility of P. monodon and P. merguiensis to YHV-complex Genotype 10 (YHV10) 4 Transfer protocols and controls for diagnostic tests to state diagnostic laboratories YHV infectivity trials

FRDC 2015-015 Infectivity trial: November, 2015 1: Sequenced as Wenzhou shrimp virus-1 2: Sequence similarity with HPV2 and HPV3 from Madagascar 3: Sequence similarity of 96% with Australian HPV YHV infectivity trials

FRDC 2015-015 YHV1 is pathogenic to P. monodon and P. merguiensis by inoculation YHV infectivity trials

FRDC 2015-015 YHV7 is pathogenic to P. monodon by inoculation YHV infectivity trials

FRDC 2015-015 YHV8 is not pathogenic to P. monodon and P. merguiensis by inoculation YHV infectivity trials

FRDC 2015-015 YHV10 is not pathogenic to P. monodon and P. merguiensis by inoculation (inoculum also had YHV8 in it) YHV infectivity trials

FRDC 2015-015 YHV infectivity trials

Conclusions Demonstrated pathogenicity of YHV1 to Australian P. monodon and P. merguiensis (by inoculation) Demonstrated pathogenicity of YHV7 to Australian P. monodon (by inoculation) YHV2 (GAV) in host P. monodon and YHV7 inoculum did not appear to have any effect on the prawns (temperature too low: 24  1C?) Generated material for feeding and co-habitation trials Redo YHV10 inoculation with additional material from imported prawns obtained after the November 2015 trial Seeking prawns for infectivity trials in October/November 2016 YHV infectivity trials

Acknowledgements APFA, Tony Charles Prawn farms that sent us the prawns (confidentiality) FRDC AAHBS CSIRO AAHL AAHL Fish Diseases Laboratory YHV infectivity trials

Thank you Nick Moody Team Leader, Aquatic Diagnostic Capability Senior Research Scientist t +61 3 5227 5749 e nick.moody@csiro.au AUSTRALIAN ANIMAL HEALTH LABORATORY (AAHL)