An experimental investigation on aspects of infectious salmon anaemia virus (ISAV) infection dynamics in seawater Atlantic salmon, Salmo salar L.

Journal of Fish Diseases - Tập 32 Số 6 - Trang 481-489 - 2009
A Gregory1, L A Munro1, Valeria Riccieri1, Katy Urquhart1, Alexander G. Murray1, R. S. Raynard1
1Fisheries Research Services, Aberdeen, UK.

Tóm tắt

AbstractThis study investigated infection dynamics of infectious salmon anaemia virus (ISAV) by conducting two experiments to examine minimum infective dose and viral shedding of ISAV. In terms of minimum infective dose, the high variability between replicate tanks and the relatively slow spread of infection through the population at 1 × 101 TCID50 mL−1 indicated this dose is approaching the minimum infective dose for ISAV in seawater salmon populations. A novel qPCR assay incorporating an influenza virus control standard with each seawater sample was developed that enabled the quantity of ISAV shed from infected populations to be estimated in values equivalent to viral titres. Viral shedding was first detected at 7 days post‐challenge (5.8 × 10−2 TCID50 mL−1 kg−1) and rose to levels above the minimum infective dose (4.2 × 101 TCID50 mL−1 kg−1) on day 11 post‐challenge, 2 days before mortalities in ISAV inoculated fish started. These results clearly demonstrate that a large viral shedding event occurs before death. Viral titres peaked at 7.0 × 101 TCID50 mL−1 kg−1 15 days post‐infection. These data provide important information relevant to the management of ISA.

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Thông tin xuất bản

Journal of Fish Diseases

Tập 32 Số 6

481-489

Thông tin tác giả