CULTURAL PROPERTIES OF BOVINE RESPIRATORY SYNCYTIAL VIRUS STRAIN AB1908

Cattle respiratory diseases are some of the most spread pathologies that can cause economic damage, resulting from fi nancial losses and costs of treatment and diagnostics. One of the major factors contributing to respiratory pathology development is bovine respiratory syncytial infection. The analysis of serological testing, performed by the FGBI “ARRIAH” Reference Laboratory for Cattle Diseases in 2017–2018, showed that respiratory syncytial virus seroprevalence in animals of dairy farms is 60%. Herewith, it was noted that the most susceptible animals to this infection are calves under one year of age. The eff ectiveness of bovine respiratory syncytial infection control measures depends on timely diagnosis; that is why reliable and accurate diagnostic tools are needed, including optimal techniques of virus isolation from pathological material. For successful virus isolation from clinical samples, it is necessary to adhere strictly to optimal parameters of this agent cultivation. This paper presents data on study of bovine respiratory syncytial virus strain AB 1908 cultural properties. The tests performed showed that a continuous bovine turbinate (BT) cell line, continuous bovine fetal trachea (FBT) cell line and continuous bovine calf kidney (RBT) cell line are sensitive for cultivation of this agent and can be used to prepare viral suspension, needed for further research. Virus titre in BT cell culture was 4.33 ± 0.16 – 4.66 ± 0.12 lg TCID50/ cm³, in RBT cell culture – 4.33 ± 0.33 – 4.7 ± 0.36 lg TCID₅₀/cm³ and in FBT cell culture – 4.13 ± 0.20 – 4.78 ± 0.17 lg TCID₅₀/cm³. The following virus cultivation optimal parameters were also determined during this study: the age of the culture for virus inoculation should be 1–2 days and multiplicity of inoculation should be 0.1 TCID₅₀/cell.

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