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In order to study the importance of an intact thymidine kinase (TK) gene for the vaccine strain of a southern African capripoxvirus, namely, lumpy skin disease virus (LSDV) (type SA-Neethling), a TK disruption recombinant was generated expressing the Escherichia coli beta-galactosidase (lacZ) reporter gene. A comparative growth study of the recombinant and wild-type (wt) LSDV in TK-positive primary and secondary cells and TK-negative secondary cells was performed. It was found that although recombinant and wt virus both grew in TK-positive cells without selection, the recombinant was unable to grow in TK-negative cells (with or without selection), indicating that TK activity is important, if not essential, for normal growth of LSDV.

Importance of thymidine kinase activity for normal growth of lumpy skin disease virus (SA-Neethling)