Abstract: The present invention provides a method of treating a solid tumour in a subject, the method comprising the following steps (i) delivering to the solid tumour a composition comprising an engineered ovine atadenovirus; and (ii) administering a prodrug to the subject, wherein the engineered ovine atadenovirus comprises a promoter and a gene encoding an enzyme which converts the prodrug to a cytotoxic metabolite, the gene being under control of the promoter.

Abstract: A soluble form of the neutralizing antigen or rotavirus is provided. The antigen is formed by cloning DNA coding for VP7 protein into an expression vector and preparing deletion mutants coding for a soluble cell secreted neutralizing antigen. The preparation of the deletion mutants includes the removal of the DNA sequences coding for those amino acids of the VP7 protein responsible for its normal intracellular location and non-secretion characteristics. The deletion mutant may be used in the formation of stably transformed animal cell lines which contiuously secrete the antigen, or in the production of certain yeast strains which produce the soluble antigen with appropriate glycosylation.