5 Cultures of microorganisms for medical and veterinary use, namely, genetically modified microorganisms that express interfering molecules that inhibit the expression of target genes; Biological preparations for the treatment of infectious diseases in animals, namely, biotheraputics consisting of genetically modified microorganisms that express RNA-based therapeutic agents that inhibit the expression of target animal pathogen genes; Biological preparations for the treatment of infectious diseases in plants, namely, biotheraputics consisting of genetically modified microorganisms that express RNA-based therapeutic agents that inhibit the expression of target plant pathogen genes; Biological preparations for the treatment of viral infections in plants, namely, biotheraputics consisting of genetically modified microorganisms that express RNA-based therapeutic agents that inhibit the expression of target viral pathogen genes; Biological preparations for the treatment of bacterial infections in animals, namely, biotheraputics consisting of genetically modified microorganisms that express RNA-based therapeutic agents that inhibit the expression of target bacterial pathogen genes; Biological preparations for the treatment of fungal diseases, namely, biotheraputics consisting of genetically modified microorganisms that express RNA-based therapeutic agents that inhibit the expression of target fungal pathogen genes; Cultures of microorganisms for medical or veterinary use, namely, genetically modified microorganisms for use in therapeutic treatment of pathogens in animals, namely, microorganisms that express RNA-based therapeutic agents that inhibit the expression of target pathogen genes; Probiotic preparations for medical or veterinary use, namely, probiotic compositions for use in therapeutic treatment of pathogens in animals, namely, genetically engineered bacteria that express RNA-based therapeutic agents to inhibit the expression of target pathogen genes; Cultures of microorganisms for medical or veterinary use, namely, genetically modified enteric bacteria for use in therapeutic treatment of pathogens in animals; Medical, biological and pharmaceutical preparations for the prevention and treatment of infectious diseases in plants and animals; biological RNA-based therapeutic agents for the prevention and treatment of infectious diseases in plants and animals; Cultures of microorganisms for medical or veterinary use, namely, biological RNA-based therapeutic agents that inhibit the expression of target genes in plant pests and herbivores