Salmonella in poultry: improving vaccine efficacy . The central aim of this project is to increase the antigenicity of aroA mutant Salmonella Typhimurium vaccines, in particular Bioproperties’ Vaxsafe® ST. Increased antigenicity will affect the gut microbiota and stimulate a stronger host immune response improving vaccine efficacy and the duration of protection against S. Typhimurium in poultry. This will ultimately reduce bacterial loads in the farm environment, mitigate downstream contaminatio ....Salmonella in poultry: improving vaccine efficacy . The central aim of this project is to increase the antigenicity of aroA mutant Salmonella Typhimurium vaccines, in particular Bioproperties’ Vaxsafe® ST. Increased antigenicity will affect the gut microbiota and stimulate a stronger host immune response improving vaccine efficacy and the duration of protection against S. Typhimurium in poultry. This will ultimately reduce bacterial loads in the farm environment, mitigate downstream contamination of the food supply chain, and reduce the number of human salmonellosis cases.Read moreRead less
Molecular approaches to solving current and emerging problems in the epidemiology and diagnosis of Marek's disease in Australia. Marek's disease (MD) is a ubiquitous viral disease of chickens that is currently controlled in meat chickens by blanket vaccination of all chickens. However, as has happened overseas, the efficacy of the HVT vaccine being used in Australia is breaking down resulting in subclinical and clinical losses due to MD. To assist industry deal with this situation we propose to ....Molecular approaches to solving current and emerging problems in the epidemiology and diagnosis of Marek's disease in Australia. Marek's disease (MD) is a ubiquitous viral disease of chickens that is currently controlled in meat chickens by blanket vaccination of all chickens. However, as has happened overseas, the efficacy of the HVT vaccine being used in Australia is breaking down resulting in subclinical and clinical losses due to MD. To assist industry deal with this situation we propose to develop novel molecular methods for the quantification of Marek's disease viruses (MDV) in the host and the environment, to use these methods to design effective early monitoring systems for MD in broilers that predict disease and performance outcomes, and to develop an epidemiological model that will predict the spread and severity of MD as failure of vaccinal protection progresses.Read moreRead less
Virulence determinants influencing re-emergence of a complex RNA virus. This project intends to examine the effects that specific genes in naturally occurring recombinants have on their capacity to cause disease and spread between chickens. Coronaviruses are major pathogens of domestic animals throughout the world. Recurrent re-emergence of the coronavirus of chickens, infectious bronchitis virus, has been associated with recombination between wild type viruses and vaccine viruses, but the facto ....Virulence determinants influencing re-emergence of a complex RNA virus. This project intends to examine the effects that specific genes in naturally occurring recombinants have on their capacity to cause disease and spread between chickens. Coronaviruses are major pathogens of domestic animals throughout the world. Recurrent re-emergence of the coronavirus of chickens, infectious bronchitis virus, has been associated with recombination between wild type viruses and vaccine viruses, but the factors influencing this, and in particular the selective advantages genes from vaccine viruses confer on these recombinants, are unknown. The ultimate aim of the project is to identify both novel vaccines and alternative management strategies that might reduce the frequency of re-emergence of this virus and other coronaviruses.Read moreRead less
Avoiding the immune response: lessons from 'simple' bacteria. Some of the most important bacterial diseases of domestic animals are caused by mycoplasmas. Improved control of these diseases would significantly improve agricultural productivity by reducing losses associated with reduced feed conversion efficiency and increased susceptibility to other diseases, as well as improve animal welfare and public health, by reducing the need for antibiotic therapy to control these diseases in food produci ....Avoiding the immune response: lessons from 'simple' bacteria. Some of the most important bacterial diseases of domestic animals are caused by mycoplasmas. Improved control of these diseases would significantly improve agricultural productivity by reducing losses associated with reduced feed conversion efficiency and increased susceptibility to other diseases, as well as improve animal welfare and public health, by reducing the need for antibiotic therapy to control these diseases in food producing animals.Read moreRead less
Development of an Attenuated Infectious Laryngotracheitis Virus Vaccine. This project will develop novel methods for identification of genes involved in virulence of the important avian pathogen Infectious Laryngotracheitis Virus and produce an attenuated, antigenically marked infectious laryngotracheitis virus vaccine strain by specific disruption and deletion of two or more genes in the virusÕs genome.
Infectious laryngotracheitis is a major disease of chickens throughout the world, but curre ....Development of an Attenuated Infectious Laryngotracheitis Virus Vaccine. This project will develop novel methods for identification of genes involved in virulence of the important avian pathogen Infectious Laryngotracheitis Virus and produce an attenuated, antigenically marked infectious laryngotracheitis virus vaccine strain by specific disruption and deletion of two or more genes in the virusÕs genome.
Infectious laryngotracheitis is a major disease of chickens throughout the world, but current vaccines retain some capacity to cause disease. The development of novel attenuated vaccines will thus enhance control of this important disease of poultry.Read moreRead less
Functional identification of vaccine targets in pathogenic mycoplasmas. Mycoplasmas are important bacterial pathogens in domestic animals that are incompletely controlled by current vaccines. As a result current control measures for the diseases they cause rely on ongoing treatment with antibiotics. This project will aim to use functional genomics and metabolomics to determine the function of specific surface proteins of a model mycoplasma to identify targets for novel approaches to vaccines aga ....Functional identification of vaccine targets in pathogenic mycoplasmas. Mycoplasmas are important bacterial pathogens in domestic animals that are incompletely controlled by current vaccines. As a result current control measures for the diseases they cause rely on ongoing treatment with antibiotics. This project will aim to use functional genomics and metabolomics to determine the function of specific surface proteins of a model mycoplasma to identify targets for novel approaches to vaccines against these pathogens, and to then assess the potential for inclusion of these proteins in vaccines. Ultimately this will lead to improved vaccines against these important pathogens, improving agricultural productivity and reducing the use of antibiotics in intensively raised livestock.Read moreRead less
Optimising the efficacy of mycoplasma vaccines in the field. Optimising the efficacy of mycoplasma vaccines in the field. This project intends to examine the effect of antibiotic treatment, killed vaccines and immunosuppressive viruses on the protective immunity induced by a model novel vaccine against the important poultry pathogen Mycoplasma gallisepticum. The continued circulation of pathogenic mycoplasmas in intensively managed animals is a major animal health problem. Live attenuated vaccin ....Optimising the efficacy of mycoplasma vaccines in the field. Optimising the efficacy of mycoplasma vaccines in the field. This project intends to examine the effect of antibiotic treatment, killed vaccines and immunosuppressive viruses on the protective immunity induced by a model novel vaccine against the important poultry pathogen Mycoplasma gallisepticum. The continued circulation of pathogenic mycoplasmas in intensively managed animals is a major animal health problem. Live attenuated vaccines could reduce disease, but we have limited understanding of the best conditions for their use. This project will generate data to guide both use and development of live mycoplasma vaccines. It is expected to have significant impacts on animal health, welfare and production, and public health by reducing the use of antibiotics to control mycoplasmoses.Read moreRead less
Alphaherpesvirus vaccination, recombination and latency; a study in the natural host. Attenuated alphaherpesvirus vaccines are used widely in production and companion animals to help control disease. These vaccines help to prevent clinical signs of disease following challenge with virulent viruses. There is also the potential to use these vaccines to help prevent latent herpesvirus infections, and to limit the opportunities for herpesvirus recombination to occur. This would enhance the ability t ....Alphaherpesvirus vaccination, recombination and latency; a study in the natural host. Attenuated alphaherpesvirus vaccines are used widely in production and companion animals to help control disease. These vaccines help to prevent clinical signs of disease following challenge with virulent viruses. There is also the potential to use these vaccines to help prevent latent herpesvirus infections, and to limit the opportunities for herpesvirus recombination to occur. This would enhance the ability to control disease in animal populations. This project aims to systematically study how vaccines may be used to limit latency and recombination events by studying avian infectious laryngotracheitis virus in the natural host leading to new insights into how vaccines may be used more efficaciously.Read moreRead less
Molecular approaches to limit herpesvirus recombination. This project aims to generate safer attenuated herpesvirus vaccines for use in veterinary medicine by genetically manipulating the herpesvirus genome to reduce virus recombination. Recombination is recognised as a safety concern for a range of attenuated herpesvirus vaccines. This project is expected to generate viruses that have an impaired capacity to recombine with other viruses. These viruses will then be tested as candidate vaccines f ....Molecular approaches to limit herpesvirus recombination. This project aims to generate safer attenuated herpesvirus vaccines for use in veterinary medicine by genetically manipulating the herpesvirus genome to reduce virus recombination. Recombination is recognised as a safety concern for a range of attenuated herpesvirus vaccines. This project is expected to generate viruses that have an impaired capacity to recombine with other viruses. These viruses will then be tested as candidate vaccines for use in veterinary medicine. This offers a new approach to developing safer veterinary vaccines that will benefit our important animal industries.Read moreRead less
Linking immunomodulation and latency in alphaherpesvirus infection. Herpesviruses cause major diseases in humans and all domestic animal species. Latency forms a significant part of the evolutionary success of herpesviruses, by enabling transmission of the virus throughout the lifetime of the host. Our work has shown that an alphaherpesvirus protein can divert the host’s immune response to become more antibody-mediated and less T cell-mediated. This study explores the consequences of this immune ....Linking immunomodulation and latency in alphaherpesvirus infection. Herpesviruses cause major diseases in humans and all domestic animal species. Latency forms a significant part of the evolutionary success of herpesviruses, by enabling transmission of the virus throughout the lifetime of the host. Our work has shown that an alphaherpesvirus protein can divert the host’s immune response to become more antibody-mediated and less T cell-mediated. This study explores the consequences of this immune diversion, and examines whether this reduced T cell response enables the development of latent infections. Disrupting the virus-host balance by alterations to this conserved viral protein will enable novel approaches to controlling these economically significant viruses.Read moreRead less