Modelling Streptococcal Urogenital Tract Infection To Study Mechanisms Of Bacterial Colonization And Persistence
Funder
National Health and Medical Research Council
Funding Amount
$412,085.00
Summary
Colonization of the urogenital tract with bacterial pathogens is one of the most common infections in humans. In Australia millions of people are colonized in their urogenital tracts at any given time, often asymptomatically, and many such individuals require medical intervention for the treatment of consequent infections that result from persistent colonization. Bacterial colonization of the urogenital tract is associated with a variety of disease presentations including urinary tract infection ....Colonization of the urogenital tract with bacterial pathogens is one of the most common infections in humans. In Australia millions of people are colonized in their urogenital tracts at any given time, often asymptomatically, and many such individuals require medical intervention for the treatment of consequent infections that result from persistent colonization. Bacterial colonization of the urogenital tract is associated with a variety of disease presentations including urinary tract infections and neonatal infections resulting from vertical transmission of colonizing bacteria from mothers to newborns. Aside from sexually-transmitted diseases the most prominent bacterial pathogens that colonize the urogenital tract are Group B Streptococcus (GBS) and Escherichia coli. GBS in particular exist in the female urogenital tract as a persistent microbial reservoir in up to 40% of pregnant women and are transmitted to newborns in up to 72% of live births. Colonization of newborns leads to invasive disease including pneumonia, sepsis, and meningitis. While the disease presentations resulting from colonization of the urogenital tract vary the underlying basis that leads to disease is antecedent bacterial persistence in the urogenital tract despite immune system activation. The mechanisms whereby GBS evade immune responses in the urogenital tract to allow their survival are unknown. I will define the immune-evasion mechanisms and virulence traits used by GBS, as a model urogenital pathogen, to successfully colonize the urogenital tract in the face of mounting immune responses. These studies will provide a better understanding of the pathogenesis of urogenital disease in terms of bacterial colonization and immune-evasion strategies. This will shed light onto new approaches for the prevention and treatment of urogenital disease in humans such as improved vaccination, locally acting cytokines, and deliberate colonization with non-invasive strains for the prevention of disease.Read moreRead less
Investigation Of The Effects Of Polymicrobial Infection On The Induction Of Otitis Media
Funder
National Health and Medical Research Council
Funding Amount
$235,511.00
Summary
Middle ear infection is a highly prevalent paediatric disease characterised by an inflammation of the middle ear and is the most prevalent illness of childhood. It is reported that greater than 80% of children have had at least one episode of acute otitis media by 3 years of age and almost 40% of children have more than 6 episodes by age 7 years. The cause and pathogenesis of middle ear infection are multifactorial and influence of prevalence and chonicity of the infections. Prevention of bacter ....Middle ear infection is a highly prevalent paediatric disease characterised by an inflammation of the middle ear and is the most prevalent illness of childhood. It is reported that greater than 80% of children have had at least one episode of acute otitis media by 3 years of age and almost 40% of children have more than 6 episodes by age 7 years. The cause and pathogenesis of middle ear infection are multifactorial and influence of prevalence and chonicity of the infections. Prevention of bacterial middle ear infection caused by Streptococcus pneumoniae, nontypeable Haemophilus influenzae and Moraxella catarrhalis requires a much better knowledge of how these bacteria interact with each other and with the host. The poor efficacy of the current pneumococcal paediatric vaccine for preventing middle ear infections highlights this deficiency in our knowledge and will impede the development of a suitable multvalent vaccine to prevent infection by the 3 major bacterial pathogens. This study will investigate how the bacteria colonising the respiratory tract interact during infection and how they affect the host.Read moreRead less
Legionella bacteria are the major cause of Legionnaire’s Disease, a common form of acute pneumonia. Here we will study how the bacteria avoid killing in human cells by establishing an intracellular niche that is sequestered from the normal host cell defence pathways. In particular we hope to understand how the bacteria regulate a major protein modification pathway called ubiquitination.
Multiple Antibiotic Resistance In An Acinetobacter Baumannii Global Clone
Funder
National Health and Medical Research Council
Funding Amount
$606,580.00
Summary
Antibiotic resistant bacteria that cause infections in hospitals can originate anywhere, then spread world wide. They start off resistant to a few antibiotics, then become resistant to new antibiotics that are introduced to treat them. This project will investigate how resistance to antibiotics was acquired by Acinetobacter baumannii which is now resistant to most antibiotics, and why the old resistance genes are not being lost. This will help track these bacteria moving into and around Australi ....Antibiotic resistant bacteria that cause infections in hospitals can originate anywhere, then spread world wide. They start off resistant to a few antibiotics, then become resistant to new antibiotics that are introduced to treat them. This project will investigate how resistance to antibiotics was acquired by Acinetobacter baumannii which is now resistant to most antibiotics, and why the old resistance genes are not being lost. This will help track these bacteria moving into and around Australia.Read moreRead less
Functional Characterisation Of The SseK/NleB Family Of Type III Secreted Effectors In Salmonella And E. Coli
Funder
National Health and Medical Research Council
Funding Amount
$510,183.00
Summary
Salmonella and E. coli cause enteritis and diarrhoea in a large proportion of the world's population including Australia. Certain strains of Salmonella also cause a more serious disease called typhoid fever. Together, diseases caused by Salmonella and E. coli are a major cause of illness and death. In order to cause disease Salmonella and E. coli use a specialised apparatus that functions like a needle and syringe to inject Salmonella proteins into human cells. These proteins that are injected i ....Salmonella and E. coli cause enteritis and diarrhoea in a large proportion of the world's population including Australia. Certain strains of Salmonella also cause a more serious disease called typhoid fever. Together, diseases caused by Salmonella and E. coli are a major cause of illness and death. In order to cause disease Salmonella and E. coli use a specialised apparatus that functions like a needle and syringe to inject Salmonella proteins into human cells. These proteins that are injected into human cells actively reprogram human cells to benefit the disease causing bacteria. We have recently discovered a new family of injected proteins and we aim to determine how these new proteins reprogram human cells and what this contributes to diarrhoea and typhoid fever. This information may lead to the development of more effective treatments for these important diseases.Read moreRead less
E. coli is a normal inhabitant of the human intestine, but some varieties can cause serious infections that may lead to the premature death of children, especially in less developed countries. The aims of this study are to learn more about these harmful varieties of E. coli and to enhance our ability to detect them in samples from patients and the environment.
The Role Of The Chemosensory Receptors Of The Enteric Pathogen C. Jejuni In Virulence And Host - Bacterial Interactions
Funder
National Health and Medical Research Council
Funding Amount
$517,897.00
Summary
Campylobacter jejuni is the greatest cause of bacterial gastroenteritis in the world. Consumption of contaminated meat or untreated water leads to disease often requiring hospitalisation. Campylobacter infection is also linked to the development of neoroparalytic disorders and reactive arthritis. This project aims to determine how this pathogen utilises surface molecules to sense its environment and cause disease. This information may be exploited to develop new treatments for mucosal infections ....Campylobacter jejuni is the greatest cause of bacterial gastroenteritis in the world. Consumption of contaminated meat or untreated water leads to disease often requiring hospitalisation. Campylobacter infection is also linked to the development of neoroparalytic disorders and reactive arthritis. This project aims to determine how this pathogen utilises surface molecules to sense its environment and cause disease. This information may be exploited to develop new treatments for mucosal infections.Read moreRead less
Genomic Approaches To Understand And Control The Emergence Of Vancomycin Resistant Enterococcus Faecium (VREfm) In Australia.
Funder
National Health and Medical Research Council
Funding Amount
$756,163.00
Summary
VRE is a serious hospital superbug that has been increasing in many major hospitals around Australia, while at the same time MRSA (Golden Staph) infections have been decreasing. This project will find out why VRE is increasing by examining what happens to patients at a major Australian hospital from their time of admission to the onset of infection with VRE. At the end of the project we will have the first real understanding of how VRE is transmitted so we can develop effective infection control ....VRE is a serious hospital superbug that has been increasing in many major hospitals around Australia, while at the same time MRSA (Golden Staph) infections have been decreasing. This project will find out why VRE is increasing by examining what happens to patients at a major Australian hospital from their time of admission to the onset of infection with VRE. At the end of the project we will have the first real understanding of how VRE is transmitted so we can develop effective infection control measures.Read moreRead less