The Roles Of Lipoprotein Multigene Families In Pathogenesis Of Mycoplasma Pneumoniae
Funder
National Health and Medical Research Council
Funding Amount
$257,036.00
Summary
Mycoplasma pneumoniae is one of the most common causes of community acquired pneumonia. Although it can usually be successfully treated with antibiotics, it can result in more severe diseases and can be difficult to diagnose accurately. It has been identified as a target for vaccine development, but this has been hampered by the limited understanding we have of how it causes disease. The attempts at vaccination that have been made have resulted in vaccines which induced more severe, rather than ....Mycoplasma pneumoniae is one of the most common causes of community acquired pneumonia. Although it can usually be successfully treated with antibiotics, it can result in more severe diseases and can be difficult to diagnose accurately. It has been identified as a target for vaccine development, but this has been hampered by the limited understanding we have of how it causes disease. The attempts at vaccination that have been made have resulted in vaccines which induced more severe, rather than less severe, disease. Investigations of several other related bacteria have shown that they are able to vary their surface proteins and thus may evade the immune system, permitting them to cause more prolonged disease. Better understanding how this occurs, and what this enables the bacteria to do, may assist in developing improved vaccine strategies. This project aims to investigate the six gene families in Mycoplasma pneumoniae which are known to encode surface proteins and establish how and why the bacteria switch from one gene to another during infection. In addition the capacity of bacteria expressing different versions of the six surface proteins to adhere to different tissues will be investigated. Once this is known, these mechanisms may be able to be specifically disrupted to prevent a strain of Mycoplasma pneumoniae from being able to establish prolonged infections. Such a strain might be a useful basis for an effective vaccine.Read moreRead less
The Pathogenesis Of Melioidosis: The Interaction Of Burkholderia Pseudomallei With Host Cells.
Funder
National Health and Medical Research Council
Funding Amount
$344,375.00
Summary
Melioidosis is an often fatal disease of mainly tropical Australia and SE Asia caused by a bacterium which is found in soil and water. Infection occurs via wounds or by inhalation. Melioidosis has recently become endemic in south-west Western Australia and south-eastern Queensland, and could represent an emerging disease worldwide. Melioidosis disproportionately affects Aboriginal Australians. Melioidosis has many forms including septicemia with damage to most organs, particularly lung, spleen a ....Melioidosis is an often fatal disease of mainly tropical Australia and SE Asia caused by a bacterium which is found in soil and water. Infection occurs via wounds or by inhalation. Melioidosis has recently become endemic in south-west Western Australia and south-eastern Queensland, and could represent an emerging disease worldwide. Melioidosis disproportionately affects Aboriginal Australians. Melioidosis has many forms including septicemia with damage to most organs, particularly lung, spleen and liver, acute localised suppurative infection and pneumonia. Melioidosis may also become latent, and later develop into an acute and fatal infection. It is important to understand, at the molecular level, how and why the causative bacterium is able to cause disease. Only with such an understanding can measures be undertaken to prevent the disease, or novel methods developed to control the disease. Colonisation of a host is a first step in the disease process for all bacteria which cause disease. Large protein molecules located on the surface of disease-causing bacteria are usually neccessary for colonisation of the host since they allow adherence to the surface of host cells. We have previously undertaken a basic study of adherence. This study will build on this research with the aim of identifying molecules which mediate adherence to host cells, using in vivo and in vitro methods, including the techniques of molecular biology. This study will inevitably lead to the development of vaccine candidates which is important to the management of melioidosis, particularly in high risk groups. It may also allow the development of novel antimicrobial compounds.Read moreRead less
EFFECTIVENESS OF INFLUENZA AND PNEUMOCOCCAL VACCINATION IN PREVENTING HOSPITALISATION DUE TO PNEUMONIA IN OLDER PERSONS
Funder
National Health and Medical Research Council
Funding Amount
$258,475.00
Summary
Flu and pneumococcus remain important causes of illness and death in Australia. They can cause pneumonia and severe respiratory illness, including death, especially in older people. This is because natural immunity against infections tends to decrease with age. Vaccination against flu and pneumococcus is therefore recommended for all persons aged 65 years or older, but only in Victoria are both vaccines publicly funded. The Victorian initiative appears to have had a marked impact on improving va ....Flu and pneumococcus remain important causes of illness and death in Australia. They can cause pneumonia and severe respiratory illness, including death, especially in older people. This is because natural immunity against infections tends to decrease with age. Vaccination against flu and pneumococcus is therefore recommended for all persons aged 65 years or older, but only in Victoria are both vaccines publicly funded. The Victorian initiative appears to have had a marked impact on improving vaccination coverage, but its impact on disease has never been assessed. This study will estimate vaccination coverage, missed vaccination opportunities, effectiveness of flu and pneumococcal vaccines in preventing hospitalisation for pneumonia, and cost-effectiveness of the currently funded vaccination program in this age group. This is considered a priority because of the serious but preventable nature of the diseases caused by these infections. This study will improve awareness of the importance of vaccination among individuals, and given the high estimated vaccine coverage in older Victorians, is well placed to provide the first available evidence for or against effectiveness and cost-effectiveness of flu and pneumococcal vaccination in older Australians. The results may have major implications for public health policy in Victoria and elsewhere in Australia.Read moreRead less
Characterisation Of Extracellular DNases Of Pseudomonas Aeruginosa And Their Contribution To Disease
Funder
National Health and Medical Research Council
Funding Amount
$418,516.00
Summary
The bacterium Pseudomonas aeruginosa causes a number of serious diseases of humans particularly of immunocompromised patients. We have found that this bacterium secretes enzymes that have the ability to digest DNA. This proposal aims to work out how this bacterium uses these enzymes to infect human tissues and escape killing by immune cells. The results from this study will help to determine if these proteins may be used as targets for the development of new anti-infective drugs.
A Prospective Study Of The Aetiology, Associations, Clinical Features And Outcomes Of Community-acquired Pneumonia In Children And Adults In Tropical Australia
Funder
National Health and Medical Research Council
Funding Amount
$106,937.00
Summary
Pneumonia is common in Australia and often requires hospital admission. The germs that cause pneumonia in tropical Australia are less well known than southern Australia and likely to be different. This study will identify which germs cause pneumonia in people in tropical Australia and will identify which people become more unwell. I aim to identify the best antibiotics to use, the differences between children and adults, Indigenous and non-Indigenous people and people living in different areas.
A Novel CD39-like Ecto-NTPDase Of Legionella Pneumophila
Funder
National Health and Medical Research Council
Funding Amount
$362,046.00
Summary
Legionnaire's disease is a serious cause of community acquired pneumonia. We are studying the way the Legionella bacteria persist in the environment and cause disease. We have found that Legionella produces a specific protein that mimics the action of a human protein. This proposal aims to work out how the bacteria use this protein to infect the human lung and escape killing by immune cells. The results from this study will help to determine if this protein may be used as a target for the develo ....Legionnaire's disease is a serious cause of community acquired pneumonia. We are studying the way the Legionella bacteria persist in the environment and cause disease. We have found that Legionella produces a specific protein that mimics the action of a human protein. This proposal aims to work out how the bacteria use this protein to infect the human lung and escape killing by immune cells. The results from this study will help to determine if this protein may be used as a target for the development of new anti-infective drugs.Read moreRead less
Preventing Illness And Death From Severe Influenza In Australia
Funder
National Health and Medical Research Council
Funding Amount
$1,719,110.00
Summary
Influenza and its complications are a common cause of hospitalisation and death. However, influenza is a moving target, with viruses constantly mutating from season to season. My research programme will transform the prevention and treatment of influenza and its complications by developing innovative public health and treatment strategies that can be applied globally. The work will optimise vaccine and treatment strategies to reduce illness and deaths from influenza.