10/31/2022 0 Comments Pacific news centerThe most common form of transmission of Legionella is inhalation of contaminated aerosols from contaminated water. They can cause infections by infecting human cells using a similar mechanism to that used to infect protozoa. Legionella can survive and grow as parasites within free-living protozoa and within biofilms which develop in water systems. The bacteria live and grow in water systems at temperatures of 20 to 50 degrees Celsius (optimal 35 degrees Celsius). However, artificial water systems which provide environments conducive to the growth and dissemination of Legionella represent the most likely sources of disease. pneumophila, which is found in natural aquatic environments worldwide. The most common cause of illness is the freshwater species L. The causative agents are Legionella bacteria from water or potting mix. The likelihood of illness depends on the concentrations of Legionella in the water source, the production and dissemination of aerosols, host factors such as age and pre-existing health conditions and the virulence of the particular strain of Legionella. The infective dose is unknown but can be assumed to be low for susceptible people, as illnesses have occurred after short exposures and 3 or more kilometres from the source of outbreaks. It has since been associated with outbreaks linked to poorly maintained artificial water systems. pneumophila was first identified in 1977 as the cause of an outbreak of severe pneumonia in a convention centre in the USA in 1976. longbeachae can be found in potting mixes. Legionella pneumophila and related species are commonly found in lakes, rivers, creeks, hot springs and other bodies of water. Worldwide, waterborne Legionella pneumophila is the most common cause of cases including outbreaks. Legionellosis varies in severity from a mild febrile illness to a serious and sometimes fatal form of pneumonia and is caused by exposure to the Legionella bacteria species found in contaminated water and potting mixes.Ĭases of legionellosis are often categorized as being community, travel or hospital acquired based on the type of exposure.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |