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Τι (ποιος) είναι Vibrio fetus - ορισμός
.jpg?width=200 "Children in Mpape community play in a waste water drainage area. This drainage was the suspected source of contamination of the well water that led to the cholera outbreak investigated by Nigeria FELTP residents in April 2014. Two samples collected from home wells around this drainage tested positive for Vibrio Cholerae.")
![Diagram of the human [[fetal circulatory system]]](https://commons.wikimedia.org/wiki/Special:FilePath/Fetal circulation.png?width=200 "Diagram of the human [[fetal circulatory system]]")
![A human fetus, attached to [[placenta]], at three months gestational age](https://commons.wikimedia.org/wiki/Special:FilePath/Fetus 3 months.jpg?width=200 "A human fetus, attached to [[placenta]], at three months gestational age")
![gestational age]])](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasound_image_of_a_fetus.jpg?width=200 "gestational age]])")
Βικιπαίδεια
Vibrio cholerae is a species of Gram-negative, facultative anaerobe and comma-shaped bacteria. The bacteria naturally live in brackish or saltwater where they attach themselves easily to the chitin-containing shells of crabs, shrimp, and other shellfish. Some strains of V. cholerae are pathogenic to humans and cause a deadly disease called cholera, which can be derived from the consumption of undercooked or raw marine life species.
V. cholerae was first described by Félix-Archimède Pouchet in 1849 as some kind of protozoa. Filippo Pacini correctly identified it as a bacterium and from him, the scientific name is adopted. The bacterium as the cause of cholera was discovered by Robert Koch in 1884. Sambhu Nath De isolated the cholera toxin and demonstrated the toxin as the cause of cholera in 1959.
The bacterium has a flagellum at one pole and several pili throughout its cell surface. It undergoes respiratory and fermentative metabolism. Two serogroups called O1 and O139 are responsible for cholera outbreaks. Infection is mainly through drinking contaminated water, therefore is linked to sanitation and hygiene. When ingested, it invades the intestinal mucosa which can cause diarrhea and vomiting in a host within several hours to 2–3 days of ingestion. Oral rehydration solution and antibiotics such as fluoroquinolones and tetracyclines are the common treatment methods.
V. cholerae has two circular DNA. One DNA produces the cholera toxin (CT), a protein that causes profuse, watery diarrhea (known as "rice-water stool"). But the DNA does not directly code for the toxin as the genes for cholera toxin are carried by CTXphi (CTXφ), a temperate bacteriophage (virus). The virus only produces the toxin when inserted into the bacterial DNA.
Quorum sensing in V. cholerae is well studied and it activates host immune signaling and prolongs host survival, by limiting the bacterial intake of nutrients, such as tryptophan, which further is converted to serotonin. As such, quorum sensing allows a commensal interaction between host and pathogenic bacteria.
