Aeromonas hydrophila

Aeromonas hydrophila

Taxobox | color = lightgrey
name = "Aeromonas hydrophila"

domain = Bacteria
regnum = Proteobacteria
phylum = Gammaproteobacteria
classis = Aeromonadales
genus = "Aeromonas"
species = "A. hydrophila"
binomial = "Aeromonas hydrophila"
binomial_authority = (Chester, 1901)
Stanier, 1943
synonyms = "Bacillus hydrophilus fuscus" Sanarelli 1871
"Bacillus hydrophilus" Chester 1901
"Proteus hydrophilus" (Chester 1901) Bergey et al. 1923
"Bacterium hydrophilum" (Chester 1901) Weldin and Levine 1923
"Pseudomonas hydrophila" (Chester 1901) Breed et al. 1948

"Aeromonas hydrophila" is a heterotrophic, gram-negative bacterium, mainly found in areas with a warm climate. This bacterium can also be found in fresh, salt, marine, estuarine, chlorinated, and un-chlorinated water. "Aeromonas hydrophila" can survive in aerobic and anaerobic environments. This bacterium can digest materials such as gelatin, and hemoglobin. "Aeromonas hydrophila" was isolated from humans and animals until the 1950s. This bacterium is the most well known of the six species of Aeromonas. It is also very hard to kill, because it is a very resistant bacterium. "Aeromonas hydrophila" is resistant to chlorine, refrigeration or cold temperatures.


"Aeromonas hydrophila" are Gram-negative straight rods with rounded ends(bacilli to coccibacilli shape). They usually grow from .3 to 1 micrometer in width, and 1 to 3 micrometers in length. "Aeromonas hydrophila" does not form endospores, and can grow in temperatures as low as four degrees Celsius. These bacteria are motile by a polar flagella.


Because of "Aeromonas hydrophila’s" structure, it is very toxic to many organisms. When it enters the body of its victim, it travels through the bloodstream to the first available organ. It produces Aerolysin Cytotoxic Enterotoxin (ACT), a toxin that can cause tissue damage. It is known as a pathogenic bacterium. Aeromonas hydrophila, Aeromonas caviae, and Aeromonas sobria are all considered to be “opportunistic pathogens,” meaning they only infect hosts with weakened immune responses. Though "Aeromonas hydrophila" is considered a pathogenic bacterium, scientists not been able to prove that it is the actual cause of some of the diseases it is associated with. It is believed that this bacterium aids in the infection of diseases, but do not cause the diseases themselves.

Occurrence of exposure

"Aeromonas hydrophila" infections occur most during environmental changes, stressors, change in the temperature, in contaminated environments, and when an organism is already infected with a virus or another bacterium. It can also be ingested through food products that have already been infected with the bacterium, such as seafood, meats, and even certain vegetables such as sprouts.

Fish and amphibians

"Aeromonas hydrophila" is associated with diseases mainly found in fish and amphibians, because these organisms live in aquatic environments. It is linked to a disease found in frogs called red leg, which causes internal, sometimes fatal hemorrhaging. When infected with Aeromonas hydrophila, fish develop ulcers, tail rot, fin rot, and hemorrhagic septicaemia. Hemorrhagic septicaemia causes lesions that lead to scale shedding, hemorrhages in the gills and anal area, ulcers, exophthalmia, and abdominal swelling.

Human diseases

"Aeromonas hydrophila" is not as pathogenic to humans as it is to fish and amphibians. One of the diseases it can cause in humans is gastroenteritis. This disease can affect anyone, but it occurs most in young children and people who have compromised immune systems or growth problems. This bacterium is linked to two types of gastroenteritis. The first type is a disease similar to cholera, which causes rice-water diarrhea. The other type of disease is dysenteric gastroenteritis, which causes loose stools filled with blood and mucus. Dysenteric gastroenteritis is the most severe out of the two types, and can last for multiple weeks. Aeromonas hydrophila is also associated with cellulitis, an infection that causes inflammation in the skin tissue. It also causes diseases such as myonecrosis and eczema in people with compromised immune systems.


Though "Aeromonas hydrophila" can cause serious diseases, there have never been serious outbreaks. There was an outbreak inside the intestinal tract of lizards in Puerto Rico. There were 116 different strains found in the lizards. On May 1 1988 there was a small "Aeromonas hydrophila" outbreak in California. There were 225 isolates and 219 patients admitted in the hospital because of the bacterium. Confidential Morbidity Report cards were used to report the cases of the bacterium to the local health departments. Investigations were conducted, and reports were sent to the California department of health services for diagnosis and methods in treatment.


Though "Aeromonas hydrophila" is very resistant to the common methods used to kill most bacteria, it can be eliminated. It can be killed using one percent sodium hypochlorite solution and two percent calcium hypochlorite solution.

Chemotherapeutic agents such as chloramphenicol, florenicol, tetracycline, sulfonamide, nitrofuran derivatives, and pyrodinecarboxylic acids are used to eliminate and control the infection of "Aeromonas hydrophila". Terramycin is placed in fish food during hatchery operations as another chemotherapeutic agent in preventing "Aeromonas hydrophila".

Preventing infection

It is ill-advised to transfer fish from hatchery to hatchery without any sanitation. Hatchery workers should clean the fish, and check for bacterial infection between each operation. To avoid contamination oxygen levels in fish should be maintained, and fish should always be handled gently, to avoid injury. Prophylactic treatments can also be used when trying to prevent "Aermonas hydrophila". These treatments include disinfectants and Acriflavin.


*Fulton, MacDonald. [ "The Bacterium "Aeromonas hydrophila" from Lizards of the genus "Anolis" in Puerto Rico".] Louisiana State University Medical Center, New Orleans.
*Hayes, John. [ "Aeromonas hydrophila"."] Oregon State University.
*Arrow Scientific. [ "Aeromonas hydrophila"."]
* [ "Aeromonas hydrophila"."] Bad Bug Book Foodborne Pathogenic Microorganisms and Natural Toxins Handbook.
* [ "Aeromonas hydrophila" and Related Bacteria."] International Specialty Supply.

External links

* [ "Aeromonas hydrophila ATCC7966"]

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