Aeromonas hydrophila infection

Introduction to Aeromonas hydrophila infection Aeromonas hydrophilia diarrhea is an intestinal infectious diarrhea caused by Aeromonas hydrophila (AH). Aeromonas currently has 10 strains, common are Aeromonas hydrophila, Aeromonas guinea (A.caviae, AC), Aeromonas aeruginosa (Asobria, AS) and vulnerable gas bills. A. trota (AT). Among them, the pathogenicity is stronger, Aeromonas hydrophila. basic knowledge The proportion of illness: 0.001% Susceptible people: no special people Mode of infection: non-infectious Complications: dehydration pulmonary edema

The cause of Aeromonas hydrophila infection

(1) Causes of the disease

Aeromonas genus Vibrio, Vilan staining negative, single flagella and motility, no capsule, no spore formation, this bacteria on fish, frogs and other cold-blooded animals and mice, guinea pigs, rabbits and other warm blood Animals are pathogenic. The virulence factors of this bacterium are mainly enterotoxin, including cholera-like toxin (CT) and Escherichia coli-resistant toxin (LT), and some strains are invasive.

(two) pathogenesis

The bacteria are pathogenic to cold-blooded animals such as frogs and fish, and warm-blooded animals, which can produce adhesion factors, have adhesion to intestinal epithelial cells, and can produce heat-labile and heat-labile enterotoxins as well as and . Hemolysin, cytotoxic and other virulence factors, the bacteria can also produce some proteases that cause human disease. Animal experiments show that mice can cause tissue damage, sepsis, endotoxin shock and death after infection.

Prevention of Aeromonas hydrophila infection

Aeromonas hydrophila is mainly transmitted by water, should avoid contact with sewage and drink unboiled or disinfected water; wounds contaminated by natural water should be cleaned and disinfected in time; do not cough when swimming; because the bacteria are also present in fruits and vegetables In the middle, wash before eating; once the epidemic occurs, immediately change the water to change the toilet to prevent further spread of pathogens.

Complications of Aeromonas hydrophila infection Complications dehydration pulmonary edema

Complications include severe dehydration and pulmonary edema.

Symptoms of Aeromonas hydrophila infection Common symptoms Dysentery, low heat meningitis, abscesses

1. The incubation period of acute gastroenteritis is about 1 to 2 days. The symptoms are mild, low fever or no fever. The diarrhea is watery and loose, and there is abdominal pain and no urgency. Individual patients have diarrhea and are similar to cholera. Children under 2 years old can behave as Most cases of dysentery are self-healing in 2 to 5 days, and severe cases can last for 1 to 2 weeks.

2. Trauma infection is caused by skin wounds in contact with river water and sludge. Lighter cases have only local ulcers, and severe cases can cause cellulitis.

3. When patients with sepsis have severe chronic diseases, the bacteria may invade the bloodstream by wounds or intestinal tract, and Aeromonas hydrophila infection may be complicated by infective endocarditis, necrotizing myositis, endoscopic lesions and migratory abscesses. Wait.

4. Other infections can cause postoperative infection, urinary tract infection, acne infection, cholecystitis, peritonitis, pneumonia, meningitis, necrotizing myositis and osteomyelitis.

Examination of Aeromonas hydrophila infection

Regular microscopic examination of the stool showed a small amount of white blood cells and red blood cells, a small number of white blood cells were full of visual field, and the stool cultured positive for Aeromonas hydrophila.

In patients with pneumonia, X-ray chest radiographs were abnormal.

Diagnosis and identification of Aeromonas hydrophila infection

According to abdominal pain, diarrhea, low fever, etc., reference to epidemiological data, combined with fecal culture of positive Aeromonas hydrophila, can make a diagnosis, other types of infection based on clinical manifestations and blood or secretion culture positive diagnosis.

The gastrointestinal type needs to be differentiated from diarrhea caused by other pathogens, and the septic type needs to be differentiated from the fever caused by typhoid and the underlying disease itself.

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