Listeriosis, Biology


The disease is caused by Listeria monocytogenes - Gram positive small non spore- forming bacilli seen in soil, silage, sewage and feces of animals and birds. These bacteria can survive outside the host for several years but are susceptible to pasteurization and certain antimicrobials. The clinical symptoms are not specific. There is depression, ataxia and torticollis. The gross lesions observed are focal hepatic necrosis, spleenomegaly with military necrosis, nephritis, enteritis, myocarditis and conjunctivitis. In acute cases the only lesion seen are congestion of the viscera and petechial haemorrhages on several organs.

Definite diagnosis is based on isolation and identification of the bacteria from blood, liver, spleen or brain. Isolation may require pre-incubation of the macerated materials at 4oC for several days or weeks. Isolation of the organism can also be attempted in chicken embryos.  Potential source of infection should be avoided with biosecurity measures.

Posted Date: 9/18/2012 8:36:02 AM | Location : United States

Related Discussions:- Listeriosis, Assignment Help, Ask Question on Listeriosis, Get Answer, Expert's Help, Listeriosis Discussions

Write discussion on Listeriosis
Your posts are moderated
Related Questions
Q. What is Biological Contaminants? You may recall reading about food borne diseases caused by the consumption of contaminated food items in the last unit. In the

Mental Health For physiological health & social status, it is necessary to maintain mental health. Mental illness is characterised by - Depression Insomnia Exces

How will the plant-incorporated protectants rules change EPA's current registration process? The rules clarify which plant-incorporated protectants are needed to be evaluated u

Define Soy Protein Concentrates? The Association of American Feed Control Officials, Inc. (AAFCO) specifies soy protein concentrates as follows: "Soy Protein Concentrate is pre

Health Hazards with poor management of Bio-medical waste Health hazards associated with poor management of Bio-medical waste are: - Injury from sharps to staff and waste han

Cancer Lung Incidence of cancer lung is more in persons who smoke. Environmental and industrial pollution is also a risk factor in the increase in incidence. Clinic

family ,genus, class order , species of mollusca

Where in the body is the thyroid gland located? The thyroid is located in the anterior cervical region (frontal neck), in front of the trachea and just below the larynx. It is

F a c t o r s responsible for transboundary diseases Factors that affect the entry, establishment and spread of animal diseases include globalization; human population gr

If we make a cross of two phenotypically WT zebrafish, and we get the following results, what can we say about the genotype of those two WT looking parents from the following resul