 |
|
|
|
Year 2014 - Volume 34, Number 9
|
|
Escherichia coli pathotypes associated with diarrhea in calves: an update, 34(9):811-818
|
ABSTRACT.- Coura F.M., Lage A.P. & Heinemann M.B. 2014. [Escherichia coli pathotypes associated with diarrhea in calves: an update.] Patotipos de Escherichia coli causadores de diarreia em bezerros: uma atualização. Pesquisa Veterinária Brasileira 34(9):811-818. Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária da Universidade de São Paulo, Av. Prof. Dr. Orlando Marques de Paiva 87, Cidade Universitária, São Paulo, SP 05508-270, Brazil. E-mail: marcosbryan@usp.br
Diarrhea is one of the most frequent diseases in calves up to 30 days of age and is a major cause of economic losses. Its etiology is complex and involves the interaction of various infectious, nutritional, immunological, environmental and managerial factors. The main clinical signs are diarrhea, progressive dehydration, metabolic acidosis, electrolyte imbalance and negative energy balance with or without hypoglycemia, which if left untreated, results in death of the animal. Escherichia coli stands as an important enteropathogen involved in diarrheal syndrome. Pathogenic E. coli strains are classified into groups or pathotypes based on the production of virulence factors and on the mechanisms by which they cause diarrhea. There are five E. coli pathotypes associated with diarrhea in calves: enterotoxigenic E. coli (ETEC), enteropathogenic E. coli (EPEC), enterohemorrhagic E. coli (EHEC), Shiga toxin – producing E. coli (STEC) and necrotoxigenic E. coli (NTEC). In this article, we present the main characteristics and an update on E. coli pathotypes causing calf diarrhea. |
| |
|
|
| |
|
|
