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Salmonella strains are often named after where they were first isolated. All strains can occur epizootically, enzootically and sporadically. The strains can all produce similar clinical signs. Infection is via the faecal- oral route and organisms penetrate enterocytes before crossing the mucosa and entering macrophages. After entering macrophages, organins may then either remain localised to the gut, or are carried round the body to cause disease. There are 2 main types of disease; '''septicaemic''' and '''enteric'''. Each outbreak causes only one type of disease. The type of disease is linked to serotype- some serotyopres produce septicaemia, whereas others remain localised in the gut.
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Salmonella strains are often named after where they were first isolated. All strains can occur epizootically, enzootically and sporadically. The strains can all produce similar clinical signs. Infection is via the faecal- oral route and organisms penetrate enterocytes before crossing the mucosa and entering macrophages. After entering macrophages, organins may then either remain localised to the gut, or are carried round the body to cause disease. There are 2 main types of disease; '''septicaemic''' and '''enteric'''. Each outbreak causes only one type of disease. The type of disease is linked to serotype- some serotypes produce septicaemia, whereas others remain localised in the gut.
    
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