Staphylococcus bacteria are found on the skin, in sores, infected eyes and in the nose, throat, saliva and bowel of humans, yellow mucus (slimy substance) from the nose when a person has a cold or a lung infection ,Salmonella. found mainly in the intestines, bowels and faeces of humans and other animals .Clostridium bacteria are found in the soil and in the intestines of animals, including cattle, poultry, fish and humans. These bacteria are common in the environment., Campylobacter bacteria are found in many animals including dogs, cats, cattle and poultry. The sources of infection from these bacteria are usually contaminated food and water.

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