Legionnaires' disease Legionnaires' disease Legionnaires' disease, also known as legionellosis, is a form of atypical pneumonia caused by any type of "Legionella" bacteria. Signs and symptoms include cough, shortness of breath, high fever, muscle pains, and headaches. Nausea, vomiting, and diarrhea may also occur. This often begins 2-10 days after exposure. The bacterium is found naturally in fresh water. It can contaminate hot water tanks, hot tubs, and cooling towers of large air conditioners. It is usually spread by breathing in mist that contains the bacteria. It can also occur when contaminated water is aspirated. It typically does not spread directly between
Sociality and disease transmission Sociality and disease transmission The effects of how social grouping strategies may reduce or increase the spread of disease is critical for the health of large groups of people. Places with large amounts of human interaction have a high risk for disease transmission. Social groups, community structures, and different cultures have different strategies and behaviors of reducing the spread of disease. Animals groups and humans that live in a place with high population density have an increased risk of disease prevalence. Some ways that large groups can help reduce the spread of disease is to have clean water supply and