Pathophysiology: Legionnaires’ disease is a serious lung infection caused by Legionella bacteria. Legionnaires' disease, also known as legionellosis or Legion fever. Over 90% of cases of Legionnaires' disease are caused by Legionella pneumophila. These bacterial species can be water-borne or present in soil, whereas L. pneumophila has only been found in aquatic systems, where it is symbiotically present in aquatic-borne amoebae. It thrives in temperatures between 25 and 45 °C (77 and 113 °F), with an optimum temperature of 35 °C (95 °F).
Treatment: People of any age may suffer from Legionnaires' disease, but the illness most often affects middle-aged and older persons, particularly those who smoke cigarettes or have chronic lung disease. Immunocompromised people are also at higher risk. Pontiac fever most commonly occurs in persons who are otherwise healthy. A significant under-reporting problem occurs with legionellosis. Even in countries with effective health services and readily available diagnostic testing, about 90 percent of cases of Legionnaires' disease are missed.
Statistics: Of the more than 500 febrile events that were investigated by the health department these three months, 50 were laboratory confirmed for the bacterial disease. “Most of them received outpatient treatment with a good outcome,”a health ministry spokesperson said. However, three fatalities were reported: one in Santa Fe, one in Chabás and third in Rosario. In addition, nearly 150 cases of suspected hantavirus were investigated and five cases were confirmed.