Histoplasmosis: A disease caused by the fungus Histoplasma capsulatum. Most people with histoplasmosis have no symptoms. However, histoplasma can cause acute or chronic lung disease and progressive disseminated histoplasmosis affecting a number of organs. It can be fatal if untreated.
Positive skin tests to Histoplasma occur in as many as 80% of the people living in areas where the fungus is common, such as the eastern and central United States. Infants, young children, and older persons, in particular those with chronic lung disease, are at increased risk for severe disease. Disseminated disease is more frequently seen in people with cancer or AIDS or those on drugs that suppress the immune system, such as Remicade or steroids.
Brucellosis is an infectious disease caused by a type of bacteria called Brucella. The bacteria can spread from animals to humans.
There are several different strains of Brucella bacteria. Some types are seen in cows. Others occur in dogs, pigs, sheep, goats, and camels. Recently, scientists have seen new strains in the red fox and certain marine animals, including seals. Brucella in animals cannot be cured.
Brucellosis is rare in the U.S. because of effective animal disease control programs...
The fungus grows in soil and material contaminated with bat or bird droppings. Spores become airborne when contaminated soil is disturbed. Breathing the spores causes infection. The disease is not transmitted from an infected person to someone else.
Symptoms start within three to 17 days after exposure; the average is 10 days. The acute respiratory disease is characterized by respiratory symptoms, a general ill feeling, fever, chest pains, and a dry or nonproductive cough. Distinct patterns may be seen on a chest X-ray. Chronic lung disease resembles tuberculosis and can worsen over months or years. The disseminated form is fatal, unless treated.
Mild cases resolve without treatment. Severe cases of acute histoplasmosis and all cases of chronic and disseminated disease are treated with antifungal medications, sometimes for life in those with compromised immune systems.