Mycobacterium Questions and Answers Already Passed

Mycobacterium Questions and Answers Already Passed What is the primary characteristic of Mycobacterium species that distinguishes them from other bacteria? They are acid-fast and have a waxy cell wall. Which lipid is most responsible for the mycobacterial cell wall's resistance to decolorization? Mycolic acid. Which species of Mycobacterium causes leprosy in humans? Mycobacterium leprae. What is the optimal growth temperature for Mycobacterium tuberculosis? 37°C, the temperature of the human body. How long does it typically take for Mycobacterium tuberculosis to form visible colonies on solid media? 3-6 weeks. 2 Which Mycobacterium species is responsible for most non-tuberculous mycobacterial infections in immunocompromised patients? Mycobacterium avium complex (MAC). What type of environment is required for the growth of Mycobacterium tuberculosis in culture? Aerobic conditions with increased CO2 levels. What is the primary reservoir for Mycobacterium leprae? Humans and armadillos. Which test is commonly used to determine if a person has been exposed to Mycobacterium tuberculosis? Tuberculin skin test (TST). What disease is caused by Mycobacterium bovis in humans? Tuberculosis. 3 What characteristic do Mycobacterium species exhibit under a microscope after being subjected to Ziehl-Neelsen staining? They appear as red, rod-shaped organisms against a blue background. What is the primary function of the mycolic acid in Mycobacterium? It provides resistance to desiccation, chemical disinfectants, and antibiotics. Which type of specimens are typically collected to diagnose Mycobacterium tuberculosis infection? Sputum, urine, or gastric lavage. What is the primary mechanism by which Mycobacterium tuberculosis resists the host immune system? It survives and replicates inside macrophages. Which class of antibiotics is most commonly used to treat Mycobacterium tuberculosis infections? First-line drugs, including isoniazid, rifampin, ethambutol, and pyrazinamide. 4 What is the typical presentation of Mycobacterium tuberculosis infection in the lungs? Chronic cough, hemoptysis, and chest pain. Which Mycobacterium species is commonly found in water and soil and can cause pulmonary infections in immunocompromised patients? Mycobacterium avium complex (MAC).