Atypical mycobacteria are mycobacteria that do not cause tuberculosis or leprosy. They are found in nature, such as in soil, water, and animals, and may colonize poorly sanitized medical equipment. They can cause various infections in humans, such as skin, soft tissue, lymph node, lung, and disseminRead more
Atypical mycobacteria are mycobacteria that do not cause tuberculosis or leprosy. They are found in nature, such as in soil, water, and animals, and may colonize poorly sanitized medical equipment. They can cause various infections in humans, such as skin, soft tissue, lymph node, lung, and disseminated infections. Some of the most common species of atypical mycobacteria that cause human infections are:
1. Mycobacterium avium complex (MAC)
2. Mycobacterium kansasii
3. Mycobacterium marinum
4. Mycobacterium ulcerans
5. Mycobacterium abscessus complex
6. Mycobacterium chelonae, and
7. Mycobacterium fortuitum
In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test. Gram-positive bacteria take up the crystal violet stain used in the test, and then appear to be purple-coloured when seen through an optical microscope. This is because the thick peptidoglycan laRead more
In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test.
See lessGram-positive bacteria take up the crystal violet stain used in the test, and then appear to be purple-coloured when seen through an optical microscope. This is because the thick peptidoglycan layer in the bacterial cell wall retains the stain after it is washed away from the rest of the sample, in the decolorization stage of the test.