Is Rhodococcus acid fast?
Is Rhodococcus acid fast?
Rhodococcus equi is an aerobic Gram-positive and acid-fast coccobacillus that may cause cavitary pneumonia in immunocompromised hosts such as HIV-infected patients.
Is Rhodococcus equi gram-positive or negative?
Microbiology. Rhodococcus (Corynebacterium) equi is a gram-positive, encapsulated, intracellular bacillus, varying from coccoid to long and club-shaped.
What type of microbe is Rhodococcus equi?
Rhodococcus equi is a Gram-positive coccobacillus bacterium. The organism is commonly found in dry and dusty soil and can be important for diseases of domesticated animals (horses and goats)….
| Rhodococcus equi | |
|---|---|
| Domain: | Bacteria |
| Phylum: | “Actinobacteria” |
| Class: | Actinobacteria |
| Order: | Mycobacteriales |
What is the shape of Rhodococcus?
Rhodococcus equi (formerly Corynebacterium equi) is a gram-positive, encapsulated, intracellular bacillus that varies in shape from coccoid to long and club shaped.
What is special about mycobacteria?
Mycobacteria are immobile, slow-growing rod-shaped, gram-positive bacteria with high genomic G+C content (61-71%). Due to their special staining characteristics under the microscope, which is mediated by mycolic acid in the cell wall, they are called acid-fast. This is also the reason for the hardiness of mycobacteria.
How is Mycobacterium transmitted?
M. tuberculosis is transmitted through the air, not by surface contact. Transmission occurs when a person inhales droplet nuclei containing M. tuberculosis, and the droplet nuclei traverse the mouth or nasal passages, upper respiratory tract, and bronchi to reach the alveoli of the lungs (Figure 2.2).
What causes Rhodococcus equi?
Rhodococcus equi is a bacterium that inhabits the soil and can cause pneumonia in foals aged 1 to 6 months. Disease in adult horses, people, and other animals is rare and often associated with a deficiency of the immune system, such as people infected with HIV or undergoing cancer chemotherapy. Infection with R.
What is the genus name of Rhodococcus?
Rhodococcus is a genus of aerobic, nonsporulating, nonmotile Gram-positive bacteria closely related to Mycobacterium and Corynebacterium.
What does Rhodococcus equi look like?
Rhodococcus (Corynebacterium) equi is a gram-positive, encapsulated, intracellular bacillus, varying from coccoid to long and club-shaped. R. equi produces small, white, mucoid colonies initially, which become large, salmon-colored colonies on standard media in approximately 4 days.
What is the pathophysiology of Rhodococcus pneumonia?
Rhodococcus pneumonia is a zoonotic infection that causes a nodular histiocytic and cavitary pneumonia in immunosuppressed patients, most commonly with HIV/AIDS (Fig. 8.48 ). 54 The causative gram-positive cocci are easily identified ( Fig. 8.49A) and also stain positive with the modified Ziehl-Neelsen stain (see Fig. 8.49B ).
What is Rhodococcus fascians?
The genus Rhodococcus has two pathogenic species: R. fascians and R. equi. The former, a plant pathogen, causes leafy gall disease in both angiosperm and gymnosperm plants.
