Microbiology and Immunology 3820A Lecture 14: (Dr. Colby) Lecture 8 - Mycobacteria

• School: Western University
• Department: Microbiology and Immunology
• Course: Microbiology and Immunology 3820A
• Professor: Kelly Summers

Document Summary

(dr. colby) lecture 8 - mycobacteria beef + dairy cattle and into humans (farmers etc), almost never happens. Slender, rod- shaped basically gram + Slow growth, poor staining and acid fastness (ie. once stained, resistant to decolorization) called acid fast. Cell walls 60% lipid, including unique long chain fatty acids called mycolic acids greasy, waxy, difficult to kill. Resistant to physical and chemical disinfectants. Mycobacterium tuberculosis sensostrico (in the strict sense) Mycobacterium bovis bovis is cattle, spread in milk, Mycobacterium africanum from africa. Mycobacterium canettli all capable of causing tb. Mycobacterium microti all capable of causing tb. 1/3 of the worlds population infected including colby. Infection is airborne from active cases coughing true (small particles) airborne, can be carried in air current. Large particles need to be sprayed by sneeze etc. If the sputum stains negative for afb patient is noninfectious cant infect people in neg, pos can infect. Incidence of tb is low in na except in first nations,