Microbiology Test 3: Chapter 19

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Staphylococcus Aureus

It is found on the skin, upper respiratory, GI, and urogenital tracts

Staphylococcus Aureus

It is more virulent because of production of enzymes and toxins.

Staphylococcus Diseases

It causes actinomycosis which is characterized by the formation of many abscesses connected by channels in the skin or mucous membranes.

Group A Streptococcus

Produces protein M and hyaluronic acid which contributes to virulence. Enzymes and toxins produced dissolve blood clots, stimulate fever, and lyse blood cells.

Viridians Group

Inhabit the mouth, pharynx, GI and genitourinary tracts, can cause cavities, and can enter blood to cause bacteremia and meningitis.

Virulent Strains of Streptococcus Pneumoniae

Protected by polysaccharide capsules and phosphorylcholine in their cell walls.

Enterococcus

Normal microbiota of the intestine that can cause bacteremia, endocarditis, and wound infections.

Bacillus

Secretes anthrax toxin. Anthrax can be found in GI which is rare and fatal, cutaneous which is fatal if untreated, or inhaled which is often fatal.

Listeria

Rarely pathogenic but it can cause severe disease in pregnant women, newborns, the elderly, and immunocompromised patients.

Corynebacterium

Transmitted by respiratory droplets which could cause diphtheria.

Propionibacterium

Causes acne.

Clostridium Perfringens

Produces 11 toxins that lyse blood cells causing food poisoning and gas gangrene.

Clostridium Botulinum

Can release poisonous toxin in canned food. It can also cause infant botulism in the GI tract.

Clostridium Tetani

Enters though broken skin

Mycobacterium Tuberculosis

Cell wall component called cord factor causes tuberculosis where bacteria replicate within macrophages

Mycobacterium Leprae

Progressive destruction of body structures.

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