Micro Recap - Doctor 2017 - JU Medicine · Escherichia, Salmonella Shigella, Vibrio, Campylobacter,...

Micro Recap

Various chapters

Oxidase = these bugs are treated as strict AEROBES Oxidase: an enzyme used for oxidation reduction (cytochrome C, its presence means that the bacteia uses oxygen as a strict electron acceptor and thus is a strict anaerobe (much like psudomonas)

Gram-Negative Rods Related to the Respiratory Tract

• H. influenzae and B. pertussis are found only in humans, whereas L. pneumophila is found primarily in environmental water sources.

NON–SPORE-FORMING GRAM-POSITIVE RODS • There are two important pathogens in this group:

• 1 Corynebacterium diphtheriae

• 2 Listeria monocytogenes

Diarrhea with blood

Gradual fever, turns into weakness and constipation, then green colored diarrhea with complications

Notice lactose fermenters are causative of UTI Proteus a non lactose fermenter also causes UTI,

it is characterized by high motility

HUS

Typhoid

VIBRIO • V. cholerae cause of cholera.

• Vibrio parahaemolyticus causes diarrhea associated with eating raw or improperly cooked seafood. Vibrio vulnificus cellulitis and sepsis.

• The major human pathogens in this family are : Mycobacterium tuberculosis, the cause of tuberculosis, and Mycobacterium leprae, the cause of leprosy.

• Atypical mycobacteria, such as Mycobacterium avium-intracellulare complex and Mycobacterium kansasii, can cause tuberculosis-like disease but are less frequent pathogens.