University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

377

Pages:

2
Author:

Mariam A. A.

Microbiology Define the relationship between organisms Commensalism: Benefit, other unaffected Mutualism: Both benefit Parasitism: One benefits, other harmed Opportunism: Normally harmless, but causes disease in a non-normal site Two types of microorganisms: Eukaryotes, prokaryotes Viruses: Single type of nucleic acid Protein coat (capsid) Rely on host cell machinery No enzymes of their own Bacteria: Prokaryotes Two types: Eubacteria & archaea Classified based on Gram stain Gram-positive: Thick cell wall, purple stain Gram-negative: Thin cell wall, pink stain No nuclear membrane Cell wall: Peptidoglycan Have enzymes of their own Fungi: Eukaryotes Multicellular Cell wall: Chitin Heterotrophic Reproduce asexually or sexually Normal Flora vs. Pathogenic Microorganisms Normal Flora: No disease under normal conditions Is lodged in the body's internal organs, tissues, and fluids Types of Infections: Primary: Acute infection → inhal illness Secondary: Due to opportunistic microorganisms of primary infection Subclinical: No noticeable illness Extent of Host Involvement: Localized: Confined to a specific tissue Focal: Effects in other parts of the body Systemic: Spread to several sites, tissues, fluids, and bloodstream