Microbiology and Parasitology
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Microbiology and Parasitology

Learn about the characteristics of bacteria, viruses, and their roles in various infections, including skin and eye infections.

Created by
@WittyAlpenhorn

Questions and Answers

What is the main characteristic of prokaryotic cells?

They do not have a true nucleus

What is the composition of the bacterial cell wall?

Peptidoglycan

Which of the following viruses is an example of a DNA virus?

Herpesvirus

What is the mode of transmission for Varicella-Zoster Virus (VZV)?

<p>Airborne and direct contact</p> Signup and view all the answers

What is the primary symptom of ocular herpes caused by Herpes Simplex Virus (HSV)?

<p>Redness, pain, and blurred vision</p> Signup and view all the answers

Which of the following bacteria is an example of a Gram-positive bacterium?

<p>Staphylococcus</p> Signup and view all the answers

What is the replication cycle of viruses?

<p>Attachment, penetration, uncoating, transcription, translation, assembly, release</p> Signup and view all the answers

Which virus causes epidemic keratoconjunctivitis (pink eye)?

<p>Adenovirus</p> Signup and view all the answers

What is the primary mode of transmission for Herpes Simplex Virus (HSV)?

<p>Direct contact with infected secretions</p> Signup and view all the answers

Which of the following is a characteristic of viruses?

<p>They can only replicate inside host cells</p> Signup and view all the answers

Study Notes

Microbiology and Parasitology

Bacteria

  • Prokaryotic cells: no true nucleus, single circular chromosome
  • Cell wall: peptidoglycan (also known as murein)
  • Shapes: spherical (cocci), rod-shaped (bacilli), spiral (spirochaetes)
  • Metabolism: aerobic or anaerobic, autotrophic or heterotrophic
  • Examples:
    • Gram-positive: Staphylococcus, Streptococcus, Bacillus
    • Gram-negative: Escherichia, Klebsiella, Pseudomonas

Viruses

  • Non-living particles, can only replicate inside host cells
  • Consist of genetic material (DNA or RNA) surrounded by protein coat (capsid)
  • Transmission: direct contact, contaminated food and water, vectors (insects)
  • Replication: attachment, penetration, uncoating, transcription, translation, assembly, release
  • Examples:
    • DNA viruses: herpesviruses, adenoviruses, papovaviruses
    • RNA viruses: picornaviruses, flaviviruses, retroviruses

Viral Infections of the Skin

  • Herpes Simplex Virus (HSV)
    • Causes cold sores (HSV-1) and genital herpes (HSV-2)
    • Transmission: direct contact with infected secretions
    • Symptoms: painful blisters, fever, headache
  • Varicella-Zoster Virus (VZV)
    • Causes chickenpox and shingles
    • Transmission: airborne, direct contact
    • Symptoms: itchy rash, fever, headache

Viral Infections of the Eyes

  • Adenovirus
    • Causes epidemic keratoconjunctivitis (pink eye)
    • Transmission: direct contact, contaminated water
    • Symptoms: redness, discharge, swelling, blurred vision
  • Herpes Simplex Virus (HSV)
    • Causes ocular herpes
    • Transmission: direct contact with infected secretions
    • Symptoms: redness, pain, blurred vision, corneal ulcers

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