Viral+infections

Viral Infections Overview

  • Understanding viral infections involves comprehending terms and specific viruses associated with various diseases in humans. Here's a detailed overview of major viral infections, their diseases, modes of transmission, and special characteristics.

Terms Associated with Viruses

  • Intracellular: Viruses must enter host cells to replicate.

  • Spikes: These are protein structures on the virus surface, aiding in attachment to host cells.

  • Reverse Transcription: Some viruses, like HIV, convert RNA into DNA during their replication cycle.

  • Oncogenic: Refers to viruses that can cause cancer.

Common Viral Infections

1. Ebola Virus

  • Disease: Hemorrhagic fever

  • Mode of Transmission: Direct contact with infected blood

  • Origin: Typically originates in bats

2. Epstein-Barr Virus

  • Diseases: Infectious Mononucleosis, Burkitt's Lymphoma, nasopharyngeal cancer

  • Mode of Transmission: Saliva and direct contact with infected persons

  • Special Characteristics: Oncogenic (associated with cancer)

3. Hepatitis Viruses

  • Hepatitis A

    • Disease: Acute hepatitis

    • Mode of Transmission: Fecal-oral route

    • Special: Vaccine available

  • Hepatitis B

    • Diseases: Acute and chronic hepatitis

    • Mode of Transmission: Infected blood, sexual contact, needles

    • Special: Vaccine available

  • Hepatitis C

    • Disease: Chronic hepatitis

    • Mode of Transmission: Infected blood

    • Special: No vaccine available

4. Herpes Simplex Virus (I and II)

  • Diseases: Cold sores and sexually transmitted disease

  • Mode of Transmission: Direct contact

  • Special Characteristics: Can remain latent

5. HIV (Human Immunodeficiency Virus)

  • Disease: AIDS

  • Opportunistic Infections: Common in those infected

  • Mode of Transmission: Blood, semen, and vaginal secretions

  • Special Characteristics: Not transmitted via casual contact; involves reverse transcription

6. Human Papillomavirus (HPV)

  • Disease: Warts

  • Mode of Transmission: Contact (sexually transmitted)

  • Special Characteristics: Several serotypes, oncogenic, vaccine available

7. Influenza Virus

  • Disease: Flu

  • Mode of Transmission: Airborne (respiratory droplets)

8. Mumps Virus

  • Disease: Affects parotid glands and gonads

  • Mode of Transmission: Direct contact and droplet

  • Special Characteristics: MMR vaccine available

9. Polio Virus

  • Diseases: Fever, respiratory issues, headaches, joint and muscle pain, potential paralysis

  • Mode of Transmission: Contaminated water and direct contact with infected individuals

  • Special Characteristics: Vaccine available

10. Rabies Virus

  • Disease: Rabies

  • Mode of Transmission: Contact with an infected animal, specifically raccoons

11. Rubella Virus

  • Disease: German Measles

  • Mode of Transmission: Direct contact with secretions

  • Special Characteristics: Mild form, teratogenic during pregnancy; MMR vaccine available

12. Rubeola Virus

  • Disease: Measles (hard)

  • Mode of Transmission: Direct contact with secretions

  • Special Characteristics: Koplik spots present; chronic complications possible; MMR vaccine available

13. Variola Virus

  • Disease: Smallpox

  • Mode of Transmission: Contact with infected secretions

14. Varicella Virus

  • Disease: Chicken Pox

  • Mode of Transmission: Contact with secretions

  • Special Characteristics: Vaccine available, can remain latent

15. West Nile Virus

  • Disease: Encephalitis

  • Mode of Transmission: Via vectors, typically mosquitoes

16. Varicella Zoster Virus

  • Disease: Shingles

  • Special Characteristics: Latent virus that reactivates; vaccine available