Viral viruses

2. virus– Major cause of bronchiolitis in babies.
3. – Weakens the immune system, leading to AIDS if untreated.
5. – Attacks the liver and can cause chronic infection.
8. – Can paralyze muscles, historically causing polio epidemics.
12. – Causes cold sores or genital herpes.
15. – Highly contagious, causing sudden vomiting and diarrhea.
16. virus – Causes the seasonal flu with fever, cough, and body aches.
17. – Deadly if untreated, transmitted by animal bites.
19. – The virus responsible for COVID-19, causing respiratory illness worldwide.
20. – Swells the salivary glands and sometimes testes.

1. Often silent but can affect newborns or immunocompromised people.
4. zoster – Causes chickenpox and can reactivate as shingles later.
6. Barr – Causes infectious mononucleosis (“kissing disease”).
7. – Causes “German measles,” dangerous in pregnancy.
9. – Spread by mosquitoes, causing fever, rash, and joint pain.
10. Can cause warts and cervical or other cancers.
11. – The main culprit behind the common cold.
13. – Causes severe diarrhea in infants and young children.
14. – Leads to a highly contagious rash and fever.
18. – A liver virus often spread through blood, leading to chronic liver disease.