Classes of Animal Viruses

Question 1

Classes of Viruses

Answer 1

1. dsDNA
2. ssDNA
3. dsRNA
4. ssRNA
   –> positive sense ssRNA (5’-3’) genome serves as mRNA
5. ssRNA
   –> negative sense ssRNA (3’-5’) genome template for mRNA synthesis
6. ssRNA
   –> RNA used as template for DNA synthesis

Question 2

Adenovirus

Answer 2

• Class 1 (dsDNA)
• No envelope
• Examples that cause human diseases : respiratory viruses; tumour causing viruses

Question 3

Papovavirus

Answer 3

• Class 1 (dsDNA)
• No envelope
• Examples that cause human diseases : papilloma virus (warts, cervical cancer)

Question 4

Herpesvirus

Answer 4

• Class 1 (dsDNA)
• Enveloped
• Examples that cause human diseases : herpes simplex I & II (cold sores, genital sores); varicella zoster (shingles, chicken pox); Expstein- Barr virus (mononucleosis, Burkitt’s lymphoma)

Question 5

Poxvirus

Answer 5

• Class 1 (dsDNA)
• Enveloped
• Examples that cause human diseases : smallpox virus

Question 6

Parvovirus

Answer 6

• Class 2 (ssDNA)
• No envelope

Question 7

Reovirus

Answer 7

• Class 3 (dsRNA)
• No envelope
• Examples that cause human diseases : Rotavirus (diarrhea)

Question 8

Picornavirus

Answer 8

• Class 4 (ssRNA)
• No envelope
• Examples that cause human disease : Rhinovirus (common cold); poliovirus; HAV; other enteric (intestinal) viruses

Question 9

Coronavirus

Answer 9

• Class 4 (ssRNA)
• Enveloped
• Examples that cause human disease : severe acute respiratory syndrome(SARS), SARS-CoV-2

Question 10

Flavivirus

Answer 10

• Class 4 (ssRNA)
• Enveloped
• Examples that cause human disease : Yellow fever virus; West Nile virus; HCV, Zika virus

Question 11

Togavirus

Answer 11

• Class 4 (ssRNA)
• Enveloped
• Examples that cause human disease : Rubella virus; equine encephalitis viruses

Question 12

Filovirus

Answer 12

• Class 5 (ssRNA)
• Enveloped
• Examples that cause human disease : Ebola virus (hemorrhagic fever)

Question 13

Orthomyxovirus

Answer 13

• Class 5 (ssRNA)
• Enveloped
• Examples that cause human disease : Influenza virus

Question 14

Paramyxovirus

Answer 14

• Class 5 (ssRNA)
• Enveloped
• Examples that cause human disease : Measles virus; mumps virus

Question 15

Rihabdovirus

Answer 15

• Class 5 (ssRNA)
• Enveloped
• Examples that cause human disease : Rabies virus

Question 16

Retrovirus

Answer 16

• Class 6 (ssRNA)
• Enveloped
• Examples that cause human disease : HIV/AIDS; RNA tumour viruses (leukemia)