7 Questions
What is the size range of viruses?
20 nm to 300 nm
Why are viruses considered obligate intracellular parasites?
They lack metabolic properties and cannot replicate outside of a living cell
How are viruses observed?
Only under an electron microscope
What is the primary site of viral replication in smallpox infection?
Cytoplasm of host cell
What is the mode of transmission for smallpox virus?
Person to person contact and saliva droplets in an infected person’s breath
What is the incubation period for smallpox infection?
13-14 days
Where does the smallpox virus migrate to after entering through the upper respiratory tract?
Local lymph nodes
Study Notes
Viruses
- The size range of viruses is 20-400 nanometers (nm) in diameter.
Characteristics of Viruses
- Viruses are considered obligate intracellular parasites because they require a host cell to replicate.
Observing Viruses
- Viruses can be observed using electron microscopy.
Smallpox Infection
Replication Site
- The primary site of viral replication in smallpox infection is the lymphoid tissues.
Transmission
- The mode of transmission for smallpox virus is through respiratory droplets.
Incubation Period
- The incubation period for smallpox infection is around 10-14 days.
Virus Migration
- After entering through the upper respiratory tract, the smallpox virus migrates to the local lymph nodes, where it replicates before spreading to other parts of the body.
Test your knowledge on the general properties of viruses, including their obligate intracellular nature, host cell recognition, and size range. Learn about how viruses infect various organisms and the conditions required for their replication.
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