Podcast
Questions and Answers
What controls which cell type a virus can infect?
What controls which cell type a virus can infect?
- The location of the virus in the environment
- The presence of the appropriate receptor on the cell surface (correct)
- The size of the virus
- The age of the host organism
How do viruses enter the body?
How do viruses enter the body?
- By inhalation, ingestion, sexual intercourse, or inoculation through the skin or mucous membranes (correct)
- By contact with infected individuals
- By exposure to contaminated water or food
- By genetic inheritance
How does a disseminated infection occur?
How does a disseminated infection occur?
- The virus causes localized infections with short incubation periods
- The virus replicates initially at the site of entry and then spreads throughout the body (correct)
- The virus remains confined to the site of entry
- The virus enters nerve endings and travels to infect the central nervous system
What does the term 'incubation period' define?
What does the term 'incubation period' define?
How do viruses cause infection in the central nervous system?
How do viruses cause infection in the central nervous system?
How do viruses gain entry into the body?
How do viruses gain entry into the body?
What is the major factor that controls which cell type a virus can infect?
What is the major factor that controls which cell type a virus can infect?
How does a disseminated infection occur?
How does a disseminated infection occur?
Which route of transmission may lead to vertical transmission of infection from a mother to her foetus?
Which route of transmission may lead to vertical transmission of infection from a mother to her foetus?
What defines the time from exposure to an organism to the onset of clinical disease?
What defines the time from exposure to an organism to the onset of clinical disease?
Study Notes
Virus Infection and Transmission
- The major factor that controls which cell type a virus can infect is the presence of specific receptors on the surface of the host cell.
- Viruses enter the body through various routes, including respiratory, gastrointestinal, and skin/mucous membrane portals.
- A disseminated infection occurs when a virus spreads through the bloodstream or lymphatic system, allowing it to infect multiple cells and organs.
- The incubation period defines the time from exposure to an organism to the onset of clinical disease, during which the virus multiplies and causes infection.
- Viruses can cause infection in the central nervous system by crossing the blood-brain barrier or through direct neural transmission.
- Viruses gain entry into the body through various means, including respiratory droplets, contaminated food and water, and vector transmission (e.g., mosquito bites).
- The vertical transmission of infection from a mother to her fetus can occur through the placenta, particularly during pregnancy, if the mother is infected with a virus.
- The incubation period is the time between exposure to a virus and the onset of symptoms, during which the virus replicates and causes disease.
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Description
Explore the mechanisms of virus infection and cell tropism, including the factors influencing which cell types a virus can infect and the methods through which viruses enter the body. Learn about the role of receptors in virus entry and the various modes of viral transmission.
