Immune Response
Immune Response: Overview
This topic covers concepts, such as Immune Response, Primary Immune Response, and Secondary Immune Response.
Important Questions on Immune Response
In order to understand immune responses to COVID-19 viral infection, a researcher took five individuals of an animal model of the disease. One of these animals was infected, in controlled lab conditions, by nasal spray of the viral suspension. The animal developed pneumonia-like symptoms (fever and difficulty in breathing) ten days later. Blood plasma was collected at two time points from the infected animal:
i. when symptoms were still there (draw 1), ii. seven days after the animal completely recovered from the illness (draw 2). The remaining four animals were given different treatments with the plasma (either draw 1 or draw 2), and then challenged with viral infection. Symptom development was monitored and results are tabulated. (assume the plasma is made hypoallergenic by chemical treatment)
| Treatment (M,N,O or P) | Result |
| (M). Injection of draw 1, followed by mock spray (no virus) | only fever developed |
| (N). Injection of draw 1, followed by the viral challenge | mild disease symptoms |
| (O). Injection of draw 2, followed by the viral challenge | no disease symptoms |
| (P). No plasma treatment before the viral challenge | severe disease symptoms |
Based on these results, the correct inference(s) would be.
SARS-CoV- is a novel corona virus that causes COVID The disease, in most cases, starts with mild symptoms such as fever and cough that may aggravate to pneumonia and severe acute respiratory distress (breathing difficulty). In majority of the infected, the disease is limited to only mild symptoms and the virus is cleared (negative in viral diagnostic test) in days after symptoms appear. In such cases, the most likely immune mechanism(s) responsible for clearance of the viral infection is(are)
All the following are related to innate immunity except:
Which of the following is an incorrect statement about the second response of the body against a previously infected antigen?
The characteristic feature of anamnestic response is
Which of the following is correct for immuno-modulators?
Obstacle to large scale transplantation of organs is
