The common cold, also known simply as a cold, is a viral infectious disease of the upper airways.
Well over 200 virus strains are implicated in causing the common cold, with rhinoviruses being the most common.
The graph below shows the proportions of people infected with four different strains of rhinovirus in 2020.
A person may develop the common cold twice within a short time.
Use information from the graph to explain why.
The information in the graph in part (a) is valuable to companies who want to develop vaccines for the common cold.
Using your knowledge of antigens, explain why.
Rhinoviruses that cause the common cold, such as the strains in part (a), may be destroyed by phagocytosis when they enter a human body.
Describe how this occurs.
Phagocytosis of a rhinovirus leads to presentation of its antigens.
State where the antigens would be presented.
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