Ten days after Oscar caught the

virus, he felt completely well for the first time.  The figure below is a schematic

representation of the timeline of Oscar’s infection.  Answer the following questions about this

timeline.

(A)   What does the shaded blue triangle (i) represent?

(B)   

What is indicated by the dotted line (ii) and what is the significance of

when this line is crossed?

Certain timepoints/stages are represented by (iii), (iv) and

(v) on the timeline.  With reference to these timepoints/stages, explain the following:

(C)   When did Oscar start to experience symptoms of the infection? 

(D)   When will memory T cells be generated?

[1+2+1+1=5 marks]

[max. 150 words]