Epor reveals a sharp decline in its relative expression level from about 75 on day 0 p.i. to about 25 on day 1 p.i.., before it continuously increases almost linearly reaching its maximal level of about 120 towards the end of crisis on day 11 p.i. By contrast, Epo expression is impaired during the first 4 days of infection, then it sharply increases reaching its maximum expression of approximately 8 at peak parasitaemia on day 8 p.i., before declining to a level of about 3 towards the end of the crisis phase on day 11 p.i. The gene discussed is EPO; the disease is infection.