MASP1 and infection: After day 4 p.i., Mbl1 expression declined in both vaccinated and unvaccinated mice, but only until the peak of parasitaemia on day 8 p.i., when the decline stopped and turned into an increased expression towards the end of the crisis on day 11 p.i. Unlike Mbl1, however, the expression of Masp1 followed a different time course after infection, particularly in vaccinated mice, resembling more that of C1qa, C1qb, and C1qc (Figure 5B).