CD55 and infection: A blind qualitative observation elucidated that in both WT and Daf-/- mice, infection foci were mainly restricted to alveoli (Fig 3B), and quantification of infected bronchioli per lung section did not display relevant dissimilarities (27.8±12.7 in WT and 28.4±9.8 in Daf-/-) (Fig 3C).