APOA2 and protozoa infectious disease: ,58 Nevertheless, some small-magnitude associations with early-life exposures were observed here even for apolipoproteins measured in childhood, although only for ApoA-I (directly with transferrin, inversely with protozoal infections), ApoA-II (directly with MPO and mannitol, inversely with proline), and ApoB (directly with transferrin) were these statistically significant in the final models.