As shown in Table 2, 2/18 of the samples containing immune-complexed HRP2 were PCR-negative and did not have detectable free HRP2 (i.e. all HRP2 was in complexed form); 5/18 samples with immune complexes were PCR-negative and had detectable free HRP2 (likely recently resolved infections); and 11/18 were PCR-positive and had detectable free HRP2. This evidence concerns the gene HDGFL2 and infection.