CFHR1 and hemolytic-uremic syndrome: We could perform a genetic test in only two out of five patients with anti-FH-associated HUS, where one had a heterozygous deletion and another had a homozygous deletion in CFHR3 (upstream region, exons 1, 2, 3, 4, 6, and intron 4), and CFHR1 (introns 1, 3, and exons 2, 4, 5, 6).