Mean circulating CL-K1 serum levels among Nigerian individuals without schistosomiasis were 246±155 ng/mL, largely similar to levels observed in Japanese (340±130 ng/mL), Danish (284±∼180 ng/mL) and American populations (265±177 ng/mL) [25, 26, 35]. The gene discussed is CLK1; the disease is schistosomiasis.