Further testing showed genotype 1b CHC infection, interleukin (IL) 28B C/T and inosine triphosphatase (ITPA) CC/AA genotypes, and a low viral load (HCV RNA 53049 IU/mL; HCV Abbott RealTime PCR version 4.0, lower limit of quantification 12 IU/mL; Abbott GmbH & Co., Wiesbaden, Germany). Here, ITPA is linked to cryohydrocytosis.