Metagenome of healthy blood human donors
1 mL of plasma was filtered through 0.45 micrometre filter and was used to extract nucleic acids with the QIAAMP Ultra Sens Virus Kit (Qiagen). DNA was amplified from the final elution with the TruePrime WGA kit (Sygnis). Amplification products were used for library preparation using Nextera XT DNA library preparation kit (Illumina).