The head lice specimens were removed from the 70% ethanol by being washed three times with phosphate buffer saline (1XPBS), and then an individual head louse of each sample was homogenized in 200 μl of lysis buffer G and 20 μl of proteinase K. The genomic DNA was extracted
using a DNA extraction kit, Invisorb® spin tissue mini kit (STRATEC molecular GmbH, Berlin, Germany) following the manufacturer’s instructions. The extracted head lice DNA was eluted in 40 μl of elution buffer, and the concentration was measured using Nano drop 2000c (Thermo-scientific, USA). The genomic DNA was stored for an extended time at −20°C until the next stage of the investigation.