This is a ‘Video of ordinary head lice – but, at 200X magnification. ‘
Head lice came with us out of Africa
Thursday, 7 February 2008 Maggie Fox
Genetic tests show the lice are nearly identical to strains found around the world that have been dated to when humans first began to colonise the rest of the world.
“It tells us that this genetic type got around the globe right as humans spread and migrated around the globe,” says Dr David Reed of the University of Florida, who worked on the study.
“We know that this parasite was distributed all over the globe along with us.”
Writing online in the Journal of Infectious Diseases, the researchers note there are three known strains, or clades, of head lice: A, B and C.
Clade A is found everywhere, clade B is common in both North America and Europe and clade C is rare.