Search results
Results From The WOW.Com Content Network
The adult body louse is about 2.5–3.5 mm long, and like a nymph it has six legs. It is wingless and is tan to grayish-white in color. Life cycle of Pediculus humanus capitis, which is similar to the body louse. The location of the body louse eggs differs from that of head louse eggs.
R. prowazekii is often surrounded by a protein microcapsular layer and slime layer; the natural life cycle of the bacterium generally involves a vertebrate and an invertebrate host, usually an arthropod, typically the human body louse. A form of R. prowazekii that exists in the feces of arthropods remains stably infective for months.
Pediculosis corporis or Vagabond's disease is a cutaneous condition caused by body lice (Pediculus humanus humanus) that lay their eggs on clothing and to a lesser extent on human hairs. [ 1 ] [ 2 ] : 447
Additionally, the DNA differences between head lice and body lice provide corroborating evidence that humans used clothing between 80,000 and 170,000 years ago, before leaving Africa. [34] Human head and body lice occupy distinct ecological zones: head lice live and feed on the scalp, while body lice live on clothing and feed on the body.
Unlike other bilateral animals, the 37 mitochondrial genes of human lice are not on a single circular chromosome but extensively fragmented. For the head louse, and the body louse, they are on 20 minichromosomes, for the pubic louse 14 minichromosomes and the chimpanzee louse,18 minichromosomes. [37]
A new study suggests human life expectancy is plateauing. In 2022, life expectancy in the US was 77.5 years, but values vary across states. Hawaii has the longest life expectancy, while ...
Pediculus humanus is divided into two subspecies, Pediculus humanus humanus, or the human body louse, sometimes nicknamed "the seam squirrel" for its habit of laying of eggs in the seams of clothing, and Pediculus humanus capitis, or the human head louse. Pthirus pubis (the human pubic louse) is the cause of the condition known as crabs.
Scientists have long debated whether human body lice might have helped drive the rapid spread of the bacteria responsible for the deadly plague in the Middle Ages, known as the Black Death.