Head lice / louse
The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans that causes head lice infestation (pediculosis capitis).[1]
Head lice are wingless insects spending their entire lives on the human scalp and feeding exclusively on human blood.[1] Humans are the only known hosts of this specific parasite, while chimpanzees host a closely related species, Pediculus schaeffi. Other species of lice infest most orders of mammals and all orders of birds,[1] as well as other parts of the human body.
Lice differ from other hematophagic ectoparasites such as fleas in spending their entire lifecycle on a host.[2] Head lice cannot fly, and their short, stumpy legs render them incapable of jumping, or even walking efficiently on flat surfaces.[2]
The non-disease-carrying head louse differs from the related disease-carrying body louse (Pediculus humanus humanus) in preferring to attach eggs to scalp hair rather than to clothing. The two subspecies are morphologically almost identical, but do not normally interbreed, although they will do so in laboratory conditions. From genetic studies, they are thought to have diverged as subspecies about 30,000–110,000 years ago, when many humans began to wear a significant amount of clothing.[3][4] A much more distantly related species of hair-clinging louse, the pubic or crab louse (Pthirus pubis), also infests humans. It is visually different from the other two species and is much closer in appearance to the lice which infest other primates.[5] Lice infestation of any part of the body is known as pediculosis.[6]
Head lice (especially in children) have been, and still are, subject to various eradication campaigns. Unlike body lice, head lice are not the vectors of any known diseases. Except for rare secondary infections that result from scratching at bites, head lice are harmless, and they have been regarded by some as essentially a cosmetic rather than a medical problem. Head lice infestations might be beneficial in helping to foster a natural immune response against lice which helps humans in defense against the far more dangerous body louse, which is capable of transmission of dangerous diseases.[7]
Johnstown
Johnstown is a city and the county seat of Fulton County in the U.S. state of New York. As of the 2010 Census, the city had population of 8,743.[1] The city was named after its founder, Sir William Johnson.[2]
The city of Johnstown is mostly surrounded by the town of Johnstown, of which it was once a part when it was a village. Also adjacent to the city is the city of Gloversville. The two cities are together known as the “Glove Cities”. They are known for their history of specialty manufacturing. Johnstown is located approximately 45 miles (72 km) west of Albany, about one-third of the way between Albany and the Finger Lakes region to the west.
Johnstown, originally “John’s Town”, was founded in 1762 by Sir William Johnson, a Baronet who named it after his son John Johnson.[3] William Johnson came to the British colony of New York from Ireland in 1732.[4] He was a trader who learned American Indian languages and culture, forming close relationships with many Native American leaders. He was appointed as the Superintendent of Indian Affairs, as well as a major general in the British forces during the French and Indian War (Seven Years’ War). His alliances with the Iroquois were significant to the war.
As a reward for his services, Johnson received large tracts of land in what are now Hamilton and Fulton counties. He established Johnstown and became one of New York’s most prosperous and influential citizens. He was the largest landowner in the Mohawk Valley, with an estate of more than 400,000 acres (1,600 km2) before his death. Having begun as an Indian trader, he expanded his business interests to include a sawmill and lumber business, and a flour mill that served the area. Johnson, the largest slaveholder in the county and perhaps in the state of New York, had some 60 enslaved Africans working these businesses. He also recruited many Scots-Irish tenant farmers to work his lands.[5] Observing Johnson’s successful business endeavors, the local Native American inhabitants dubbed him Warragghivagey, or “he who does much business.”[6]