With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Scabies is an infection of the skin that is contagious.
text_B: Scabies , previously known as the seven-year itch , is a contagious skin infestation by the mite Sarcoptes scabiei .. Sarcoptes scabiei. Sarcoptes scabiei. mite. mite. infestation. infestation. The most common symptoms are severe itchiness and a pimple-like rash .. itchiness. itchiness. pimple. papular. Occasionally tiny burrows may be seen in the skin .. When first infected , usually two to six weeks are required before symptoms occur .. If a person develops a second infection later in life , symptoms may begin within a day .. These symptoms can be present across most of the body or just certain areas such as the wrists , between fingers , or along the waistline .. The head may be affected , but this is typically only in young children .. The itch is often worse at night .. Scratching may cause skin breakdown and an additional bacterial infection of the skin .. Scabies is caused by infection with the female mite Sarcoptes scabiei var .. Sarcoptes scabiei. Sarcoptes scabiei. mite. mite. hominis .. The mites burrow into the skin to live and deposit eggs .. The symptoms of scabies are due to an allergic reaction to the mites .. allergic reaction. allergic reaction. Often only between ten and fifteen mites are involved in an infection .. Scabies is most often spread during a relatively long period of direct skin contact with an infected person -LRB- at least 10 minutes -RRB- such as that which may occur during sex .. Spread of disease may occur even if the person has not developed symptoms yet .. Crowded living conditions such as those found in child care facilities , group homes , and prisons increase the risk of spread .. Areas with a lack of access to water also have higher rates of disease .. Crusted scabies is a more severe form of the disease .. It typically only occurs in those with a poor immune system and people may have millions of mites , making them much more contagious .. poor immune system. immunosuppression. In these cases spread of infection may occur during brief contact or via contaminated objects .. The mite is very small and usually not directly visible .. mite. mite. Diagnosis is based on the signs and symptoms .. A number of medications are available to treat those infected , including permethrin , crotamiton and lindane creams and ivermectin pills .. crotamiton. crotamiton. lindane. lindane. ivermectin. ivermectin. permethrin. permethrin. Sexual contacts within the last month and people who live in the same house should also be treated at the same time .. Bedding and clothing used in the last three days should be washed in hot water and dried in a hot dryer .. As the mite does not live for more than three days away from human skin more washing is not needed .. mite. mite. Symptoms may continue for two to four weeks following treatment .. If after this time there continue to be symptoms retreatment may be needed .. Scabies is one of the three most common skin disorders in children , along with ringworm and bacterial skin infections .. ringworm. tinea. bacterial skin infections. pyoderma. As of 2015 it affects approximately 204 million people -LRB- 2.8 % of the world population -RRB- .. It is equally common in both sexes .. The young and the old are more commonly affected .. It also occurs more commonly in the developing world and tropical climates .. developing world. developing world. The word scabies is from scabere , `` to scratch '' .. Other animals do not spread human scabies .. Infection in other animals is typically caused by slightly different but related mites and is known as sarcoptic mange .. sarcoptic mange. sarcoptic mange
related.