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Health Illustrated Encyclopedia Multimedia H1N1 (swine) influenza 09/16/2011
Swine flu Causes, incidence, and risk factors: Earlier forms of the H1N1 virus were found in pigs. Over time, the virus changed (mutated) and infected humans. H1N1 was a new virus in humans in 2009, and it spread quickly around the world.
Health Illustrated Encyclopedia Multimedia Hairy cell leukemia 06/05/2012
Leukemic reticuloendotheliosis; HCL; Leukemia - hairy cell Causes, incidence, and risk factors: HCL is caused by the abnormal growth of B cells. The cells look "hairy" under the microscope because they have fine projections coming from their surface. HCL usually leads to low numbers of normal blood cells. The cause of this disease is unknown.
Health Illustrated Encyclopedia Multimedia Hallervorden-Spatz disease 08/28/2012
Pantothenate kinase-associated neurodegeneration Causes, incidence, and risk factors: Hallervorden-Spatz disease usually begins in childhood. Most cases of Hallervorden-Spatz disease are due to a defect in a gene that makes a protein called pantothenate kinase 2. Patients with this genetic defect have a buildup of iron in parts of the brain.
Health Illustrated Encyclopedia Multimedia Hammer toe 08/11/2012
Hammer toe is a deformity of the toe, in which the end of the toe is bent downward. Causes, incidence, and risk factors: Hammer toe usually affects the second toe. However, it may also affect the other toes. The toe moves into a claw-like position. The most common cause of hammer toe is wearing short, narrow shoes that are too tight. The toe is forced into a bent position. Muscles and tendons in the toe tighten and become shorter. Hammer toe is more likely to occur in: Women who wear shoes that do not fit well or have high heels Children who keep wearing shoes they have outgrown The condition may be present at birth (congenital) or develop over time.
Health Illustrated Encyclopedia Multimedia Hand-foot-mouth disease 08/10/2012
Coxsackievirus infection Causes, incidence, and risk factors: Hand-foot-and-mouth disease (HFMD) is most commonly caused by coxsackievirus A16, a member of the enterovirus family. The disease is not spread from pets, but it can be spread by person to person. You may catch it if you come into direct contact with nose and throat discharges, saliva, fluid from blisters, or the stools of an infected person.
Health Illustrated Encyclopedia Multimedia Hantavirus 03/11/2011
Hantavirus pulmonary syndrome; Hemorrhagic fever with renal syndrome Causes, incidence, and risk factors: Hantavirus is carried by rodents, especially deer mice. The virus is found in their urine and feces, but it does not make the animal sick. It is believed that humans can get sick with this virus if they come in contact with contaminated dust from mice nests or droppings.
Health Illustrated Encyclopedia Multimedia Hardening of the arteries 06/03/2012
Atherosclerosis; Arteriosclerosis; Plaque buildup - arteries Causes, incidence, and risk factors: Hardening of the arteries is a process that often occurs with aging.
Health Illustrated Encyclopedia Multimedia Hartnup disorder 07/08/2012
Hartnup disorder is an inherited metabolic condition that involves the transport of certain amino acids (for example, tryptophan and histidine) in the small intestine and kidneys. Causes, incidence, and risk factors: Hartnup disorder is possibly the most common metabolic condition involving amino acids. It is an inherited condition. A child must inherit a copy of the defective gene from both parents in order to be seriously affected. The condition usually starts between ages 3 - 5 years.
Health Illustrated Encyclopedia Multimedia Head lice 02/21/2013
Pediculosis capitis - head lice Causes, incidence, and risk factors: Head lice infect hair on the head. Tiny eggs on the hair look like flakes of dandruff . However, instead of flaking off the scalp, they stay put. Head lice can live up to 30 days on a human.
Health Illustrated Encyclopedia Multimedia Hearing loss - infants 02/01/2012
Deafness - infants; Hearing impairment - infants; Conductive hearing loss - infants; Sensorineural hearing loss - infants; Central hearing loss - infants Causes, incidence, and risk factors: Although it is not common, some infants may have some hearing loss at birth. Hearing loss can also develop in children who had normal hearing as infants.
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