Chewing tobacco: Tobacco that is chewed, not smoked. A form of smokeless tobacco.
Chewing tobacco and snuff are the two main forms of smokeless tobacco in use in the United States. The prototypes of the person chewing tobacco were the baseball player (or coach) and the cowboy with a chew of tobacco in his cheek.
Cancers of the oral cavity (i.e., the mouth, lip, and tongue) have been associated with the use of chewing tobacco as well as snuff. Studies indicate that the tumors often arise at the site of placement of the tobacco.
Smokeless tobacco was formally classified as a “known human carcinogen” by the US government in 2000.
- Chicken genome
Chicken genome: The genome of the Red Jungle Fowl, Gallus gallus, the ancestor of domestic chickens, comprising about 1 billion DNA base pairs. The Gallus gallus genome was the first avian genome to be sequenced. A team led by Richard Wilson from the Washington University School of Medicine in St. Louis assembled this genome in […]
A highly infectious viral disease also known medically as varicella — in many countries, this disease is always called “varicella” — that causes a blister-like rash, itching, fatigue and fever. The rash crops up first on the face and trunk and can spread over the entire body resulting in 250 to 500 itchy blisters. Chickenpox […]
- Chickenpox immunization
Chickenpox immunization: Immunization designed to prevent or lessen the severity of the common disease known as chickenpox. The vaccination currently involves two shots, the first dose (shot) at age 12 through 15 months and the second dose (shot) at age 4 through 6 years. The second dose may be given at an earlier age if […]
- Chickenpox rash
Chickenpox rash: Chickenpox is characterized by a rash, often the first sign of the disease. The rash of chickenpox develops in crops with raised red spots arriving first, progressing to blisters that burst, creating open sores, before crusting over. This process usually starts on the scalp, then the trunk (its area of greatest concentration), and […]
The larvae of one type of mites, of the family Trombiculidae. The larvae, or juvenile forms, feed on vertebrates such as humans, while the adult mites feed on soil. Chigger bites produce a red welt accompanied by an intense and unrelenting itch. Chiggers are so tiny that they can barely be seen with the naked […]