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Definition Chikungunya is a mosquito-borne viral disease, very similar to dengue. The mosquitoes which spread it are Aedes aegypti and Aedes albopictus. These mosquitoes acquire the virus when they feed on an infected person. The virus spreads in the system of the mosquito and reaches its salivary glands. Soon after, …

Introduction Conjunctivitis is a nonspecific term used to describe an inflammation of the conjunctiva, which can be caused by a wide range of conditions. It is commonly referred to as “red eye” or “pink eye.” Conjunctivitis may result from primary involvement of the conjunctival tissue or may occur secondary to …

Introduction Color blindness is a genetic condition caused by a difference in how one or more of the light-sensitive cells found in the retina of the eye respond to certain colors. These cells, called cones, sense wavelengths of light, and enable the retina to distinguish between colors. This difference in …

Definition Cryptococcosis is a disease caused by fungi from the genus Cryptococcus that infect humans and animals, usually by inhalation of the fungus, which results in lung infection that may spread to the brain, causing meningoencephalitis. Cryptococcosis History In 1894 in Italy, Francesco Sanfelice was the first to isolate Cryptococcus …

Definition Cat scratch disease is an infection you can get after a cat scratches, bites, or licks you. It is caused by bacteria in cat saliva. Cats likely get the bacteria from fleas. Cat-scratch disease is also called cat-scratch fever. It is not a severe illness in healthy people. But …

Definition Cellulitis is a bacterial infection that affects the skin as well as the soft tissues under the surface of the skin. This kind of an infection usually occurs when bacteria enter normal or broken skin and start spreading under the skin into the soft tissues. This causes inflammation and …

Introduction Colon cancer is also called as colorectal cancer. Colorectal cancer is caused by the abnormal growth of epithelial cells which form the lining of the colon or rectum. These small growths (known as polyps) are often benign, although some have the potential to develop and become cancerous. It is …

Introduction Cold sore usually show up on the lips or mouth as a cluster of blisters with a red base. They are also called “fever blisters.” They may be painful and feel itchy, dry, and crusty. If the blisters come back another time, they may cause a tingling feeling before …