Infection – Definition and Symptoms

Definition of Infection Infection – The invasion of the body by a pathogen (microorganism capable of causing disease), sometimes called an infectious agent, that enters cells and attempts to reproduce or replicate itself. The pathogen may be a bacterium, fungus (yeast or mold), virus, parasite, or prion. Not all infections cause symptoms or illness, and some infections may be present in […]

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Wart – Definition, Causes, Symptoms and Removal

Definition of Warts and Causes Wart is a growth, typically rough and raised, that appears on the skin. The human papillomavirus (HPV), which has numerous strains, causes common warts as well as variations including genital warts (a common sexually transmitted disease) and plantar warts which appear on the soles (plantar surfaces) of the feet. Because common warts are […]

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Influenza Virus – Symptoms, Treatment and Flu Vaccine

Influenza Definition Influenza is a common and potentially serious viral infection, commonly called the flu, that causes upper respiratory symptoms. Influenza viruses rapidly adapt and mutate, which gives them the perpetual ability to cause illness. There are three types of human influenza virus-influenza A, influenza B, and influenza C. Influenza A viruses are primarily responsible for annual outbreaks […]

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Whitlow – Herpes – Definition and Treatment

Definition of Whitlow An infection at the end of the finger, or less commonly the end of a toe, that contains pus and is very painful. The area is inflamed, enlarged, erythematous (reddened), and often oozing. A common cause of whitlow is infection with the herpes simplexvirus (HSV), conveyed to the finger via contact with infectious secretions from oral […]

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Measles Virus – Symptoms, Course and Treatment

Measles Virus Definition An illness resulting from infection with the measles virus. Once among the most common childhood diseases worldwide, measles (also called rubeola) now primarily exists in developing nations where it remains a leading cause of childhood blindness and death. Routine measles immunization, the standard of care since becoming available in the early 1960s, has […]

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Hepatitis – Types A, B, C, D – Symptoms and Treatment

Hepatitis Definition Hepatitis – inflammation of the liver. There are numerous kinds and causes. Most hepatitis results from specific viruses that cause infections of the liver, alcohol abuse, and hepatotoxic drugs. Hepatitis is the leading cause of liver failure, and reason for liver transplantation, in the United States. Types of hepatitis Infectious (viral) Hepatitis The viruses that cause viral […]

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Meningitis (Viral Infection) – Symptoms and Treatment

Meningitis Definition Inflammation of the meninges, the membranes that surround the brain and spinal cord. Meningitis may result from bacterial, viral, or fungal infection. Viruses are the most common causes of meningitis and can be highly contagious. Enteroviruses and Haemophilus influenzae type B (Hib) virus are the common viral causes, though many viruses can cause meningitis. Bacterial meningitis may be […]

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Keratitis – Symptoms, Treatment and Causes

Definition of Keratitis Keratitis is an inflammation of the cornea, usually the result of an infection. The cause of the infection is more commonly viral, such as herpes simplex or herpes zoster, than bacterial. Symptoms Include redness and irritation of the eye and conjunctiva (inner eyelids) discomfort or pain excessive tearing difficulty keeping the eye open diminished visual acuity (usually blurred […]

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Colds Symptoms and Treatment

Colds Definition Colds – common illnesses resulting from infection with one of more than 200 variations of rhinovirus, a family of highly contagious viruses that infiltrate the nasal mucosa (mucous membranes that line the inside of the nose and the sinuses). Because so many variations of rhinovirus can cause colds, most people get several colds a […]

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Mononucleosis, Infectious – Symptoms and Treatment

Infectious Mononucleosis Definition An illness that results from infection with the Epstein-barr virus. Infectious mononucleosis is most prevalent among adolescents and young adults though may occur at any age. The infection spreads through contact with saliva; among young people and within families, sharing drinks and food are common means of contracting the illness. The Epstein-Barr virus […]

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