Measles
| Measles | |
|---|---|
| Specialty | Infectious diseases  |
Template:Taxobox begin Template:Taxobox begin placement virus Template:Taxobox group v entry Template:Taxobox ordo entry Template:Taxobox familia entry Template:Taxobox genus entry Template:Taxobox species entry Template:Taxobox end placement Template:Taxobox end Measles, also known as rubeola, is a common disease caused by a virus of the genus Morbillivirus.
Reports of measles go back to at least 700, however, the first scientific description of the disease and its distinction from smallpox is attributed to the Muslim physician Ibn Razi (Rhazes) 860-932 who published a book entitled "Smallpox and Measles" (in Arabic: Kitab fi al-jadari wa-al-hasbah). In 1954, the virus causing the disease was isolated, and licensed vaccines to prevent the disease became available in 1963.
Measles is spread through respiration (contact with fluids from an infected person's nose and mouth, either directly or through aerosol transmission), and is highly contagious - 90% of people without immunity sharing a house with an infected person will catch it. Airborne precautions should be taken for all suspected cases of measles.
The incubation period usually lasts for 10-12 days (during which there are no symptoms).
Infected people remain contagious from the appearance of the first symptoms until 3-5 days after the rash appears.
Symptoms
chalkboard
Diagnosis
BUTT
Treatment
There is no specific treatment for uncomplicated measles. Patients with uncomplicated measles will recover with rest and supportive treatment.
Complications
Complications with measles are relatively common, ranging from relatively common and less serious diarrhea, to pneumonia and encephalitis. Complications are usually more severe amongst infants and adults who catch the virus.
The fatality rate from measles for otherwise healthy people in developed countries is low: approximately 1 death per thousand cases. In underdeveloped nations with high rates of malnutrition and poor healthcare, fatality rates of 10 percent are common. In immunocompromised patients, the fatality rate is approximately 30 percent.
Public health
In developed countries, most children are immunised against measles at the age of 18 months as part of a three-part MMR vaccine (measles, mumps, and rubella). The vaccination is generally not given earlier than this because children younger than 18 months usually retain anti-measles immunoglobulins transmitted from the mother during pregnancy. A booster shot is then given between the ages of four and five. Vaccination rates have been high enough to make measles relatively uncommon. Even a single case in a college dorm or similar setting is often met with a local vaccination program, in case any of the people exposed are not already immune. In developing countries, measles remains common.
The recent vaccine controversy in the UK regarding a potential link between the combined MMR vacine (vaccinating children from mumps, measles and rubella) and autism has prompted a resurgence in popularity of the "measles party", where parents deliberately infect the child with measles in order to build up the child's immunity without requiring an injection. This practice poses many health risks to the child, and has been discouraged by the UK's National Health Service.
Measles is a significant infectious disease because, while the rate of complications is not high, the disease itself is so infectious that the sheer number of people who would suffer complications in an outbreak amongst non-immune people would quickly overwhelm available hospital resources. If vaccination rates fall, the number of non-immune persons in the community rises and the risk of an outbreak of measles consequently rises.
According to the World Health Organization, measles is the leading cause of vaccine preventable childhood mortality - there are 30 million cases and 875,000 deaths caused by measles every year [1].
See also
External links
- WHO.int - 'Initiative for Vaccine Research (IVR): Measles', World Health Organization (WHO)