| Measles |
| Classification and external resources |
A child showing a classic day-4 measles rash. |
| ICD-10 |
B05 |
| ICD-9 |
055 |
| DiseasesDB |
7890 |
| MedlinePlus |
001569 |
| eMedicine |
derm/259 emerg/389 ped/1388 |
| MeSH |
D008457 |
Measles (also known as rubeola [not to be confused with rubella], morbilli, or English measles) is an infection of the respiratory system caused by a virus, specifically a paramyxovirus of the genus Morbillivirus. Morbilliviruses, like other paramyxoviruses, are enveloped, single-stranded, negative-sense RNA viruses. Symptoms include fever, cough, runny nose, red eyes and a generalized, maculopapular, erythematous rash.
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 living space with an infected person will catch it.[1] An asymptomatic incubation period occurs nine to twelve days from initial exposure.[2] The period of infectivity has not been definitively established, some saying it lasts from two to four days prior, until two to five days following the onset of the rash (i.e. four to nine days infectivity in total),[3] whereas others say it lasts from two to four days prior until the complete disappearance of the rash.[4]
There is no specific treatment for measles. Most patients with uncomplicated measles will recover with rest and supportive treatment. It is, however, important to seek medical advice if the patient becomes more unwell, as they may be developing complications. For the vast majority of healthy patients, measles is not serious; though in some cases complications may occur, which may include bronchitis, acute encephalitis and – very rarely – panencephalitis, which is usually or always fatal.[5]
|
Contents
- 1 Signs and symptoms
- 2 Cause
- 3 Diagnosis
- 4 Prevention
- 5 Treatment
- 6 Prognosis
- 7 Epidemiology
- 8 History and culture
- 8.1 History
- 8.2 Recent outbreaks
- 9 References
- 10 External links
|
Signs and symptoms[edit]
Skin of a patient after 3 days of measles infection.
Presentation of “Koplik's spots” on the third pre-eruptive day, indicative of the beginning onset of measles.
The classical signs and symptoms of measles include four-day fevers [ the 4 D's ] and the three Cs — cough, coryza (head cold), and conjunctivitis (red eyes) — along with fever, anorexia, and rashes. The fever may reach up to 40 °C (104 °F). Koplik's spots seen inside the mouth are pathognomonic (diagnostic) for measles, but are not often seen, even in real cases of measles, because they are transient and may disappear within a day of arising.
The characteristic measles rash is classically described as a generalized, maculopapular, erythematous rash that begins several days after the fever starts. It starts on the back of the ears and, after a few hours, spreads to the head and neck before spreading to cover most of the body, often causing itching. The measles rash appears two to four days after the initial symptoms and lasts for up to eight days. The rash is said to "stain", changing color from red to dark brown, before disappearing.[6]
Complications[edit]
Complications with measles are relatively common, ranging from the relatively mild and less serious ones like diarrhea to more serious ones such as pneumonia,[7] otitis media,[8] acute encephalitis (and very rarely SSPE – subacute sclerosing panencephalitis),[9] and corneal ulceration (leading to corneal scarring).[10] Complications are usually more severe in adults who catch the virus.[11] The death rate in the 1920s was around 30% for measles pneumonia.[12]
Between the years 1987 and 2000, the case fatality rate across the United States was 3 measles-attributable deaths per 1000 cases, or 0.3%.[13] In underdeveloped nations with high rates of malnutrition and poor healthcare, fatality rates have been as high as 28%.[13] In immunocompromised patients (e.g. people with AIDS) the fatality rate is approximately 30%.[14]
Cause[edit]
| Measles |
|
| Measles virus electron micrograph |
| Virus classification |
| Group: |
Group V ((-)ssRNA) |
| Order: |
Mononegavirales |
| Family: |
Paramyxoviridae |
| Subfamily: |
Paramyxovirinae |
| Genus: |
Morbillivirus |
| Species: |
Measles virus |
Measles is caused by the measles virus, a single-stranded, negative-sense, enveloped RNA virus of the genus Morbillivirus within the family Paramyxoviridae. Humans are the natural hosts of the virus; no animal reservoirs are known to exist. This highly contagious virus is spread by coughing and sneezing via close personal contact or direct contact with secretions.
Risk factors for measles virus infection include the following:
- Children with immunodeficiency due to HIV or AIDS,[15] leukemia,[16] alkylating agents, or corticosteroid therapy, regardless of immunization status[17]
- Travel to areas where measles is endemic or contact with travelers to endemic areas[17]
- Infants who lose passive antibody before the age of routine immunization[17]
Risk factors for severe measles and its complications include the following:
- Malnutrition[17][18]
- Underlying immunodeficiency[17]
- Pregnancy[17][19]
- Vitamin A deficiency[17][20]
Diagnosis[edit]
Clinical diagnosis of measles requires a history of fever of at least three days, with at least one of the three C's (cough, coryza, conjunctivitis). Observation of Koplik's spots is also diagnostic of measles.[21][22]
Alternatively, laboratory diagnosis of measles can be done with confirmation of positive measles IgM antibodies[23] or isolation of measles virus RNA from respiratory specimens.[24] In patients where phlebotomy is not possible, saliva can be collected for salivary measles-specific IgA testing.[25] Positive contact with other patients known to have measles adds strong epidemiological evidence to the diagnosis. The contact with any infected person in any way, including semen through sex, saliva, or mucus, can cause infection.[22]
Prevention[edit]
Rates of measles vaccination worldwide
Measles cases reported in the United States.
Measles cases reported in England and Wales.
In developed countries, most children are immunized against measles by the age of 18 months, generally as part of a three-part MMR vaccine (measles, mumps, and rubella). The vaccination is generally not given earlier than this because sufficient of the antimeasles immunoglobulins (antibodies) acquired via the placenta from the mother during pregnancy may persist to prevent the vaccine viruses from being effective. A second dose is usually given to children between the ages of four and five, to increase rates of immunity. Vaccination rates have been high enough to make measles relatively uncommon. Even a single case in a college dormitory or similar setting is often met with a local vaccination program, in case any of the people exposed are not already immune.[citation needed] Adverse reactions to vaccination are rare, with fever and pain at the injection site being the most common. Life threatening adverse reactions occur in less than one per million vaccinations (<0.0001%).[26]
In developing countries where measles is highly endemic, WHO doctors recommend two doses of vaccine be given at six and nine months of age. The vaccine should be given whether the child is HIV-infected or not.[27] The vaccine is less effective in HIV-infected infants than in the general population, but early treatment with antiretroviral drugs can increase its effectiveness.[28] Measles vaccination programs are often used to deliver other child health interventions, as well, such as bed nets to protect against malaria, antiparasite medicine and vitamin A supplements, and so contribute to the reduction of child deaths from other causes.[29]
Unvaccinated populations are at risk for the disease. Traditionally low vaccination rates in northern Nigeria dropped further in the early 2000s when radical preachers promoted a rumor that polio vaccines were a Western plot to sterilize Muslims and infect them with HIV. The number of cases of measles rose significantly, and hundreds of children died.[30] This could also have had to do with the aforementioned other health-promoting measures often given with the vaccine.
Claims of a connection between the MMR vaccine and autism were raised in a 1998 paper in The Lancet, a respected British medical journal.[31] Later investigation by Sunday Times journalist Brian Deer discovered the lead author of the article, Andrew Wakefield, had multiple undeclared conflicts of interest,[32] and had broken other ethical codes. The Lancet paper was later retracted, and Wakefield was found guilty by the General Medical Council of serious professional misconduct in May 2010, and was struck off the Medical Register, meaning he could no longer practise as a doctor in the UK.[33]
The GMC's panel also considered two of Wakefield's colleagues: John Walker-Smith was also found guilty and struck off the Register; Simon Murch "was in error" but acted in good faith, and was cleared.[34] Walker-Smith was later cleared and reinstated after winning an appeal; the appeal court's finding was based on the panel's conduct of the case, and gave no support to the MMR-autism hypothesis, which the official judgement described as lacking support from any respectable body of opinion.[35] The research was declared fraudulent in 2011 by the BMJ.[36] Scientific evidence provides no support for the hypothesis that MMR plays a role in causing autism.[37]
The autism-related MMR study in Britain caused use of the vaccine to plunge, and measles cases came back: 2007 saw 971 cases in England and Wales, the biggest rise in occurrence in measles cases since records began in 1995.[38] A 2005 measles outbreak in Indiana was attributed to children whose parents refused vaccination,[39] as was another outbreak in 2008 in San Diego.[40]
Treatment[edit]
There is no specific treatment for measles. Most patients with uncomplicated measles will recover with rest and supportive treatment. It is, however, important to seek medical advice if the patient becomes more unwell, as they may be developing complications.
Some patients will develop pneumonia as a sequelae to the measles. Other complications include ear infections, bronchitis, and encephalitis.[41] Acute measles encephalitis has a mortality rate of 15%. While there is no specific treatment for measles encephalitis, antibiotics are required for bacterial pneumonia, sinusitis, and bronchitis that can follow measles.
All other treatment addresses symptoms, with ibuprofen, or acetaminophen (paracetamol) to reduce fever and pain and, if required, a fast-acting bronchodilator for cough. As for aspirin, some research has suggested a correlation between children who take aspirin and the development of Reye's syndrome.[42] Some research has shown aspirin may not be the only medication associated with Reye's, and even antiemetics have been implicated,[43] with the point being the link between aspirin use in children and Reye's syndrome development is weak at best, if not actually nonexistent.[42][44] Nevertheless, most health authorities still caution against the use of aspirin for any fevers in children under 16.[45][46][47][48]
The use of vitamin A in treatment has been investigated. A systematic review of trials into its use found no significant reduction in overall mortality, but it did reduce mortality in children aged under two years.[49][50][51]
Prognosis[edit]
The vast majority of patients survive measles, though in some cases complications may occur, which may include bronchitis, and – in about 1 in 100,000 cases[52] – panencephalitis, which is usually fatal.[5] The patient may spread the disease to an immunocompromised patient, for whom the risk of death is much higher, due to complications such as giant cell pneumonia. Acute measles encephalitis is another serious risk of measles virus infection. It typically occurs two days to one week after the breakout of the measles exanthem and begins with very high fever, severe headache, convulsions and altered mentation. A patient may become comatose, and death or brain injury may occur.[53]
Epidemiology[edit]
Disability-adjusted life year for measles per 100,000 inhabitants in 2002.
no data
≤ 10
10–25
25–50
50–75
75–100
100–250
250–500
500–750
750–1000
1000–1500
1500–2000
≥ 2000
In 2011, the WHO estimated that there were about 158,000 deaths caused by measles - about 430 deaths every day. Mortality in developed countries is about 1 in 1,000 cases (.1%). In populations with high levels of malnutrition and a lack of adequate healthcare, mortality can be as high as 10%. In cases with complications, the rate may rise to 20–30%.[54] According to the 2011 United Nations Millennium Development Goals report, "the combination of increased immunization coverage and the opportunity for second-dose immunizations led to a 78% drop in measles deaths worldwide. These averted deaths represent one quarter of the decline in mortality from all causes among children under five."[55]
Even in countries where vaccination has been introduced, rates may remain high. In Ireland, vaccination was introduced in 1985. There were 99,903 cases that year. Within two years, the number of cases had fallen to 201, but this fall was not sustained. Measles is a leading cause of vaccine-preventable childhood mortality. Worldwide, the fatality rate has been significantly reduced by a vaccination campaign led by partners in the Measles Initiative: the American Red Cross, the United States Centers for Disease Control and Prevention (CDC), the United Nations Foundation, UNICEF and the WHO. Globally, measles fell 60% from an estimated 873,000 deaths in 1999 to 345,000 in 2005.[29] Estimates for 2008 indicate deaths fell further to 164,000 globally, with 77% of the remaining measles deaths in 2008 occurring within the Southeast Asian region.[56]
In 2006–07 there were 12,132 cases in 32 European countries: 85% occurred in five countries: Germany, Italy, Romania, Switzerland and the UK. 80% occurred in children and there were 7 deaths.[57]
Five out of six WHO regions have set goals to eliminate measles, and at the 63rd World Health Assembly in May 2010, delegates agreed a global target of a 95% reduction in measles mortality by 2015 from the level seen in 2000, as well as to move towards eventual eradication. However, no specific global target date for eradication has yet been agreed to as of May 2010.[58][59]
History and culture[edit]
History[edit]
The Antonine Plague, 165–180 AD, also known as the Plague of Galen, who described it, was probably smallpox or measles. The disease killed as many as one-third of the population in some areas, and decimated the Roman army.[60] Estimates of the timing of evolution of measles seem to suggest this plague was something other than measles. The first scientific description of measles and its distinction from smallpox and chickenpox is credited to the Persian physician Rhazes (860–932), who published The Book of Smallpox and Measles.[61] Given what is now known about the evolution of measles, this account is remarkably timely.
16th century Aztec drawing of someone with measles
Measles is an endemic disease, meaning it has been continually present in a community, and many people develop resistance. In populations not exposed to measles, exposure to the new disease can be devastating. In 1529, a measles outbreak in Cuba killed two-thirds of the natives who had previously survived smallpox. Two years later, measles was responsible for the deaths of half the population of Honduras, and had ravaged Mexico, Central America, and the Inca civilization.[62]
In roughly the last 150 years, measles has been estimated to have killed about 200 million people worldwide.[63] During the 1850s, measles killed a fifth of Hawaii's people.[64] In 1875, measles killed over 40,000 Fijians, approximately one-third of the population.[65] In the 19th century, the disease decimated the Andamanese population.[66] In 1954, the virus causing the disease was isolated from an 11-year old boy from the United States, David Edmonston, and adapted and propagated on chick embryo tissue culture.[67] To date, 21 strains of the measles virus have been identified.[68] While at Merck, Maurice Hilleman developed the first successful vaccine.[69] Licensed vaccines to prevent the disease became available in 1963.[70] An improved measles vaccine became available in 1968.[71]
Recent outbreaks[edit]
Main article: Measles outbreaks in the 21st century
Maurice Hilleman's measles vaccine is estimated to prevent 1 million deaths every year. [72]
In 2007, a large outbreak in Japan caused a number of universities and other institutions to close in an attempt to contain the disease.[73][74]
Approximately 1000 cases of the disease were reported in Israel between August 2007 and May 2008 (in sharp contrast to just some dozen cases the year before).[citation needed] Many children in ultra-Orthodox Jewish communities were affected due to low vaccination coverage.[75][76] As of 2008, the disease is endemic in the United Kingdom, with 1,217 cases diagnosed in 2008,[77] and epidemics have been reported in Austria, Italy and Switzerland.[78]
On February 19, 2009, 505 measles cases were reported in twelve provinces in northern Vietnam, with Hanoi accounting for 160 cases.[79] A high rate of complications, including meningitis and encephalitis, has worried health workers,[80] and the U.S. CDC recommended all travelers be immunized against measles.[81]
On 1 April 2009, the disease broke out in two schools in North Wales. Ysgol John Bright and Ysgol Ffordd Dyffryn, two schools in Wales, have had the outbreak and are making sure every pupil has had the measles vaccine.
Beginning in April 2009 there was a large outbreak of measles in Bulgaria, with over 24,000 cases including 24 deaths. From Bulgaria, the strain was carried to Germany, Turkey, Greece, Macedonia, and other European countries.[82]
Since the beginning of September, 2009, Johannesburg, a city in Gauteng, South Africa reported about 48 cases of measles. Soon after the outbreak, the government ordered all children to be vaccinated. Vaccination programs were then initiated in all schools, and parents of young children were advised to have them vaccinated.[83] Many people were not willing to have the vaccination done, as it is believed to be unsafe and ineffective. The Health Department assured the public that their program was indeed safe. Speculation arose as to whether or not new needles were being used.[84] By mid-October, there were at least 940 recorded cases, and four deaths.[85]
In early 2010, there was a serious outbreak of measles in the Philippines with 742 cases, leaving four unvaccinated children dead in the capital city of Manila.[86]
As of May 2011, over 17,000 cases of measles have so far been reported from France between January 2008 and April 2011, including 2 deaths in 2010 and 6 deaths in 2011.[87] Over 7,500 of these cases fell in the first three months of 2011, and Spain, Turkey, Macedonia, and Belgium have been among the other European countries reporting further smaller outbreaks.[88] The French outbreak has been specifically linked to a further outbreak in Quebec in 2011, where 327 cases have been reported between January and June 1, 2011,[89] and the European outbreaks in general have also been implicated in further small outbreaks in the USA, where 40 separate importations from the European region had been reported between January 1 and May 20.[90]
Some experts stated that the stubborn persistence of the disease in Europe could be a stumbling block to global eradication. It has proven difficult to vaccinate a sufficient number of children in Europe to eradicate the disease, because of opposition on philosophical or religious grounds, or fears of side-effects, or because some minority groups are hard to reach, or simply because parents forget to have their children vaccinated. Vaccination is not mandatory in Europe, in contrast to the United States and many Latin American countries, where children must be vaccinated before they enter school.[82]
As of July 2011, 1,145 children have died of 115,600 cases in the DRC, which is also battling deadly outbreaks of cholera and polio.[91]
In August 2011, an outbreak in New Zealand has seen 94 confirmed cases in Auckland alone.[92]
In November 2011, an outbreak was reported in Canberra, the capital city of Australia, with at least 12 reported cases.[93]
In February 2012, an outbreak was registered in St. Petersburg with 87 cases.[94]
In February 2012, an outbreak was declared in Liverpool, UK with 48 cases.[95]
In March 2013, an epidemic was declared in Swansea, Wales, UK with 1,011 cases and 84 hospitalizations to date.[96] A 25-year-old male is the first suspected death. He had measles at the time of death but it is not yet known if it was the cause of death; post-mortem examination of the body has been inconclusive in showing a cause of death.[97] There have been growing concerns that the epidemic could spread to London and infect many more people due to poor MMR uptake,[98] prompting the Department of Health to setup a mass vaccination campaign targeted at one million school children throughout England.[99]
The Americas[edit]
Indigenous measles was declared to have been eliminated in North, Central, and South America; the last endemic case in the region was reported on November 12, 2002, with only northern Argentina and rural Canada, particularly in Ontario, Quebec, and Alberta, having minor endemic status.[100] Outbreaks are still occurring, however, following importations of measles viruses from other world regions. In June 2006, an outbreak in Boston resulted after a resident became infected in India.[101]
Between January 1 and April 25, 2008, a total of 64 confirmed measles cases were preliminarily reported in the United States to the CDC,[102][103] the most reported by this date for any year since 2001. Of the 64 cases, 54 were associated with importation of measles from other countries into the United States, and 63 of the 64 patients were unvaccinated or had unknown or undocumented vaccination status.[104] By July 9, 2008, a total of 127 cases were reported in 15 states (including 22 in Arizona),[105] making it the largest U.S. outbreak since 1997 (when 138 cases were reported).[106] Most of the cases were acquired outside of the United States and afflicted individuals who had not been vaccinated. By July 30, 2008, the number of cases had grown to 131. Of these, about half involved children whose parents rejected vaccination. The 131 cases occurred in seven different outbreaks. There were no deaths, and 15 hospitalizations. Eleven of the cases had received at least one dose of measles vaccine. Children who were unvaccinated or whose vaccination status was unknown accounted for 122 cases. Some of these were under the age when vaccination is recommended, but in 63 cases, the vaccinations had been refused for religious or philosophical reasons.
On May 24, 2011, the CDC reported that the United States has had 118 measles cases so far that year. The 118 cases were reported by 23 states and New York City between Jan 1 and May 20. Of the 118 cases, 105 (89%) were associated with cases abroad and 105 (89%) of the 118 patients had not been vaccinated.[107]
On September 29, 2011, Ecuador's Ministry of Health reported an outbreak with 42 cases of measles recorded inside a few adjacent communities of the central Andean province of Tungurahua. No fatalities had been reported as of that date. According to the Ecuadorean government, the viral strain responsible seemed to be linked to African outbreaks; the government also announced that it was launching a massive vaccination campaign to prevent further spread of the disease.
On February 8, 2012, it was reported that hundreds of thousands of people at the Super Bowl Village in Indianapolis could have been exposed to measles when the Indiana State Department of Health confirmed that an infected person went to Super Bowl Village in downtown Indianapolis on Feb. 3.[108]
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- ^ Shror, Karsten (2007). "Aspirin and Reye Syndrome: A Review of the Evidence". Journal of Pediatric Drugs 9 (3): 195–204. doi:10.2165/00148581-200709030-00008. PMID 17523700. Retrieved 2011-03-17. "The suggestion of a defined cause-effect relationship between aspirin intake and Reye syndrome in children is not supported by sufficient facts. Clearly, no drug treatment is without side effects. Thus, a balanced view of whether treatment with a certain drug is justified in terms of the benefit/risk ratio is always necessary. Aspirin is no exception."
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- ^ Reye's Syndrome at NINDS "Epidemiologic evidence indicates that aspirin (salicylate) is the major preventable risk factor for Reye's syndrome. The mechanism by which aspirin and other salicylates trigger Reye's syndrome is not completely understood."
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- ^ [2] “Sub acute sclerosing panencephalitis”
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External links[edit]
- WHO.int — 'Initiative for Vaccine Research (IVR): Measles', World Health Organization (WHO)
- Measles FAQ from Centers for Disease Control and Prevention in the United States
- Case of an adult male with measles (facial photo)
- Clinical pictures of measles
- Virus Pathogen Database and Analysis Resource (ViPR): Paramyxoviridae
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Infectious skin disease: Viral cutaneous conditions, including viral exanthema (B00–B09, 050–059)
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DNA virus
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Herpesviridae
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Alpha
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HSV (Herpes simplex, Herpetic whitlow, Herpes gladiatorum, Herpetic keratoconjunctivitis, Herpetic sycosis, Neonatal herpes simplex, Herpes genitalis, Herpes labialis, Eczema herpeticum, Herpetiform esophagitis) · Herpes B virus (B virus infection)
VZV (Chickenpox, Herpes zoster, Herpes zoster oticus, Ophthalmic zoster, Disseminated herpes zoster, Zoster-associated pain, Inflammatory skin lesions following zoster infection, Modified varicella-like syndrome)
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Beta
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Human herpesvirus 6/Roseolovirus (Exanthema subitum, Roseola vaccinia)
Cytomegalic inclusion disease
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Gamma
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KSHV (Kaposi's sarcoma)
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Poxviridae
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Ortho
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Variola (Smallpox, Alastrim) · MoxV (Monkeypox) · CV (Cowpox) · VV (Vaccinia, Generalized vaccinia, Eczema vaccinatum, Progressive vaccinia)
Buffalopox
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Para
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Farmyard pox: Milker's nodule · Bovine papular stomatitis · Pseudocowpox · Orf
Sealpox
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Other
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Yatapoxvirus: Tanapox · Yaba monkey tumor virus
MCV (Molluscum contagiosum)
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Papillomaviridae
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HPV (Wart/Plantar wart, Heck's disease, Genital wart (giant), Laryngeal papillomatosis, Butcher's wart, Bowenoid papulosis, Epidermodysplasia verruciformis, Verruca plana, Pigmented wart, Verrucae palmares et plantares )
BPV (Equine sarcoid)
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Parvoviridae
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Parvovirus B19 (Erythema infectiosum, Reticulocytopenia, Papular purpuric gloves and socks syndrome)
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Polyomaviridae
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Merkel Cell Polyomavirus (Merkel Cell carcinoma)
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RNA virus
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Paramyxoviridae
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MeV (Measles)
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Togaviridae
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Rubella virus (Rubella, Congenital rubella syndrome) · Alphavirus infection · Chikungunya fever
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Picornaviridae
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CAV (Hand, foot and mouth disease, Herpangina) · FMDV (Foot-and-mouth disease) · Boston exanthem disease
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| Ungrouped |
unknown/multiple: Asymmetric periflexural exanthem of childhood · Post-vaccination follicular eruption · Lipschütz ulcer · Eruptive pseudoangiomatosis · Viral-associated trichodysplasia · Gianotti–Crosti syndrome
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cutn/syst (hppv/hiva, infl/zost/zoon)/epon
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drug (dnaa, rnaa, rtva, vacc)
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noco (i/b/d/q/u/r/p/m/k/v/f)/cong/tumr (n/e/d), sysi/epon
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proc, drug (D2/3/4/5/8/11)
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Diseases of poverty
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| Diseases of poverty |
- AIDS
- Malaria
- Tuberculosis
- Measles
- Pneumonia
- Diarrheal diseases
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| Neglected diseases |
- Cholera
- Chagas disease
- African Sleeping Sickness
- Schistosomiasis
- Guinea worm
- River blindness
- Leishmaniasis
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| Miscellaneous |
- Malnutrition
- Priority review voucher
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