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The MMR vaccine is a vaccine against measles, mumps, and rubella (German measles), abbreviated as MMR.<ref name=Mau2005/> The first dose is generally given to children around 9 months to 15 months of age, with a second dose at 15 months to 6 years of age, with at least four weeks between the doses.<ref name="CDC2021">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=WHO2017Pos>Template:Cite journal</ref><ref>Template:Cite journal</ref> After two doses, 97% of people are protected against measles, 88% against mumps, and at least 97% against rubella.<ref name="CDC2021"/> The vaccine is also recommended for those who do not have evidence of immunity,<ref name="CDC2021"/> those with well-controlled HIV/AIDS,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=ACIP1998>Template:Cite journal</ref> and within 72 hours of exposure to measles among those who are incompletely immunized.<ref name=WHO2017Pos/> It is given by injection.<ref name="CDCAdmin">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
The MMR vaccine is widely used around the world. As of 2012, 575 million doses had been administered since the vaccine's introduction worldwide.<ref name=EU2018>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Measles resulted in 2.6 million deaths per year before immunization became common.<ref name=EU2018/> This has decreased to 122,000 deaths per year Template:As of mostly in low-income countries.<ref name=EU2018/> Through vaccination, Template:As of, rates of measles in North and South America are very low.<ref name=EU2018/> Rates of disease have been seen to increase in populations that go unvaccinated.<ref name=EU2018/> Between 2000 and 2018, vaccination decreased measles deaths by 73%.<ref name="WHO Measles Fact Sheet">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Side effects of immunization are generally mild and resolve without any specific treatment.<ref name="CDC2021Vis">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> These may include fever, as well as pain or redness at the injection site.<ref name="CDC2021Vis"/> Severe allergic reactions occur in about one in a million people.<ref name="CDC2021Vis"/> Because it contains live viruses, the MMR vaccine is not recommended during pregnancy but may be given during breastfeeding.<ref name="CDC2021"/> The vaccine is safe to give at the same time as other vaccines.<ref name="CDC2021Vis"/> Being recently immunized does not increase the risk of passing measles, mumps, or rubella on to others: That is, even though the vaccine contains live viruses, they are not transmitted.<ref name="CDC2021"/> There is no evidence of an association between MMR immunisation and autistic spectrum disorders.<ref name="pmid 34806766">Template:Cite journal</ref><ref>Template:Cite journal</ref><ref name=AFP2017>Template:Cite journal</ref> The MMR vaccine is a mixture of live weakened viruses of the three diseases.<ref name="CDC2021"/>
The MMR vaccine was developed by Maurice Hilleman.<ref name=Mau2005>Template:Cite journal</ref> It was licensed for use in the US by Merck in 1971.<ref name=Good2015/> Stand-alone measles, mumps, and rubella vaccines had been previously licensed in 1963, 1967, and 1969, respectively.<ref name=Good2015>Template:Cite journal</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Recommendations for a second dose were introduced in 1989.<ref name=Good2015/> The MMRV vaccine, which also covers chickenpox, may be used instead.<ref name="CDC2021"/> An MR vaccine, without coverage for mumps, is also occasionally used.<ref name=WHO2014Sheet>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Medical useEdit
Cochrane concluded that the "Existing evidence on the safety and effectiveness of MMR and MMRV vaccine supports current policies of mass immunisation aimed at global measles eradication to reduce morbidity and mortality associated with measles mumps rubella and varicella."<ref name="pmid 34806766" />
The combined MMR vaccine induces immunity less painfully than three separate injections at the same time, and sooner and more efficiently than three injections given on different dates. Public Health England reports that providing a single combined vaccine as of 1988, rather than giving the option to have them also done separately, increased uptake of the vaccine.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
MeaslesEdit
Before the widespread use of a vaccine against measles, rates of disease were so high that infection was felt to be "as inevitable as death and taxes."<ref>Template:Cite journal</ref> Reported cases of measles in the United States fell from hundreds of thousands to tens of thousands per year following introduction of the vaccine in 1963. Increasing uptake of the vaccine following outbreaks in 1971, and 1977, brought this down to thousands of cases per year in the 1980s. An outbreak of almost 30,000 cases in 1990 led to a renewed push for vaccination and the addition of a second vaccine to the recommended schedule. Fewer than 200 cases have been reported in the US each year between 1997 and 2013, and the disease is no longer considered endemic there.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite book</ref>
The benefit of measles vaccination in preventing illness, disability, and death has been well documented. The first 20 years of licensed measles vaccination in the US prevented an estimated 52 million cases of the disease, 17,400 cases of intellectual disability, and 5,200 deaths.<ref>Template:Cite journal</ref> During 1999–2004, a strategy led by the World Health Organization and UNICEF led to improvements in measles vaccination coverage that averted an estimated 1.4 million measles deaths worldwide.<ref name="pmid 16528234">Template:Cite journal</ref> Between 2000 and 2018, measles vaccination resulted in a 73% decrease in deaths from the disease.<ref name="WHO Measles Fact Sheet" />
Measles is common in many areas of the world. Although it was declared eliminated from the US in 2000, high rates of vaccination and good communication with people who refuse vaccination are needed to prevent outbreaks and sustain the elimination of measles in the US.<ref name=Parker/> Of the 66 cases of measles reported in the US in 2005, slightly over half were attributable to one unvaccinated individual who acquired measles during a visit to Romania.<ref>Template:Cite journal</ref> This individual returned to a community with many unvaccinated children. The resulting outbreak infected 34 people, mostly children and virtually all unvaccinated; 9% were hospitalized, and the cost of containing the outbreak was estimated at $167,685. A major epidemic was averted due to high rates of vaccination in the surrounding communities.<ref name=Parker>Template:Cite journal</ref>
In 2017, an outbreak of measles occurred among the Somali-American community in Minnesota, where MMR vaccination rates had declined due to the misconception that the vaccine could cause autism. The US Centers for Disease Control and Prevention recorded 65 affected children in the outbreak by April 2017.<ref>Template:Cite journal</ref>
RubellaEdit
Rubella, also known as German measles, was also very common before widespread vaccination. The major risk of rubella is during pregnancy when the baby may contract congenital rubella, which can cause significant congenital defects.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
MumpsEdit
Mumps is another viral disease that was once very common, especially during childhood. If mumps is acquired by a male who is past puberty, a possible complication is bilateral orchitis, which can in some cases lead to sterility.<ref>Template:Cite book</ref>
AdministrationEdit
The MMR vaccine is administered by a subcutaneous injection, the first dose typically at twelve months of age.<ref name="CDCAdmin"/> The second dose may be given as early as one month after the first dose.<ref name=Vesikari/> The second dose is a dose to produce immunity in the small number of persons (2–5%) who fail to develop measles immunity after the first dose. In the US it is done before entry to kindergarten because that is a convenient time.<ref name=CDC-MMR-FAQ>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Areas where measles is common typically recommend the first dose at nine months of age and the second dose at fifteen months of age.<ref name=WHO2017Pos/>
SafetyEdit
Adverse reactions, rarely serious, may occur from each component of the MMR vaccine. Ten percent of children develop fever, malaise, and a rash 5–21 days after the first vaccination;<ref>Template:Cite journal</ref> and 3% develop joint pain lasting 18 days on average.<ref>Template:Cite journal</ref> Older women appear to be more at risk of joint pain, acute arthritis, and even (rarely) chronic arthritis.<ref name=Schattner>Template:Cite journal</ref> Anaphylaxis is an extremely rare but serious allergic reaction to the vaccine.<ref>Template:Cite journal</ref> One cause can be egg allergy.<ref name="pmid14601358">Template:Cite journal</ref> In 2014, the FDA approved two additional possible adverse events on the vaccination label: acute disseminated encephalomyelitis (ADEM), and transverse myelitis, with permission to also add "difficulty walking" to the package inserts.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> A 2012 IOM report found that the measles component of the MMR vaccine can cause measles inclusion body encephalitis in immunocompromised individuals. This report also rejected any connection between the MMR vaccine and autism.<ref>Template:Cite book</ref> Some versions of the vaccine contain the antibiotic neomycin and therefore should not be used in people allergic to this antibiotic.<ref name=AFP2017/>
The number of reports on neurological disorders is very small, other than evidence for an association between a form of the MMR vaccine containing the Urabe mumps strain and rare adverse events of aseptic meningitis, a form of viral meningitis.<ref name=Schattner/><ref>Template:Cite book</ref> The UK National Health Service stopped using the Urabe mumps strain in the early 1990s due to cases of transient mild viral meningitis, and switched to a form using the Jeryl Lynn mumps strain instead.<ref name=Colville>Template:Cite journal</ref> The Urabe strain remains in use in a number of countries; MMR with the Urabe strain is much cheaper to manufacture than with the Jeryl Lynn strain,<ref>Template:Cite journal</ref> and a strain with higher efficacy along with a somewhat higher rate of mild side effects may still have the advantage of reduced incidence of overall adverse events.<ref name=Colville/>
A Cochrane review found that, compared with placebo, MMR vaccine was associated with fewer upper respiratory tract infections, more irritability, and a similar number of other adverse effects.<ref name="pmid 34806766" />
Naturally acquired measles often occurs with immune thrombocytopenic purpura (ITP, a purpuric rash and an increased tendency to bleed that resolves within two months in children), occurring in 1 to 20,000 cases.<ref name="pmid 34806766" /> Approximately 1 in 40,000 children are thought to acquire ITP in the six weeks following an MMR vaccination.<ref name="pmid 34806766" /> ITP below the age of six years is generally a mild disease, rarely having long-term consequences.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>
False claims about autismEdit
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In 1998 Andrew Wakefield et al. published a fraudulent paper about twelve children, reportedly with bowel symptoms and autism or other disorders acquired soon after administration of MMR vaccine,<ref>Template:Cite journalTemplate:Retracted</ref> while supporting a competing vaccine. In 2010, Wakefield's research was found by the General Medical Council to have been "dishonest",<ref>Template:Cite newsTemplate:Cbignore</ref> and The Lancet fully retracted the paper.<ref>Template:Cite journal</ref><ref>Template:Cite news</ref> Three months following The Lancet's retraction, Wakefield was struck off the UK medical register, with a statement identifying deliberate falsification in the research published in The Lancet,<ref name=gmc-uk_Wakefield_SPM>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and was barred from practising medicine in the UK.<ref name=MeikleBoseley>Template:Cite news</ref> The research was declared fraudulent in 2011 by the British Medical Journal.<ref>Template:Cite journal</ref>
Since Wakefield's publication, multiple peer-reviewed studies have failed to show any association between the vaccine and autism.<ref name="pmid 34806766" /><ref name=NHS /> The US Centers for Disease Control and Prevention,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> the Institute of Medicine of the US National Academy of Sciences,<ref>Template:Cite book</ref> the UK National Health Service<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and the Cochrane Library review<ref name="pmid 34806766" /> have all concluded that there is no evidence of a link.
Administering the vaccines in three separate doses does not reduce the chance of adverse effects, and it increases the opportunity for infection by the two diseases not immunized against first.<ref name=NHS>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>MMR vs three separate vaccines:
- Template:Cite journal
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- Template:Cite journal</ref> Health experts have criticized media reporting of the MMR-autism controversy for triggering a decline in vaccination rates.<ref>Template:Cite news</ref> Before publication of Wakefield's article, the inoculation rate for MMR in the UK was 92%; after publication, the rate dropped to below 80%. In 1998, there were 56 measles cases in the UK; by 2008, there were 1348 cases, with two confirmed deaths.<ref>Template:Cite journal</ref>
In Japan, the MMR triplet is not used. Immunity is achieved by a combination vaccine for measles and rubella, followed up later with a mumps only vaccine. This has had no effect on autism rates in the country, further disproving the MMR autism hypothesis.<ref>Template:Cite journal</ref>
HistoryEdit
The component viral strains of MMR vaccine were developed by propagation in animal and human cells.<ref name="pmid12962524">Template:Cite journal</ref>
For example, in the case of mumps and measles viruses, the virus strains were grown in embryonated chicken eggs. This produced strains of virus which were adapted for chicken cells and less well-suited for human cells. These strains are therefore called attenuated strains. They are sometimes referred to as neuroattenuated because these strains are less virulent to human neurons than the wild strains.
The rubella component, Meruvax, was developed in 1967, through propagation using the human embryonic lung cell line WI-38 (named for the Wistar Institute) that was derived six years earlier in 1961.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>
| Disease immunized | Component vaccine | Virus strain | Propagation medium | Growth medium | |
|---|---|---|---|---|---|
| Measles | Attenuvax | citation | CitationClass=web
}}</ref> |
chick embryo cell culture | Medium 199 |
| Mumps | Mumpsvax<ref name="Merck_Mumpsvax_1999_pdf">{{#invoke:citation/CS1|citation | CitationClass=web
}}</ref> |
Jeryl Lynn (B level) strain<ref name="Jeryl_Lynn_1967_pdf">Template:Cite journal</ref> | ||
| Rubella | Meruvax II | Wistar RA 27/3 strain of live attenuated rubella virus | WI-38 human embryonic cell line | MEM (solution containing buffered salts, fetal bovine serum, human serum albumin and neomycin, etc.) |
The term "MPR vaccine" is also used to refer to this vaccine, whereas "P" refers to parotitis which is caused by mumps.<ref name="mpr"/>
Merck MMR II is supplied freeze-dried (lyophilized) and contains live viruses. Before injection, it is reconstituted with the solvent provided.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
According to a review published in 2018, the GlaxoSmithKline (GSK) MMR vaccine known as Pluserix "contains the Schwarz measles virus, the Jeryl Lynn–like mumps strain, and RA27/3 rubella virus".<ref name="plotkin18">Template:Cite book</ref>
Pluserix was introduced in Hungary in 1999.<ref name=borocz20/> Enders' Edmonston strain has been used since 1999 in Hungary in Merck MMR II product.<ref name="borocz20">Template:Cite journal</ref> GSK Priorix vaccine, which uses attenuated Schwarz Measles, was introduced in Hungary in 2003.<ref name=borocz20/>
MMRV vaccineEdit
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The MMRV vaccine, a combined measles, mumps, rubella, and varicella (chickenpox) vaccine, has been proposed as a replacement for the MMR vaccine to simplify the administration of the vaccines.<ref name=Vesikari>Template:Cite journal</ref> Preliminary data indicate a rate of febrile seizures of 9 per 10,000 vaccinations with MMRV, as opposed to 4 per 10,000 for separate MMR and varicella shots; US health officials therefore, do not express a preference for use of MMRV vaccine over separate injections.<ref name=klein08>Template:Cite journal</ref>
In a 2012 study<ref>Template:Cite journal</ref> pediatricians and family doctors were sent a survey to gauge their awareness of the increased risk of febrile seizures (fever fits) in the MMRV. 74% of family doctors and 29% of pediatricians were unaware of the increased risk of febrile seizures. After reading an informational statement only 7% of family doctors and 20% of pediatricians would recommend the MMRV for a healthy 12- to 15-month-old child. The factor that was reported as the "most important" deciding factor in recommending the MMRV over the MMR+V was ACIP/AAFP/AAP recommendations (pediatricians, 77%; family physicians, 73%).
MR vaccineEdit
This is a vaccine that covers measles and rubella but not mumps.<ref name=WHO2014Sheet/> As of 2014, it was used in a "few (unidentified) countries".<ref name=WHO2014Sheet/>
Society and cultureEdit
Religious concernsEdit
Some brands of the vaccine use gelatin, derived from pigs, as a stabilizer.<ref name="PHE" /> This has caused reduced take-up among some communities,<ref name="PHE" /><ref>Template:Cite news</ref> despite the fact that alternative vaccines without pig derivatives are approved and available.<ref name="PHE">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
ReferencesEdit
Further readingEdit
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External linksEdit
Template:Vaccines Template:GlaxoSmithKline Template:Portalbar Template:Authority control