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MMR vaccine may protect against COVID-19, says study

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The measles-mumps-rubella (MMR) vaccine may provide protection against COVID-19, according to a study that could also explain why children have a much lower case rate and death rate of the disease than adults.

The MMR vaccine has been theorized to provide protection against COVID-19, and now the study, published in the journal mBio, provides further proof of this by showing that mumps IgG titers, or levels of IgG antibody, are inversely correlated with severity in recovered COVID-19 patients previously vaccinated with the MMR II vaccine.

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MMR II contains the Edmonston strain of measles, the Jeryl Lynn (B-level) strain of mumps, and the Wistar RA 27/3 strain of rubella, the researchers said.

“We found a statistically significant inverse correlation between mumps titer levels and COVID-19 severity in people under age 42 who have had MMR II vaccinations,” said lead study author Jeffrey E. Gold, president of World Organization in Georgia, US.

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“This adds to other associations demonstrating that the MMR vaccine may be protective against COVID-19. It also may explain why children have a much lower COVID-19 case rate than adults, as well as a much lower death rate,” said Gold, adding that the majority of children get their first MMR vaccination around 12 to 15 months of age and a second one from 4 to 6 years of age.

The researchers divided 80 subjects into 2 groups. The MMR II group consisted of 50 U.S. born subjects who would primarily have MMR antibodies from the MMR II vaccine.

A comparison group of 30 subjects had no record of MMR II vaccinations, and would primarily have MMR antibodies from other sources, including prior measles, mumps, and/or rubella illnesses.

The researchers found a significant inverse correlation between mumps titers and COVID-19 severity within the MMR II group.

There were no significant correlations between mumps titers and disease severity in the comparison group, between mumps titers and age in the MMR II group, or between severity and measles or rubella titers in either group, they said.

Within the MMR II group, mumps titers of 134 to 300 AU/ml were only found in those who were functionally immune or asymptomatic, according to the researchers. All with mild COVID-19 symptoms had mumps titers below 134 AU/ml.

All with moderate symptoms had mumps titers below 75 AU/ml. All who had been hospitalised and required oxygen had mumps titers below 32 AU/ml.

“This is the first immunological study to evaluate the relationship between the MMR II vaccine and COVID-19. The statistically significant inverse correlation between mumps titers and COVID-19 indicates that there is a relationship involved that warrants further investigation,” said study co-author David J. Hurley professor and molecular microbiologist at the University of Georgia.

“The MMR II vaccine is considered a safe vaccine with very few side effects. If it has the ultimate benefit of preventing infection from COVID-19, preventing the spread of COVID-19, reducing the severity of it, or a combination of any or all of those, it is a very high reward low risk ratio intervention, Hurley said.

“Maximum seropositivity is achieved through two vaccinations at least 28 days apart. Based upon our study, it would be prudent to vaccinate those over 40 regardless of whether or not they already have high serum MMR titers,” he added.

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