The data, which has not yet been peer reviewed, is preliminary but promising.
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In the experiments, scientists took blood samples from people who have already been vaccinated and tested it against variants in a laboratory. This type of experiment can offer a rough sense of whether the vaccine will work against a new variant.
The Moderna vaccine appeared to work against all variants, as indicated by so-called "neutralizing antibody titers."
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Some of the variants -- including Delta (first identified in India), Beta (first identified in South Africa), and Gamma (first identified in Brazil) -- showed a slight reduction in these neutralizing antibody titers, but scientists say these slight reductions aren't enough to evade the vaccine.
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This type of experiment does not indicate an exact percentage of how effective Moderna's vaccine is likely to be against each variant.
A prior real-world study from the United Kingdom indicated the Pfizer vaccine, which uses a similar mRNA technology, was 88% effective against the Delta variant in terms of protecting people from symptomatic disease.
Taken collectively, these studies are encouraging news that mRNA vaccines are holding up against the Delta variant.