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Moderna also announced Tuesday that a new study showed its vaccine also produced promising protection in a lab setting against the Delta variant and others currently circulating. Moderna was 95 percent. Confirman Que La Vacunas De Moderna Produce Anticuerpos Contra La Variante Delta Coronavirus Updates The delta variant is the fast-moving strain of the coronavirus now found in 96 countries. Moderna delta variante . The mRNA vaccine from Pfizer and BioNTech may be less effective than Moderna s against the delta variant of the coronavirus according to two. Moderna Says Its Vaccine Is Effective Against The Delta Variant. One recent study showed the Pfizer vaccine was 84 effective against the variant after two doses but only 34 effective after the first dose. Sanjay Gupta answers viewers questions about the Delta variant 2255 CNN Modernas Covid-19 vaccine protects people for at least six months and likely longer -- even against new variants. A new study found the Moderna. COVID...