Scientists from the Institut Pasteur (CNRS joint unit), in collaboration with Hopital Europeen Georges Pompidou (AP-HP), Orleans Regional Hospital and Strasbourg University Hospital, demonstrated that the Delta variant is less sensitive to neutralizing antibodies than the Alpha variant.Sera from people vaccinated with two doses of mRNA vaccine effectively neutralized the Delta variant. Sera from individuals who had received a single dose of specific vaccines were inactive or barely active against the Delta and Beta variants.
