Moderna’s Covid-19 vaccine, which the company claim to have 94 percent efficacy, causes the human immune system to produce potent antibodies that last for least three months.
Researchers at the National Institute for Allergies and Infectious Diseases (NIAID), which co-developed the drug, studied the immune response of 34 adult participants, young and old, from the first stage of a clinical trial.
Writing in the New England Journal of Medicine, they said that the antibodies, which stop the SARS-CoV-2 virus from invading human cells, declined slightly over time, as expected, but they remained elevated in all participants 3 months after the booster vaccination.
NIAID director Anthony Fauci and other experts have said it’s very likely that the immune system will remember the virus if re-exposed later on, and then produce new antibodies.
The vaccine which is called mRNA-1273, is administered in two injections given 28 days apart.