Bennett said the preliminary results showed “a very high likelihood that the fourth dose will protect vaccinated people to a great degree against infection to some degree and against severe symptoms,” according to the Post.

Bennett said at Sheba Medical Center, “A week into the fourth dose, we know to a higher degree of certainty that the fourth dose is safe,” adding, “The second piece of news: We know that a week after administration of a fourth dose, we see a five-fold increase in the number of antibodies in the vaccinated person. This most likely means a significant increase against infection and… hospitalization and [severe] symptoms,” reports Reuters.

Side effects reported from the vaccine were similar to those of the second and third shots. Recipients reported fever, fatigue, and headaches, notes Reuters.