According to Pfizer's accompanying paperwork with the vaccine, the contents, mRNA, create a portion of the Covid virus DNA within the recipient. That partial strand creates an immune response. Hence the name spike protein. Said another way, a cytokine storm, or an immune response, is solicited from the mRNA. Shedding which is discussed by the vaccine manufacturers is not innocuous. Shedding means that the recipient of the jab is contagious. Shedding can occur up to thirty days post injections say medical professionals and pharmaceutical researchers. Could it be that the term "shedding" is used because people are unfamiliar with the term?