vac·cine
/vak'sen/ noun
... a substance used to stimulate the production of antibodies and provide IMMUNITY against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an ANTIGEN without inducing the disease.
"there is NO vac cine against the virus" ... A vac cine is a prohibitive prevention like the mumps and measles vac cines that PREVENT infection whereas these so called vac cines only mitigate the effects if contracting the virus,
or exosomes!!
ANTIGEN: : any substance (such as an immunogen or a hapten) foreign to the body that evokes an immune response either alone or after forming a complex with a larger molecule (such as a protein) and that is capable of binding with a product (such as an antibody or T cell) of the immune response.