Amendments are sent to the legislatures of the  states by default. Only one amendment, the 21st, specified a  convention. In any case, passage by the legislature or convention  is by simple majority.
Yes, there is a MMRV VIS, as well as a MMR VIS and a Varicella VIS. The law requires that a Vaccine Information Statement (VIS) be given out whenever certain vaccinations are administered, including MMR, varicella or MMRV vaccines.hen the first dose of measles, mumps, rubella, and varicella vaccines is administered at ages 48 months and older, use of MMRV vaccine generally is preferred over separate injections of MMR and varicella vaccines.
Vaccines for Measles, Mumps, and Rubella. Safe and effective live-virus vaccines for measles, mumps, and rubella have been developed over recent decades. They are usually combined in children as the measles, mumps, and rubella (MMR) vaccine. Individual live-virus vaccines or the combined MMR may be given to adults, depending on their risk factors. Measles-Mumps-Rubella (MMR) Vaccine in Early Childhood.