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.
The second dose of MMR should be administered routinely at school entry (age 4 to 6 years), but can be given as early as 1 month after the first dose if the dose was administered at or after 12 months of age.MR vaccine should be administered for both doses. The first dose of MMR vaccine should be administered routinely at 12 to 15 months of age. Children who receive measles-containing vaccine before 12 months of age should receive additional doses of MMR when they are 12 to 15 months of age and at 4 to 6 years of age.