<qa>  What is the first dose at study entry?At study entry Day 0, participants will be randomly assigned to receive either the TV003 vaccine or a placebo vaccine for TV003. All participants will receive two doses of TV003 or placebothe first dose at study entry Day 0 and the second dose 6 months later on Day 180. Additional study visits will occur on Days 6, 9, 12, 15, 28, 56, 72, 186, 189, 192, 195, 208, 236, 252, and 360. 