Second dose of COVID-19 vaccine is critically important Second dose of COVID-19 vaccine is critically important By Chancelor Winn | February 5, 2021 at 7:31 AM CST - Updated February 5 at 7:31 AM PASCAGOULA, Miss. (WLOX) - Thousands of people are receiving their second dose of the vaccine this week. Getting that second shot is a critical move in the vaccination process, according to health experts. At the Jackson County Fairgrounds on Thursday, the line moved quickly as many showed up for their second dose. Getting the second injection is crucial to ensuring that the vaccination is effective. Multiple positive cases have been reported after people received their first dose, said Jason Ely, Singing River Health’s Director of Primary Care.