First the photo is fine, not great, not newsworthy. But as was said if it's a documentary photo, it's fine. As a news photo it is, as was also said, "a little bit late."
OK, let's get a little political... the irony of this photograph to me is that those people have more than likely been vaccinated for Polio when they were young, the same as me and most likely you. And, that is the reason for them being able to "stand" there and not being confined a wheel chair or leg braces in that photo. I still remember the day my family was first vaccinated for Polio. We weren't afraid, there was no one protesting getting vaccinated. Everyone that day who lined up for the vaccine was relieved and glad to be standing in line. It represented hope for a better future without Polio. Times change. People change.
That said, they are entitled to their own opinion. They are entitled to protest as well. Enough said...