RSV is the most common cause of hospitalization in babies, but Sanofi is one of a few companies producing a shot that can help prevent this potentially severe illness. CNN’s Meg Tirrell tours one of their facilities.

A pharmaceutical facility is producing Bayfordis, a shot designed to prevent severe respiratory syncytial virus (RSV) disease in babies, which is a leading cause of infant hospitalizations. The shot, containing antibodies that block RSV infection, has only been available for a short time and is one of two new protective measures alongside a vaccine for pregnant women.

Recent data indicate that RSV hospitalizations among the youngest babies were reduced by more than half following the introduction of Bayfordis. However, only about two-thirds of babies received the shot last season, partly due to limited public awareness. Experts suggest that broader uptake could significantly reduce RSV-related hospitalizations in vulnerable infants.

This drug could prevent severe RSV disease for babies

Inside this pharmaceutical plant, they are packaging a shot that prevents the most common cause of hospitalization in babies. The respiratory syncytial virus, or RSV, can cause severe disease for babies, especially the younger, smaller ones. So this shot, called Bayfordis, it's really only been available for a couple seasons. It's one of two new forms of protection for babies, along with a vaccine for pregnant moms. But only about two-thirds of babies got this protection last season, so increasing that uptake could really help a lot. Shoe covers, okay. Your hairnet. Ready to go. So you can actually see the drug here in this syringe, and it contains antibodies that block RSV's ability to infect cells. All of these steps have to be done incredibly precisely, like here, inserting the plunger rods into the syringes. You don't want any liquid to come out of the tip cap and all that stuff. You don't want to disturb, actually, the sterility of the device. That's why it's the most important step in the whole process. Wow. The shot comes in two doses. This one with the purple plunger is for the smaller, tinier babies. And thanks in part to this shot, RSV hospitalizations for the youngest babies were cut by more than half last season. The thing is, those findings come from this CDC study, which, experts pointed out, wasn't widely publicized by the Trump administration. So Sanofi, the maker of this shot, and others are having to fill that information gap. Do you notice a difference in the current environment, either from the regulatory standpoint or even the receptivity of people who get the products? Obviously, there are unique aspects to the current environment that we're in, but we're not seeing anything that would deter us from our mission. The administration says nothing's changed about the way it promotes the shot. If all babies were able to get this kind of protection, what kind of difference would we see? Massive. It would flatten the hospitalization wave that we see from RSV in this very vulnerable young population.

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