Which is great, animal models for viral diseases are easy to prove out (if they get the virus you get some information testing antibodies in them).

The antibody itself was identified from a sample taken from a human and looks like an interesting target for a vaccine or monoclonal antibody therapy (there's lot of RSV candidates in the pipeline https://www.sciencedirect.com/science/article/pii/S147330992... ).

At this point, unless the title explicitly states a new breakthrough has been seen in humans, I immediately assume they're talking about mice or a test tube.