@BowsacNoodle @Shadowman311 "Antibodies injections over vaccination — things like RSV have antibody injections that give a few months of coverage when baby is most vulnerable. These are good."
Do we have the money to give that to every baby, especially as you note, when it only works for a few months? And in practice this doesn't work for adults after they get a bug.
We don't have a RSV vaccine for neonates because it turned out to be damned hard to make any that was safe. In the '60s a simple inactivated whole virus one was tried, and, damn, this was a challenge (Phase I) trial per Wikipedia (which otherwise matches my memory)! As in, the subjects were exposed to the virus, 5% of the controls hospitalized, 80% on the vaccine arm, including two deaths.
The problem turned out to be a floppy protein, stabilizing it resulted in a vaccine that can be used on adults, and this lead directly to a similar path for the better SARS type coronavirus vaccines.
The anti-vaxxers screamed endlessly the original SARS vaccine test, again a simple inactivated virus, killed all the animals it was tested on!!! Like scientists weren't problem solvers. Per Wikipedia a 2013 paper pointed out the stability problem for RSV, and per the second link below a solution was found for SARS type coronviruses in 2017.
Which all the US authorized vaccines used, except Janssen added a third stabilization to it's ultimately too high severe adverse effects single dose vaccine. The Oxford clown show didn't for some reason, their efficacy was lower with two quick back to back doses, adverse effect rates were't good, and both used adenovirus vectors.
A family which had never made it past a European sized Phase II trial, and produced blood clotting problems, per a paper I glanced at for Oxford's, due to something on the (chimpanzee) virus' surface. Not of much interest, AZ which was strong armed into making the vaccine (not previously a business line for them) tried a US sized Phase III trail but didn't submit an application to the FDA.
Although maybe part of that was the criminal clown show of a notorious grifting company, though multiple administrations, W, Obama, Trump 1.0, that wasn't competent when it came to spinning up production of it and Janssen's in their US facility in Baltimore. Among other things they tried to make both in the same facility and got cross contamination.
Sputnik V was also of this type, and their claims of no adverse reactions were an obvious lie, all vaccines have a small rate of anaphylaxis. One reason my pediatrician's office in the 1970s maintained a portable kit that included epinephrine for injection and a small oxygen bottle, why today Walmart etc. asks you to hang around for fifteen minutes so they can Epipen you if needed.
https://en.wikipedia.org/wiki/Respiratory_syncytial_virus_vaccine
https://cen.acs.org/pharmaceuticals/vaccines/tiny-tweak-behind-COVID-19/98/i38