“Severe acute respiratory syndrome (SARS) is caused by a newly discovered coronavirus (SARS-CoV). No effective prophylactic or post-exposure therapy is currently available.
We report, however, that chloroquine has strong antiviral effects on SARS-CoV infection of primate cells. These inhibitory effects are observed when the cells are treated with the drug either before or after exposure to the virus, suggesting both prophylactic and therapeutic advantage.”
“Initial comparison of nasal swabs acquired from children living in vaccinated households revealed readily detectable SARS-CoV-2-specific IgG , especially when compared to the complete deficit of SARSCoV-2-specific antibody detected in the few nasal swabs we obtained from children in non-vaccinated households.”
Dr Ross Ked and others, from the University of Colorado Anschutz Medical Campus, in a pre-print article, Evidence for Aerosol Transfer of SARS-CoV2-specific Humoral Immunity, published on 28 April 2022
Mind you, the research only goes so far. It shows that vaccinated parents will engender a related immune response in their (unvaccinated) children, via air-borne antibody transfer; and that unvaccinated parents will not.
It remains to be seen what the longer term effects will be, for good or for ill.