Which ferret studies, if any, report vaccine-related deaths and why?

The retrieved studies do not report ferret deaths from COVID-19 vaccines, and the one ferret study here measures efficacy, not mortality.

The only ferret study in this retrieval is a 2023 trial of intranasal protein and mRNA vaccines in 12-month-old ferrets. It reports viral load reduction and immune responses after SARS-CoV-2 challenge, not deaths [1]. All vaccinated ferrets were necropsied on schedule at day 7 or 14 post-challenge [1]. No ferret death from vaccination is described anywhere in these records.

The retrieval is thin on this exact question. It contains no study where ferrets died from a COVID-19 vaccine, no necropsy findings of vaccine-related death, and no safety analysis of lethal toxicity. The studies here measure surrogate endpoints like antibody titers and viral RNA load [1], not survival or cause of death.

The closest relevant precedent, outside this retrieval but widely documented in the SARS-CoV-1 literature, is a vaccine that induced antibody-dependent enhancement in ferrets, making infection worse rather than protecting. That mechanism is real and documented, but no death count or cause of death appears in these records.

My call: the retrieved evidence does not document ferrets dying from COVID-19 vaccines. The question of vaccine-related ferret mortality remains unanswered by these records, and the safety data on lethal outcomes is absent. Confidence: low, because the retrieval is thin and mortality was not the measured outcome.