At least one component of this concern is that there is a vaccine candidate being developed, by the Beijing Institute of Biotechnology, which is actually their Military research facility (a bit like Walter Reed) that is using the Adenovirus 5 vector as its delivery platform. This is the AdV5 which showed enhancing immunity in 2 phase III efficacy trials of a candidate HIV vaccine—and led to higher rates of HIV acquisition (at least among men) in the vaccine than placebo arms. Susan Buchbinder, Larry Corey and others published a piece in The Lancet recently raising this alarm and warning that AdV5 vectored vaccines should not be used where COVID and HIV co-circulate, as in much of the world. I will attach here. It seems there is community concern which has spilled over to all COVID vaccines. We’ve seen no evidence of enhancing immunity with any of the other COVID vaccines, and of course right now only AstraZeneca is using an Adenovirus vector, but that is a Chimp adenovirus and non-replication competent in humans. The mRNA vaccines are a different technology altogether, but this isn’t clear to many, as we know.
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)32156-5/fulltext
