Nothing in either of those articles says a vaccine is “unlikely to work.”
….
There is some concern that we won’t find one. That is possible. But likely? If anyone is saying that it’s likely that we won’t find one that works (and I haven’t read anyone saying that) they’re in the minority.[/quote]
?
“unlikely to work” = “won’t find one” = “won’t find one that works”.
If we “find” a vaccine and it doesn’t work, then it wasn’t a vaccine, was it?