Yes actually, for several reasons. One, commercial viability - while "best efforts" would in theory be buying up all those 27 sites and pumping out billions of AZ vaccine, given they didn't know it would actually be viable as a product until a month ago, it would have been reckless to do so and, obviously, not doable anyway for reason two; those sites still produce other vaccines. The flu vaccine etc. don't just stop happening. Which leads to point number three - of those 27 sites, it says quite clearly that includes packaging sites. There's dozens of vaccines in development, taking up contracts with dozens of sites.
Four, there's precedent that this is the standard - Pfizer have a facility in Puurs, Belgium that was hit with production issues and had to slow down. A second factory doesn't come online until mid-February in Marburg, Germany for them. So there's no evidence that AZ are doing anything below what is an industry standard effort.
Five, AZ have a manufacturing supply chain worldwide for this. It is standard practice to have one/two factories for millions of doses, as seen below.
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The same issue could arise in any of them. To quote the Guardian:
When talking about "best efforts", this variation is important.
The EU would have to prove AZ did something radically negligent as opposed to other vaccine companies. As I said yesterday, good luck to them with that, as I can see basically nothing, as what happened to AZ could easily have happened to Pfizer, Moderna et al.