White House/#HHS/#NIH haven't confirmed: @nytimes reports Operation #WarpSpeed has selected its five #COVID19 #vaccines candidates: 
$MRNA/NIH, $AZN/Oxford, $JNJ, $PFE &amp; $MRK.

Merck just jumped in last week, so they are basing that selection on what?
https://t.co/XcXRWbHc4X