FRANKFURT, Nov 13 (Reuters) - BioNTech said

on Thursday that its collaboration with Pfizer ( PFE ) has not

changed, when asked to comment on a report that Pfizer ( PFE ) is

looking to sell its stake in the German biotech firm.

"We continue to have a close and strong collaboration," a

spokesperson said in a statement, adding that BioNTech would not

be commenting on any capital market activities by Pfizer ( PFE ).