Latest article on the link between the Pandemrix vaccine and Narcolepsy

Interesting article, here's my question

why does the CDC keep saying there are no known batches of any US flu vaccines that have been linked to Narcolepsy?

I have heard of at least 14 USA cases. I do understand that's a low number in USA compared to what Europe got hit with but why the secrets, just be proactive and help EVERYONE.