The NSA and FBI are built around secrecy and preventing leaks. Their opaqueness is a huge part of their advantage. They keep information from the general public

The NSA and FBI are built around secrecy and preventing leaks. Their opaqueness is a huge part of their advantage. They keep information from the general public as a rule. Everyone involved is vetted and knows the punishment for insubordination. The CDC is for the benefit of the public. Peoples trust in them is needed in order to be effective. It is pretty transparent in that you can usually look at the data they are using to support their guidelines. If they were keeping something secret the chance of a leak is much greater and there is data from other countries that can be used to corroborate their conclusions.