By Brenda Goodman, CNN

(CNN) — In a further jolt to the process of reviewing and recommending vaccines at the US Centers for Disease Control and Prevention, another group of outside advisers to the agency was abruptly sidelined this week .

In an email sent late Thursday evening, which was obtained by CNN, members of roughly 30 medical and public health organizations who serve as liaison members of the CDC’s Advisory Committee on Immunization Practices, or ACIP, were told they could no longer participate in the committee’s crucial workgroups.

Liaison members don’t vote at ACIP’s public meetings on vaccine recommendations, but they can participate by asking questions and commenting on presentations. Behind the scenes, they have also historically done important work undertaking detaile

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