New guidelines issued on Wednesday say that people should consume less alcohol “for better overall health” and “limit alcohol beverages,” but they don’t recommend clear limits.

At least half of the eight new members of a C.D.C. panel, who are meeting for the first time on Wednesday, have expressed some skepticism about vaccines.

“The consortia for H.I.V./AIDS vaccine development and immunology was reviewed by N.I.H. leadership, which does not support it moving forward,” said a senior official at the National Institutes of Health who was not authorized to speak on the matter and asked not to be identified.

“When it comes to just perceiving dog emotions, we think we know what’s happening,” one of the authors said. “But we’re actually subconsciously relying on a lot of other factors.”

Dennis Overbye, The New York Times’s “cosmic affairs correspondent,” during a visit to The Scripps Research Institute in La Jolla, Calif., in 2011.

Surgeon General Vivek Murthy’s announcement follows years of recommendations by top health officials to view firearm deaths through the lens of health rather than politics.

Sulemana Musah, a schoolteacher in Accra, Ghana, started feeling sick in 2011, while he was a student, but he didn’t receive a hepatitis C diagnosis until 2017.

Deborah Sebi, right, a nurse at a mobile clinic in Teshie, a fishing village in Ghana, prepared an immunization for Rebecca Bamembaye’s 3-month-old, Doris.