Dr. Anthony S. Fauci made the rounds of the morning TV news shows on Sunday, trying to quell confusion over the latest federal pandemic guidance for the start of school in the fall as well as growing questions about the necessity of booster shots.

On Sunday, Israel’s health ministry announced that it would begin offering boosters to adults with weakened immune systems who already had two doses of the Pfizer-BioNTech vaccine, in light of the rising number of cases there caused by the Delta variant of the coronavirus. The news was first reported by Reuters.

Asked about the development on CNN’s “State of the Union,” Dr. Fauci emphasized that the Centers for Disease Control and Prevention was committed to following the science and said that boosters were not recommended “right now,” given that more than 90 percent of new Covid-related hospitalizations were in unvaccinated patients.

But he did not rule out the possibility that boosters might eventually be advisable for certain populations.

developing a vaccine targeted to the Delta variant and also had promising results from studies of people who received a booster shot. With a third shot, “you get five to 10 times the number of antibodies that you had from the second dose,” Dr. Scott Gottlieb, the former head of the Food and Drug Administration who is now on Pfizer’s board, said on the CBS program “Face the Nation.”

But while Dr. Gottlieb noted that Pfizer and federal agencies would be meeting early in the week to discuss the data on boosters, Dr. Fauci said that

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