Three prime federal well being officers appeared on Capitol Hill on Thursday and implored People to get vaccinated towards the coronavirus, however stated little in regards to the investigation into whether or not the Johnson & Johnson vaccine could also be linked to a small variety of instances of uncommon blood clots, or when that vaccine could be put again into use.

“Hopefully we’ll get a call fairly quickly, as as to whether or not we will get again on monitor with this very efficient vaccine,” Dr. Anthony S. Fauci, President Biden’s prime medical adviser for the coronavirus, instructed a Home panel.

Dr. Fauci’s feedback got here as the way forward for the Johnson & Johnson one-shot vaccine hung within the stability. Earlier this week, the Meals and Drug Administration and the Facilities for Illness Management and Prevention known as for a pause in using the vaccine within the wake of stories of a small variety of uncommon blood clots in recipients. Though it is unclear whether the vaccine was responsible for the clots, injections came to a sudden halt throughout the nation.

On Wednesday, a C.D.C. advisory panel suggested that it might be every week to 10 days earlier than they’d sufficient data to evaluate the vaccine’s dangers and will decide about its future.

The C.D.C. introduced Thursday that the panel would maintain one other emergency assembly on April 23.

Within the meantime, the officers — Dr. Fauci; Dr. Rochelle Walensky, the C.D.C. director; and Dr. David Kessler, who runs the Biden administration’s vaccine effort — urged People to proceed to get vaccinated.

“I hope we will all come collectively and ship that message,” particularly amid the unfold of worrisome variants, Dr. Kessler stated, including that the three federally licensed vaccines have “a wonderful security profile.”

Throughout a listening to that lasted greater than two hours, only one lawmaker — Consultant Mark Inexperienced, Republican of Tennessee, who’s a health care provider — requested in regards to the Johnson & Johnson vaccine. He urged the docs to watch out after they discuss in regards to the investigation, saying he nervous it might stoke fears that might discourage individuals from getting vaccinated.

No matter science was mentioned was overshadowed by partisan posturing and bickering. Republicans, recent off a visit to the nation’s southern border, used the session to assault the Biden administration’s dealing with of the immigration disaster; they waved pictures of migrants dwelling in crowded circumstances, whereas complaining about testing guidelines for these getting into the nation.

Democrats blasted the Trump administration and requested softball questions.

“Dr. Fauci, I really like you,” Consultant Maxine Waters, Democrat of California, whose sister died of Covid-19, stated at one level, after telling Dr. Fauci how a lot she relied on his counsel.

Dr. Fauci felt little love from Republicans, nonetheless. He and Consultant Jim Jordan, Republican of Ohio, reprised their heated conflict from the final time Dr. Fauci testified earlier than the panel in July 2020.

“You’re ranting once more,” Dr. Fauci stated at one level.

“I’m not ranting,” Mr. Jordan replied.

“Sure, you might be,” Dr. Fauci insisted.

With worrisome new variants of the virus spreading, Dr. Fauci and the others repeatedly described all three of the federally licensed vaccines — from Johnson & Johnson, Pfizer-BioNTech and Moderna — as extremely secure and efficient.

The stories of blood clots had been the second latest blow to the Johnson & Johnson vaccine. Earlier this month, an ingredient mix-up at a Baltimore manufacturing plant owned by Emergent BioSolutions ruined as much as 15 million doses of the vaccine. The F.D.A. is now inspecting the plant to see whether or not any vaccine doses manufactured there will be launched to the general public.

About 7.7 million People had received the Johnson & Johnson vaccine, accounting for lower than 4 % of the greater than 198 million doses administered throughout the nation. The Pfizer and Moderna vaccines are in a lot higher provide.

Officers observe that the blood clots are extraordinarily uncommon; the handful of instances signify lower than one in a single million recipients, though that incidence estimate may go up if extra instances are reported.

Biden administration officers say that the absence of the Johnson & Johnson vaccine may not have a significant affect on the U.S. vaccination marketing campaign. But when use of the vaccine is severely restricted worldwide, it could prove disastrous for the global vaccination effort.

Well being officers had hoped that the Johnson & Johnson vaccine, together with an analogous vaccine developed by AstraZeneca, would assist provide the world as a result of they’re cheaper and simpler to retailer and deal with than the Pfizer and Moderna vaccines.

However there have additionally been stories of uncommon blood clots in recipients of the AstraZeneca vaccine, main various nations to rethink its use. On Wednesday, Denmark, the place two recipients suffered extreme blood clots, completely suspended use of the AstraZeneca vaccine.