Scientists say they nonetheless don’t know whether or not vaccinated individuals can unfold the virus.

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The Facilities for Illness Management and Prevention on Thursday walked again contentious feedback made in a TV interview by its director, Dr. Rochelle P. Walensky, suggesting that individuals vaccinated in opposition to the coronavirus by no means develop into contaminated or transmit the virus to others.

The assertion referred to as into query the precautions that the company had urged vaccinated individuals to take simply final month, like sporting masks and gathering solely below restricted circumstances with unvaccinated individuals.

“Dr. Walensky spoke broadly throughout this interview,” an company spokesman instructed The New York Instances. “It’s attainable that some people who find themselves absolutely vaccinated may get Covid-19. The proof isn’t clear whether or not they can unfold the virus to others. We’re persevering with to judge the proof.”

The company was responding partly to criticism from scientists who famous that present analysis was removed from enough to assert that vaccinated individuals can not unfold the virus.

The info counsel that “it’s a lot more durable for vaccinated individuals to get contaminated, however don’t suppose for one second that they can’t get contaminated,” mentioned Paul Duprex, director of the Heart for Vaccine Analysis on the College of Pittsburgh.

In her tv interview, with Rachel Maddow on MSNBC, Dr. Walensky had referred to knowledge revealed by the C.D.C. displaying that one dose of the Moderna or Pfizer-BioNTech vaccine was 80 % efficient at stopping an infection, and two doses have been 90 % efficient.

That actually advised that transmission from vaccinated individuals may be unlikely, however Dr. Walensky’s feedback hinted that safety was full. “Our knowledge from the C.D.C. at this time means that vaccinated individuals don’t carry the virus, don’t get sick,” she mentioned. “And that it’s not simply within the medical trials, it’s additionally in real-world knowledge.”

Dr. Walensky went on to emphasise the significance of continuous to put on masks and keep precautions, even for vaccinated individuals. Nonetheless, the temporary remark was extensively interpreted as saying that the vaccines provided complete protection in opposition to an infection or transmission.

In a pandemic that often spawns scientific misunderstanding, consultants mentioned that they have been sympathetic to Dr. Walensky and her apparent need for People to proceed to take precautions.

“What we all know is the vaccines are very considerably efficient in opposition to an infection — there’s increasingly more knowledge on that — however nothing is one hundred pc,” mentioned John Moore, a virologist at Weill Cornell Medication in New York. “It is a vital public well being message that must be gotten proper.”

All the coronavirus vaccines are spectacularly profitable at stopping critical illness and loss of life from Covid-19, however how effectively they stop an infection has been much less clear.

Scientific trials of the vaccines have been designed solely to evaluate whether or not the vaccines stop critical sickness and loss of life. The analysis from the C.D.C. on Monday introduced the welcome conclusion that the vaccines have been additionally extraordinarily efficient at stopping an infection.

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