Keeping COVID-19 in check will likely require periodic boosters WUSTLmedschool nature
can elicit a broad antibody response capable of neutralizing a wide array of variants, including ones that have not yet emerged. The trick is to target a variant for the booster that is so different from the original strain of the virus that it triggers the maturation of new and diverse antibody-producing cells.
The first COVID-19 vaccines reduced the risk of severe illness and death by more than 90%. But then the virus changed. The antibodies that had worked so well against the original strain proved less effective at recognizing and neutralizing emerging variants, leading to breakthrough infections.
The first studies were discouraging, Ellebedy noted. The researchers looked at 39 people who had received the two-shot primary sequence of the Pfizer/BioNTech or Moderna COVID-19 vaccines, followed by an experimental booster shot targeting the beta and delta variants. All participants produced antibodies that neutralized the original virus strain and the beta and delta variants. But none of the antibodies studied were unique to beta or delta.
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