{
  "id": 1516244,
  "title": "Booster vaccination strengthens existing defenses against newer COVID-19 variants",
  "url": "https://urgent.news/2026/08/17/booster-vaccination-strengthens-existing-defenses-against-newer-covid",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-08-17T16:20:03.000Z",
  "source": {
    "name": "Medical Xpress",
    "slug": "medical-xpress",
    "url": "https://medicalxpress.com/news/2026-08-booster-vaccination-defenses-covid-variants.html"
  },
  "original_language": "en",
  "account": null,
  "summary": "The SARS-CoV-2 genome is subject to constant mutations. Some of these mutations reduce the effectiveness of RNA-based vaccines, which consequently have to be adapted regularly. Until now, however, it was unclear how the immune system reacts to new virus variants. Are mainly pre-existing memory B cells reactivated, or are new naive B cells also activated on a larger scale? This question is…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}