"seroprotected" meaning in English

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  "lang_code": "en",
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          "text": "On day 21, a majority of subjects (66%) in the 30μg HA adjuvanted group (GMT = 34) were seroprotected.",
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        "simple past and past participle of seroprotect"
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          "text": "On day 21, a majority of subjects (66%) in the 30μg HA adjuvanted group (GMT = 34) were seroprotected.",
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