Lancet Infect Dis:志贺氏菌属SF2a-TT15疫苗I期临床研究获得成功

2020-11-11 MedSci原创 MedSci原创

SF2a-TT15疫苗耐受性良好,具有预防由志贺氏菌属感染导致的严重腹泻的潜力

志贺氏菌属感染是导致5岁以下儿童中、重度腹泻的重要致病因素。志贺氏菌属O特异性多糖(O-SP)是一个潜在的疫苗靶点。 近日研究人员考察了合成寡糖疫苗候选物SF2a-TT15的安全性、耐受性和免疫原性。
 
研究在特拉维夫Sourasky医疗中心开展,为人体剂量增加、单盲、随机、安慰剂对照研究。 64名18-45岁的健康成年志愿者参与,血清SF2A特异性IgG抗体滴度较低,每个队列32名参与者,随机接受2μg(队列1)和10μg SF2a-TT15疫苗 (队列2),总计三次肌肉注射,每次间隔28天。 主要结果是不良事件的发生率和严重程度,免疫原性终点是次要结果。
 
每个剂量组的32名参与者中,12人接受含佐剂疫苗注射,12人接受不含佐剂疫苗注射,8人接受安慰剂。 在两种剂量下,SF2a-TT15疫苗的耐受性良好,无严重不良事件发生。 1次或多次不良事件的发生率为88-100%,98%的不良事件为轻度。 7个中等程度的不良事件中,有1个(恶心)怀疑与疫苗候选者有关。接种疫苗后,无论是否含有佐剂,SF2a-TT15疫苗可诱导较高的血清抗SF2a脂多糖IgG抗体,几何平均滴度(GMTs)明显高于基线或安慰剂组。 1次注射后,与基线相比,10μg剂量非佐剂组诱导IgG抗体的GGMT增加27倍(5080 vs 189), 2μg非佐剂组增加5倍 (1411 vs 283)。第三次注射后2μg剂量含佐剂疫苗也可产生较强的特异性IgG反应(GMT 3200 vs 1176)。
 
研究认为,SF2a-TT15疫苗耐受性良好,具有预防由志贺氏菌属感染导致的严重腹泻的潜力。
 
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    2021-10-21 howi
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    2021-02-07 zhaojie88
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    2020-11-11 goodbing

    顶刊就是不一样,质量很高,内容精彩!学到很多

    0

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