2009年,Legendre AM的实验小组对Sass and Sass生产的试验性药物“聚异戊烯免疫刺激剂”(英语:polyprenyl immunostimulant,简称PI)进行了实验,三只使用了PI的干性FIP患猫均生存了超过一年时间[34]。2017年,Legendre实验小组进行了60只干性FIP患猫范围的PI疗效实验,其中52只(87%)未能活过200天,但有4只(7%)生存了300天以上[35]。
另外,市面亦有辉瑞公司的PRIMUCELL鼻腔疫苗,但其预防效果具有争议。辉瑞公司在1991年取得该疫苗许可时进行的实验规模过小,且过于久远;其理论上起效条件也颇为苛刻,要求猫必须完全未曾接触猫冠状病毒,尽早断奶,此后彻底隔离,严格控制环境卫生,但这些措施仍无法完全保证猫不会患上FIP,因猫冠状病毒过于普遍。此外,该疫苗研发于20世纪70年代,彼时有关冠状病毒的研究和了解非常有限。美国猫科执业医师协会(英语:American Association of Feline Practitioners)以及欧洲猫科疾病顾问委员会(英语:European Advisory Board on Cat Diseases)均未建议使用该疫苗。
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