I was reading for some T’shuvos from R’ Ovadia today and I saw that in Yoreh Deah 1:8 he discusses the issue of Bittul Sakanah L’chatchilah. He is Meikil in the end.
And to explain to Jothar why this could be D’oraisa, he begins with a Machlokes Rishonim about whether Chavalah B’atzmo is D’oraisa or D’rabannan and then tries to figure out if that would apply to a Chavalah S’guli, not Tivi, as he calls it. (Derech Agav, he assumes in that T’shuvah that the rabid dog mentioned in the Gemara is only a S’guli issue and not Tivi; I wonder if anyone told him about rabies and if that could have changed his mind on that detail.)