    Sentence 1: Why might rats not be responsible for  the plague?    Sentence 2: In addition to arguing that the rat  population was insufficient to account for a  bubonic. plague pandemic, sceptics of the  bubonic plague theory. point. out. that the  symptoms.of the Black Death are not unique (and  arguably in, some. accounts: may differ from  bubonic plague); that transference via fleas in  goods was likely to be of marginal significance;  and.that the DNA results may be flawed and might  not: have been repeated ‘elsewhere, “despite  extensive samples from other mass graves.