and Sheridan Le Fanu's ' Carmilla' how could you go about outlining their literary contribution to English literature, in terms of vampire mythology?...

Concerning John Polidori's 'The Vampyre' and Sheridan Le Fanu's 'Carmilla' how could you go about outlining their literary contribution to English literature, in terms of vampire mythology? When doing so I need to discuss how they affect and were effected by society.