For cohort 1, sufficient subjects will be invited to participate in the study such that a maximum of 39 subjects will complete dosing. Subjects in cohort 1 will be randomised using a ratio of 2:1 to one of 2 treatment arms to receive either MEDI0382 or placebo. A maximum of 26 will complete dosing in the active arm and 13 will complete dosing in the placebo arm.