I don't know , Through contact with blood of an infected person , Through contact with saliva of an infected person , Through contact with sweat of an infected person , Through contact with body fluid contaminated with blood of an infected person , 1 and 2 , 1 and 3 , 1 and 4 , 1, 2 and 3 , 1, 2, 3 and 4 , 2 and 3 , 2, 3 and 4 , 3 and 4 , 2 and 4 , 1, 3 and 4 , 1, 2 and 4 , 2 and 6