Possible Clues:

• Outbreak
• Dim piece (anag.)
• Rash to dip me in ice stupidly
• Black Death of 14th century Europe, for one
• Even about half of what's in such a long poem one may get sick of
• Long account about death - third finally lost through plague
• Moore in poem with many victims at once
• With half a hundred bits of pie, there's a lot of it going
• With half a hundred bits of pie, you get it on 32 across
• Prevalent disease