Panic Amongst the Herd

Scurry little insects, danger all-around
 Panicked seeking cover, like rats you spread, menacing the sound
 Wide-spread carnage trails you, delay and you will die
 The weaker links are victims, impeding the pace, on the stronger you'll rely
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 The whimper of the useless, over in a flash
 Desperate measures needed, time to strengthen ties, prejudices past
 
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 Bodies litter streets, carcass speed bumps, futile meat
 Just in the way, wailing panic, total doomsday
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 Primal fear of dying, priorities set straight
 To witness swath of death, terror you can't fake
 Infection of the fitest, spreads from dusk 'til dawn
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 Absolute chaos, a run for your money
 Assets expended, exercise in futility
 Only battle-tested, now seeking certainty
 Ripping through the ranks, of countless troops deployed
 Leviathan of legend here it stands upright, battle until destroyed
 Wave after wave depart, wiped out in the field
 This debacle must be countered and then surge, the remaining never yield