symbiosis

sophisticated parasites have learned
to  lull their hosts' immune systems to sleep
so Crohn's just kills those who  have been dewormed
although some macro gut-flora comes cheap
and Raytheon could play a wholesome role
not lobby our Department of Defense
devouring all our nation's budget whole
for weapons systems that make no damned sense
too virulent a pest wipes out its host
and so expires itself for want of bread
when all its prey have given up the ghost
the pathogen is just as surely dead
cooperation gets forged in the fray
when those who played too rough get swept away