WordNet (r) 3.0 (2006):

pesthole
    n 1: a breeding ground for epidemic disease

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "pesthole":
   Augean stables, ambulatory plague, black death, black plague,
   bubonic plague, cellulocutaneous plague, defervescing plague, dump,
   epidemic, epiphytotic, epizootic, glandular plague,
   hemorrhagic plague, hole, hovel, larval plague, murrain, pandemia,
   pandemic, pest, pestilence, pigpen, pigsty, plague, plague spot,
   pneumonic plague, premonitory plague, rookery, scourge,
   septicemic plague, siderating plague, slum, stable, sty, tenement,
   the slums, tuberculosis, warren, white plague