How to prevent hantavirus pulmonary syndrome (hps )<br>Recognize signs of an infestation. Look for small pellets of rodent droppings about ¼-½ " (0.5-1.0 cm) in size. You may also see signs of gnawing on your furniture or rodent tracks in dusty spaces.
Rodents don't leave clues behind when they infest your house. 
( z1 leave-behind :polarity - :ARG0 ( z2 rodent ) :ARG1 ( z3 clue ) :time ( z4 invade :ARG0 z2 :ARG1 ( z5 house :poss ( z6 you ) ) ) )