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.
Rodent droppings are always easy to see with the naked eye. 
( z1 see :ARG1 ( z2 droppings :mod ( z3 rodent ) ) :ARG1-of ( z4 easy ) :time ( z5 always ) :instrument ( z6 eye :mod ( z7 naked ) ) )