Premise: 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.
Hypothesis: Signs of gnawing on your furniture mean your house is rodent infested.