Fxperienced pest management professionals (PMPs) know that fecal matter or fecal stains, the "calling cards" after a bloodmeal, are a clear indication of a bed bug infestation. In fact, they are one of the telltale signs searched for when conducting abed bug inspection. For the most part, we recognize bed bug fecal stains as dark spots that may appear on a mattress, box spring, bed frame or other areas. But the porosity of the substrate upon which the fecal matter is deposited may affect the appearance of the fecal stain.
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