NEB also released a supplementary protocol for processing saliva, buccal swabs, and nasopharyngeal samples. Adenoviruses have been detected in bat guano, urine, and oral and rectal swabs. These PCR-based tests require a sample of urine, urethral swabs, or cervical/vaginal swabs. Women had similar success in self-sampling using tampons, swabs, cytobrushes and lavage. Tests include blood tests, eyes, nose or throat swabs, stool sample tests, and chest x-rays. The United States Air Force monitored airborne contamination through nasal swabs of onsite personnel. Dentists sometimes use silver nitrate-infused swabs to heal oral ulcers. He was dispatched to Iraq, taking fingerprints and DNA swabs from company employees. A related area is the use of swabs for microbiological environmental monitoring. Nylon is lighter, while cotton swabs are heavier. Several countries have introduced legislation to ban plastic stemmed cotton swabs. Mouth swabs were taken for analysis. Oral swabs are taken if culture is required. By 1939, NIB expanded to sell pillowcases, sanitary swabs, and fiber door mats. The company currently charges $79 per kit, which contains cheek swabs.