Audiology and hearing health professionals in developed and developing countries (2002), Lyn et al. (1998), and Swart et al. (1995), impacted cerumen is one of the most common ear diseases and causes of hearing loss, with prevalence rate between 7.4% and 63%. Additionally, otoscopy does not require a great deal of expertise beyond basic training and is useful to refer a child when the tympanic membrane cannot be visualized due to occlusion of the external auditory meatus by cerumen. Pure-tone audiometry screening, in which there is typically no attempt to find threshold, has been found to accurately assess hearing status in children six years and older, when trained health workers
Body substance isolation known as body substance isolation. In 1996, both practices were replaced by the latest approach known as standard precautions (health care). Nowadays and in isolation, practice of body substance isolation has just historical significance. Body substance isolation went further than universal precautions in isolating workers from pathogens, including substances now currently known to carry HIV. These pathogens fall into two broad categories, bloodborne (carried in the body fluids) and airborne. The practice of BSI was common in Pre-Hospital care and emergency medical services due to the often unknown nature of the patient and his/her disease or medical conditions. It was