When would you use standard precautions over sterile precautions while taking care of your patient and why?

Please make an initial post by midweek, and respond to at least two other student's posts with substantial details that demonstrate an understanding of the concepts, and critical thinking. Remember that your posts must exhibit appropriate writing mechanics including using proper language, cordiality, and proper grammar and punctuation. If you refer to any outside sources or reference materials be sure to provide proper attribution and/or citation.