Clean Needle Technique (CNT) Written Practice Exam

People often carry Staphylococcus aureus without symptoms. About one in three individuals harbor it in the nasal passages or on the skin, which means many are asymptomatic carriers. This normal carriage matters because if the skin barrier is broken or the immune system is compromised, those carriers are at higher risk for developing skin and soft tissue infections such as boils, abscesses, or impetigo. Staphylococcus aureus is known for being a common skin pathogen when it becomes invasive, which is why this statistic is often highlighted in CNT study materials. Streptococcus pyogenes is a major cause of skin and throat infections but isn’t typically described as a common asymptomatic carrier in a large portion of the population. Staphylococcus epidermidis is a frequent skin resident and generally less virulent, mainly a concern with implanted devices or in immunocompromised patients. Pseudomonas aeruginosa is more of an opportunistic pathogen—common in hospital settings or in people with specific conditions—not a standard carrier in healthy people at that rate.