Advanced Dental Admission Test (ADAT)

Which characteristic is associated with Staphylococcus epidermidis?

1. Catalase negative

2. Infects prosthetic and intravenous devices

3. Causes pneumonia in alcoholics

4. Prominent in allergic reactions

The correct answer is: Infects prosthetic and intravenous devices

Staphylococcus epidermidis is a coagulase-negative staphylococcus known for its role in human infections, particularly in relation to medical devices. This organism is a common skin flora and becomes pathogenic under certain circumstances, especially when it is able to form biofilms on prosthetic devices and catheters. These biofilms can protect the bacteria from both the immune response and antibiotic treatment, leading to persistent infections. The characteristic of Staphylococcus epidermidis making it particularly significant is its propensity to infect prosthetic implants and intravenous lines. These infections often occur in patients with compromised immune systems or those who have undergone surgical procedures involving foreign materials. Such infections can lead to more serious complications, showcasing the clinical relevance of this organism in healthcare settings. In contrast, the other options do not accurately describe characteristics associated with Staphylococcus epidermidis. For example, Staphylococcus epidermidis is catalase positive, which helps differentiate it from certain other bacteria. It does not typically cause pneumonia, particularly in alcoholics, as that would be more closely associated with other pathogens such as Streptococcus pneumoniae. Furthermore, it is not a primary player in allergic reactions, which involves other immune processes and different types of pathogens. This further emphasizes the correct answer's significance