ETEST Gepotidacin (GEP) (0.016-256 µg/mL)

The ETEST Gepotidacin system uses an inert plastic strip with a built-in gradient of gepotidacin concentrations (ranging from 0.016 to 256 µg/mL). When applied to an inoculated agar surface, the antibiotic diffuses outward, creating a concentration gradient. Bacterial growth is inhibited where the antibiotic concentration exceeds the organism’s resistance threshold, forming an elliptical zone. The size and shape of this inhibition ellipse are measured to determine whether the isolate is susceptible or resistant to gepotidacin, following standardized interpretation criteria.

Yes, the ETEST Gepotidacin strip is intended for single-use only. This design choice ensures accuracy and reliability, as repeated use could compromise the integrity of the antibiotic gradient on the strip or introduce contamination. Single-use also aligns with best practices in microbiology testing to maintain consistency and prevent cross-contamination between samples.

The ETEST Gepotidacin system is designed for determining bacterial susceptibility to gepotidacin in general microbiology laboratory settings. While the primary focus is on common bacterial isolates, the submission notes that testing data for *Staphylococcus saprophyticus* resistance detection is limited. Clinicians should verify local guidelines or consult the manufacturer’s instructions for specific species or clinical scenarios.

The ETEST Gepotidacin system is classified as a Class II medical device under the FDA’s regulatory framework (product code JWY, category 866.1640). It holds both FDA 510(k) clearance (K260447) and IVDR compliance, with a determination of substantial equivalence to a predicate device. This classification reflects its role as a manual antimicrobial susceptibility test system, requiring premarket review to ensure safety and effectiveness.

While specific storage conditions are not detailed in the provided data, standard practices for antimicrobial susceptibility test strips—such as protecting them from moisture, extreme temperatures, and direct light—are recommended. The strips should be stored in a dry environment at room temperature (typically 2–25°C) until use. Always refer to the manufacturer’s instructions for precise storage guidelines to preserve the integrity of the antibiotic gradient.