Fluorophore-encapsulated nanobeads for on-site, rapid, and sensitive lateral flow assay.

Since December 2019, the rapid and sensitive detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has become a priority for public health. Although the lateral flow assay (LFA) sensor has emerged as a rapid and on-site SARS-CoV-2 detection technique, the conventional approach of using gold nanoparticles for the signaling probe had limitations in increasing the sensitivity of the sensor. Herein, our newly suggested methodology to improve the performance of the LFA system could amplify the sensor signal with a facile fabrication method by concentrating fluorescent organic molecules. A large Stokes shift fluorophore (single benzene) was encapsulated into polystyrene nanobeads to enhance the fluorescence intensity of the probe for LFA sensor, which was detected on the test line with a longpass filter under ultraviolet light irradiation. This approach provides comparatively high sensitivity with the limit of detection of 1 ng mL-1 for the SARS-CoV-2 spike protein and a fast detection process, which takes less than 20 min. Furthermore, our sensor showed higher performance than gold nanoparticle-based commercial rapid diagnostics test kits in clinical tests, proving that this approach is more suitable and reliable for the sensitive and rapid detection of viruses, bacteria, and other hazardous materials.

[Use of self-tests and rapid diagnostic tests: Survey of dispensing pharmacists in the Auvergne-Rhône-Alpes region]. / Utilisation des TROD et autotests : enquête auprès des pharmaciens officinaux de la région Auvergne­Rhône-Alpes.

OBJECTIVES: RDT and self-tests are sold in pharmacies. These are medical biology procedures that are currently reserved for biologists. Nevertheless, their use is now being reinforced by the COVID-19 pandemic. What role should the dispensing pharmacist have in relation to the patient? What role can the biologist have in this system? METHODS: A survey was carried out in pharmacies in the Auvergne-Rhône-Alpes region, as well as in Cameroon during the summer of 2020, to evaluate the use of RDT and self-tests. The answers obtained to the 10 questions were discussed after a simple statistical analysis. RESULTS: Two hundred and eighty-three pharmacies and 13 Cameroonian pharmacies participated in our survey. Pharmacists want to develop the use of RDT and self-test, but agree that training is necessary. Some tests are dispensed despite their unproven clinical usefulness. CONCLUSIONS: The delivery of TRODs and self-tests is acquired in pharmacies despite the reluctance of biologists. Pharmacists should be trained by biologists to use these tests in a relevant and appropriate manner.