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Practical colorimetric biosensors were developed for the detections of A29 and A27L proteins which were defined as Monkeypox virus (MPXV) and smallpox target proteins. For this purpose, gold nanoparticles (AuNPs) were synthesized and used to detect specific interaction between heparan sulphate (HS) receptor and A29 or A27L target proteins. This study is the first colorimetric biosensor that was based on the interaction of HS and A29 or A27L protein. In this work first, HS was labeled with AuNPs. When AuNPs labeled HS was incubated with A29 or A27L protein structure, these proteins specifically bounded to HS. Next, obtained AuNP/HS‐A29 or AuNP/HS‐A27L structures began to aggregate, and then difference in absorbance value of AuNP at 530 nm occurred. Absorbance differences at 530 nm were monitored spectroscopically. After experimental parameters were optimized, analytical characteristics of developed biosensors were investigated. As a result, the limit of detection was calculated as 7.93 ng.mL−1 and 6.09 ng.mL−1for A29 protein and A27L, respectively. The relative standard deviation were calculated as 1.97 % and 5.72 % for 25 ng.mL−1 A29 and 12.5 ng.mL−1 A27, respectively. Sample application studies were also performed with the standard addition of A29 and A27L proteins to real serum samples taken from healthy individuals. As a result, very promising results were obtained. [ABSTRACT FROM AUTHOR]

A 61-year-old woman presented to our clinic with complaints of decreased visual acuity, pain, and redness in her left eye. Best corrected visual acuity (BCVA) was 20/20 in the right eye and counting fingers at 3 meters in the left eye. On slit-lamp examination, 1+ cells were detected in the anterior chamber. Fundus examination revealed 1+ haze in the vitreous and multiple creamy-whitish lesions in the retina and vitreous. Her history included a diagnosis of coronavirus disease 2019 (COVID-19) one month earlier, for which she was hospitalized in the intensive care unit for 20 days and received systemic corticosteroid treatment. Vitreous culture yielded Candida albicans. The patient's nasopharyngeal swab sample was positive for COVID-19 by reverse transcription polymerase chain reaction test. BCVA was improved to 20/40 after amphotericin therapy (via intravitreal injection and intravenous routes), and the vitritis and chorioretinitis lesion regressed after 2 weeks of treatment. Two weeks later, intravenous amphotericin was discontinued and oral fluconazole treatment was started at a dose of 400 mg/day. At 3-month follow-up, her BCVA was 20/25 and no inflammatory reaction was observed in the anterior chamber and vitreous. [ABSTRACT FROM AUTHOR]

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