Biopanning of specific peptide for SARS-CoV-2 nucleocapsid protein and enzyme-linked immunosorbent assay-based antigen assay.

The ongoing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has rapidly spread worldwide which triggered serious public health issues. The search for rapid and accurate diagnosis, effective prevention, and treatment is urgent. The nucleocapsid protein (NP) of SARS-CoV-2 is one of the main structural proteins expressed and most abundant in the virus, and is considered a diagnostic marker for the accurate and sensitive detection of SARS-CoV-2. Herein, we report the screening of specific peptides from the pIII phage library that bind to SARS-CoV-2 NP. The phage monoclone expressing cyclic peptide N1 (peptide sequence, ACGTKPTKFC, with C&C bridged by disulfide bonding) specifically recognizes SARS-CoV-2 NP. Molecular docking studies reveal that the identified peptide is bound to the "pocket" region on the SARS-CoV-2 NP N-terminal domain mainly by forming a hydrogen bonding network and through hydrophobic interaction. Peptide N1 with the C-terminal linker was synthesized as the capture probe for SARS-CoV-2 NP in ELISA. The peptide-based ELISA was capable of assaying SARS-CoV-2 NP at concentrations as low as 61 pg/mL (∼1.2 pM). Furthermore, the as-proposed method could detect the SARS-CoV-2 virus at limits as low as 50 TCID50 (median tissue culture infective dose)/mL. This study demonstrates that selected peptides are powerful biomolecular tools for SARS-CoV-2 detection, providing a new and inexpensive method of rapidly screening infections as well as rapidly diagnosing coronavirus disease 2019 patients.

Professional identity and supporting willingness of nurses during the COVID-19 epidemic in China.

AIM: To investigate the professional identities and the willingness of nurses to respond to the call for support during the COVID-19 epidemic. BACKGROUND: The COVID-19 epidemic has resulted in nearly 300 million cases worldwide, causing more than five million deaths. However, the professional identities and the willingness of nurses to provide support during the COVID-19 epidemic in China remain unclear. METHODS: A total of 1,505 eligible nurses from 120 hospitals during the COVID-19 outbreak in China were included. Questionnaires were used to evaluate the willingness of these nurses to participate in epidemic control efforts. The Nurses' Professional Identity Scale was used to measure their sense of professional identity. RESULTS: About 90% of the nurses were willing to lend support in Hubei Province during the epidemic. The most common reason (93.84%) was found to be their beliefs as medical personnel in helping others in need. Nearly 10% of the nurses were unwilling to go to Hubei, primarily due to family reasons. The average total score of the Professional Identity Scale for all nurses reached a moderate to high level as indication of professional identity (116-125). Nurses who were willing to go to Hubei had a significantly higher total score than those who were not. CONCLUSIONS: The professional identity of nurses in China improved during the epidemic, and those with higher professional identities were more likely to respond to calls for support during the epidemic.

Decreased inhibition of exosomal miRNAs on SARS-CoV-2 replication underlies poor outcomes in elderly people and diabetic patients.

Elderly people and patients with comorbidities are at higher risk of COVID-19 infection, resulting in severe complications and high mortality. However, the underlying mechanisms are unclear. In this study, we investigate whether miRNAs in serum exosomes can exert antiviral functions and affect the response to COVID-19 in the elderly and people with diabetes. First, we identified four miRNAs (miR-7-5p, miR-24-3p, miR-145-5p and miR-223-3p) through high-throughput sequencing and quantitative real-time PCR analysis, that are remarkably decreased in the elderly and diabetic groups. We further demonstrated that these miRNAs, either in the exosome or in the free form, can directly inhibit S protein expression and SARS-CoV-2 replication. Serum exosomes from young people can inhibit SARS-CoV-2 replication and S protein expression, while the inhibitory effect is markedly decreased in the elderly and diabetic patients. Moreover, three out of the four circulating miRNAs are significantly increased in the serum of healthy volunteers after 8-weeks' continuous physical exercise. Serum exosomes isolated from these volunteers also showed stronger inhibitory effects on S protein expression and SARS-CoV-2 replication. Our study demonstrates for the first time that circulating exosomal miRNAs can directly inhibit SARS-CoV-2 replication and may provide a possible explanation for the difference in response to COVID-19 between young people and the elderly or people with comorbidities.

The Experience of Patients with COVID-19 in China: An Interpretative Phenomenological Analysis.

AIM: The present study examined the experiences of patients diagnosed with COVID-19 to better understand their concerns and inspiration and provide better care. METHODS: Semistructured interviews were performed with 10 COVID-19 patients from the Optical Valley Branch of Maternity and Child Healthcare Hospital of Hubei Province. Interviews were recorded on audiotape and transcribed verbatim. Transcripts were analysed using an interpretative phenomenological analysis. RESULTS: Four superordinate themes emerged: psychological distress caused by COVID-19 uncertainty, ethical dilemmas that will be faced after returning to the family and society, resources to cope with COVID-19, and event-related growth experience. CONCLUSION: Patients with COVID-19 were generally at high risk of having mental and social health challenges. Although the epidemic obviously affected their overall health, which led to their negative emotions or concerns, it also had a positive effect, such as viewing their relationship with families or others more positively and having more thoughts and outlooks on life. The study prompted medical staff to take their time listening to patients and pay more attention to specific psychological and social health problems in future care.

Psychological assistance during the coronavirus disease 2019 outbreak in China.

Disaster psychological assistance has become an important part of the disaster relief system, playing a crucial role in restoring and maintaining emotional stability and security of people and reducing trauma-related stress. As the first country to experience the outbreak of the coronavirus disease 2019 (COVID-19), China actively adopted psychological assistance measures in response to the panic caused by the epidemic. These measures are expected to help the Chinese government and governments in other parts of the world to better respond to the outbreaks of COVID-19.