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The detection of coronavirus disease 2019 cases represents a significant challenge at the epidemiological level. Limitations exist in effectively detecting asymptomatic cases, achieving good follow-up in hospitals without the infrastructure for reverse transcription-quantitative PCR (RT-qPCR) or in difficult-to-access areas and developing methods with the need for less invasive sampling procedures. Therefore, the present study evaluated the performance of the direct reverse transcription loop-mediated isothermal amplification (RT-LAMP) test for detecting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in the saliva and nasal samples of asymptomatic individuals belonging to the university population. In addition, this test was also assessed for effectiveness in symptomatic individuals referred from a hospital with poor infrastructure in molecular biology and located outside the urban area. The RT-LAMP assay was compared with the results obtained from the RT-qPCR nasopharyngeal swab test, where the diagnosis was confirmed by lateral flow immunoassay test for rapid antigen detection. A total of 128 samples were analyzed, of which 43% were symptomatic positive individuals, 25% were asymptomatic positive individuals and 32% were SARS-CoV2-negative control individuals. Among positive individuals, no differences were found between the Cq values determined by RT-qPCR. A sensitivity of 96.5% and a specificity of 97.6% was reported for the detection of SARS-CoV-2 in symptomatic individuals by salivary and nasal RT-LAMP, as well as a sensitivity of 100% and a specificity of 97.6% for the detection of SARS-CoV-2 in asymptomatic individuals. These findings indicated that performance of the direct RT-LAMP test using saliva and nasal samples has high sensitivity and specificity, which in turn suggest that it is a viable and reliable alternative for use in epidemiological monitoring. [ABSTRACT FROM AUTHOR]

The development of depression and anxiety symptoms during long COVID may partly result from the biopsychosocial effects of COVID-19 that impact mental health, rather than from the infection alone. The present study examined the association of anxiety, depression, stress, and psychological distress levels with sociodemographic factors and symptom severity during and three months after the acute phase of COVID-19. This cross-sectional study included 119 participants with a positive SARS-CoV-2 qPCR test. Three months after the acute phase of infection, participants completed an online survey to collect clinical information and sociodemographic data, followed by completion of the Impact of Event Scale-Revised, Depression, Anxiety, and Stress scales. During and after infection, fatigue was the most frequently reported symptom. After the acute phase of COVID-19, substantial numbers of participants presented moderate to severe psychological distress (28.5%), severe to extremely severe depression (26.05%), and severe to extremely severe stress (31.09%). Female patients presented higher stress scores than males, while individuals who reported having lost a loved one presented high psychological distress, anxiety, and depression. The presence of physical symptoms after COVID-19 and other factors such as being a woman, being married, having children, or living with someone who suffers from a disease increased vulnerability to depression, stress, and anxiety. There are psychological consequences for survivors of COVID-19 associated with sociodemographic factors. Clinical strategies are needed to provide mental health care for individuals with long COVID symptoms. [ABSTRACT FROM AUTHOR]