Background The novel coronavirus disease 2019 (COVID-19) was emergency turned into global public health after the first patients were detected in Wuhan, China, in December 2019. The disease rapidly expanded and led to an epidemic throughout China, followed by the rising number of cases worldwide. Given the high prevalence of COVID-19, rapid and accurate diagnostic methods are immediately needed to identify, isolate and treat the patients as soon as possible, decreasing mortality rates and the risk of public contamination by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2). Methods This case-control study was conducted in two hospitals in Alborz Province in Iran. All recruited cases in this study were symptomatic adults hospitalized as COVID-19 patients with compatible Computed tomographic (CT) scan findings and available rRT-PCR results. The patients were recruited in this study. The patients were categorized into positive and negative rRT-PCR groups and evaluated for symptoms, initial vital signs, comorbidity, clinical and laboratory findings. Finally, the results were assessed by SPSS software. Results Between March 5 to April 5, 2020, 164 symptomatic COVID-19 patients were studied. In total, there were 111 rRT-PCR positive (67.6%) and 53 rRT-PCR negative patients (32.4%). In terms of statistics, the frequency of symptoms revealed no difference, except for cough (P.V:0.008), dizziness (PV: 0.048), and weakness (P.V:0.022). Among initial vital signs, PR (P.V:0.041) and O2 Saturation (PV: 0.014) were statistically different between the two groups. Evaluation of comorbidities revealed no difference except for hyperlipidemia (P.V:0.024). In the comparison of laboratory findings, only WBC count (PV: 0.001), lymphocyte count (PV: 0.001), and Hb (P.V:0.008) were statistically different between the two groups. Conclusion In case of the negative rRT-PCR result, it is necessary to take a logical approach, and we recommended that the physician decides according to clinical manifestations, laboratory findings, and positive CT results.

Rising energy costs and environmental problems, also the limited resources of fossil fuels, have forced humans to use renewable energy. One of the systems that are commonly used is the cooling system, by means of solar energy. Since these models have a wide variety of effective variables, such as the temperature, latitude, the length of the day, also due to the nonlinear relationship between the variables, conventional modeling methods are inefficient. Therefore regarding to the extensive capabilities of simulation models in modeling a wide range of variables with complex and nonlinear relationship, in this study with the approach of simulating solar systems, an effective survey in the field of economic and efficiency of such systems, is presented.

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Background: Neurilemmomas also called schwannomas are benign tumors originating from the Schwann cells participating in the peripheral nerve sheath and the pathophysiology of the formation of these tumors is not completely understood. Schwannomas are mostly benign with equal incidence rate in men and women. These tumors have been mainly found in the head and neck, upper extremities, and the trunk. Lower extremity schwannomas are extremely rare, specifically in the dorsum of the foot. Case Report: In this report, we present an 18-year-old man referred to surgery clinic with a painful mass on the anterolateral dorsal aspect of his left ankle with radicular pain and paresthesia to the distal dorsum of the forefoot. After completing all the assessments including ultrasonography and magnetic resonance imaging (MRI), he underwent the surgical resection procedure. The pathology laboratory reported an encapsulated 35 * 20 * 15 mm solitary benign schwannoma. Conclusion: The dorsal aspect of the foot is an extremely rare site for schwannoma formation, but practitioners should always be aware of rare underlying diseases for neurologic deficits or just a simple pain in the lower extremities.

The novel coronavirus disease 2019 (COVID-19) has turned into a global public health emergency after the first patients were detected in Wuhan, China, in December 2019. Methods This case-control study was conducted in two hospitals of Alborz Province in Iran. All symptomatic adults hospitalized as COVID-19 patients with compatible CT scan findings and available RT-PCR results were recruited in this study. The patients were categorized in positive and negative RT-PCR groups and evaluated for symptoms, initial vital signs, comorbidity, clinical and laboratory findings and the results were assessed by SPSS software. Results Between March 5 to April 5, 2020, 164 symptomatic COVID-19 patients were studied. In total, there were 111 RT-PCR positive (67.6%) and 53 RT-PCR negative patients (32.4%). In terms of statistics, the frequency of symptoms revealed no difference, except for cough (P.V:0.008), dizziness (P.V: 0.048) and weakness (P.V:0.022). Among initial vital signs, PR (P.V:0.041) and O2 Saturation (P.V: 0.014) were statistically different between the two groups. Evaluation of comorbidities revealed no difference except for hyperlipidemia (P.V:0.024). In comparison of laboratory findings, only WBC count (P.V: 0.001), lymphocyte count (P.V: 0.001) and Hb (P.V:0.008) were statistically different between the two groups. Conclusion In case of negative RT-PCR result, it is necessary to take a logical approach, and we recommended that the physician decide according to clinical manifestations, laboratory findings, and positive CT result