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International Journal of Economics and Management ; 16(2):147-162, 2022.
Article in English | Scopus | ID: covidwho-2045280

ABSTRACT

The purposes of this paper are (i) to examine 3 driving factors affecting China A-shares market performance;namely systematic risk, idiosyncratic risk, and market sentiment, and (ii) to investigate the relationship between state-owned enterprise (SOE) & non-SOE and stock returns. In addition, the study also analyze normal condition and the impacts of Sino-US trade war and Covid-19 pandemic. This study employs monthly data which is divided into two parts namely (i) 2004-2020 period and (ii) 2018-2020 period. Multiple classic asset pricing models are employed to investigate the impacts of the 3 driving factors on stock returns. The results showed that these 3 driving factors exert significant influence on China A-shares in 2004-2020, However, the impact of market sentiment is weak during the period 2018-2020. Furthermore, market risks, firm size and B/M factor show great impacts on both SOE and non-SOE, profitability factor affecting non-SOE stock return is more important than investment which improves SOE stock return. This study proposes that investors and companies pay more attention to systematic risk and idiosyncratic risk, which potentially have greater impact on the stock market and to reduce unnecessary economic losses © International Journal of Economics and Management

2.
J Med Virol ; 94(9): 4170-4180, 2022 09.
Article in English | MEDLINE | ID: covidwho-1826058

ABSTRACT

We adopted the reverse-transcriptase-loop-mediated isothermal amplification (RT-LAMP) to detect severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2) in patient samples. Two primer sets for genes N and Orf1ab were designed to detect SARS-CoV-2, and one primer set was designed to detect the human gene Actin. We collected prospective 138 nasopharyngeal swabs, 70 oropharyngeal swabs, 69 salivae, and 68 mouth saline wash samples from patients suspected to have severe acute respiratory syndrome (SARS) caused by SARS-CoV-2 to test the RT-LAMP in comparison with the gold standard technique reverse-transcription quantitative polymerase chain reaction  (RT-qPCR). The accuracy of diagnosis using both primers, N5 and Orf9, was evaluated. Sensitivity and specificity for diagnosis were 96% (95% confidence interval [CI]: 87-99) and 85% (95% CI: 76-91) in 138 samples, respectively. Accurate diagnosis results were obtained only in nasopharyngeal swabs processed via extraction kit. Accurate and rapid diagnosis could aid coronavirus disease 2019 (COVID-19) pandemic management by identifying, isolating, and treating patients rapidly.


Subject(s)
COVID-19 , SARS-CoV-2 , Brazil , COVID-19/diagnosis , COVID-19 Testing , Clinical Laboratory Techniques/methods , Humans , Molecular Diagnostic Techniques/methods , Nucleic Acid Amplification Techniques/methods , Prospective Studies , RNA, Viral/genetics , SARS-CoV-2/genetics , Sensitivity and Specificity
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