ABSTRACT
The global pandemic of Coronavirus disease 2019 (COVID-19) is a disaster for human society. A convenient and reliable in vitro neutralization assay is very important for the development of neutralizing antibodies, vaccines and other inhibitors. In this study, G protein-deficient vesicular stomatitis virus (VSVdG) bearing full-length and truncated spike (S) protein of SARS-CoV-2 were evaluated. The virus packaging efficiency of VSV-SARS-CoV-2-Sdel18 (S with C-terminal 18 amino acid truncation) is much higher than VSV-SARS-CoV-2-S. A neutralization assay for antibody screening and serum neutralizing titer quantification was established based on VSV-SARS-CoV-2-Sdel18 pseudovirus and human angiotensin-converting enzyme 2 (ACE2) overexpressed BHK21 cell (BHK21-hACE2). The experimental results can be obtained by automatically counting EGFP positive cell number at 12 hours after infection, making the assay convenient and high-throughput. The serum neutralizing titer of COVID-19 convalescent patients measured by VSV-SARS-CoV-2-Sdel18 pseudovirus assay has a good correlation with live SARS-CoV-2 assay. Seven neutralizing monoclonal antibodies targeting receptor binding domain (RBD) of SARS-CoV-2-S were obtained. This efficient and reliable pseudovirus assay model could facilitate the development of new drugs and vaccines.
ABSTRACT
Objective:To observe the clinical effect of children's massage combined with traditional Chinese medicine hot compress in the treatment of children with night crying heart and spleen fever syndrome.Methods:From April 2017 to January 2019, 90 children with nocturnal crying heart and spleen fever syndrome in the Department of Pediatrics, Shijiazhuang Traditional Chinese Medicine Hospital, who met the selection criteria were divided into 2 groups according to random numbers, with 45 cases in each group. The control group was given oral calcium and vitamin D, and the observation group was given children's massage combined with traditional Chinese medicine hot compress treatment. Both groups were treated for 7 days. The scores of TCM syndromes were performed before and after treatment, and the improved SPIEGEL sleep scale was used to evaluate the sleep quality of the children, and to evaluate the efficacy of crying and TCM syndromes.Results:After treatment, the scores of the primary and secondary symptoms in the observation group were significantly lower than those in the control group ( t values were 44.449, 46.204, 56.476, respectively, all Ps<0.001); SPIEGEL sleep scale score (4.7 ± 0.9 vs. 8.3 ± 1.4, t=14.715) was significantly lower than that of the control group ( P<0.01). While the tongue coating and fingerprint abnormalities did not change significantly after treatment in both groups ( χ2 values were 0.403, 0.401, respectively, all Ps>0.05). The total effective rate of crying in the observation group was 91.1% (41/45) and that in the control group was 62.2% (28/45). The difference between the two groups was statistically significant ( χ2=10.497, P<0.01). The total effective rate of TCM syndromes in the observation group was 97.8% (44/45) and the control group was 48.9% (22/45). The difference between the two groups was statistically significant ( χ2=27.500, P<0.01). Conclusions:Pediatric massage therapy combined with traditional Chinese medicine hot pack can improve the TCM syndromes and symptoms of children with night crying heart and spleen fever syndrome, relieve sleep dysfunction, and improve clinical efficacy.
