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1.
Chinese Journal of Virology ; 36(6):997-1003, 2020.
Article in Chinese | GIM | ID: covidwho-2034152

ABSTRACT

To investigate the characteristics of the nucleic acids of severe acute respiratory syndrome coronavirus (SARS-CoV) -2 and antibodies in different specimens obtained from coronavirus disease 2019 (COVID-19) patients;if a correlation between these parameters and the disease course was present. The throat swabs and stool samples of 39 COVID-19 patients admitted to our hospital were collected in this study. Real-time reverse transcription-quantitative polymerase chain reaction (RT-PCR) was undertaken on throat swabs and stool samples. Peripheral blood was taken and serum levels of immunoglobulin IgM and IgG measured. Results showed That, Throat swabs and stool samples tested positive for the nucleic acid of SARS-CoV-Z, but nucleic acid levels were reduced significantly 15 days after disease onset compared with that upon diagnosis. The Ct value of the nucleic acid test was increased significantly. Serum levels of IgM and IgG were significantly higher than those of healthy people. nucleic acid loads in throat swabs and stool samples as well as serum levels of IgM and IgG were highly correlated with the disease course (r = 0.7387,0.5696, -0.546 and 0.6117,respectively, P < 0.05). In this study nucleic acid loads in throat swabs and stool samples as well as serum levels of IgM and IgG are highly correlated with the course of COVID-19.

2.
Wiener Tierarztliche Monatsschrift ; 109(Artikel 11), 2022.
Article in English | CAB Abstracts | ID: covidwho-2025202

ABSTRACT

We have evaluated the diagnostic performance of immunochromatographic point-of-care tests (POCT) for the detection of rotavirus, coronavirus, Escherichia (E.) coli F5, Cryptosporidium (C.) parvum, Clostridium (Cl.) perfringens and Giardia (G.) intestinalis in fresh and thawed faecal samples from calves aged up to six months with diarrhoea. We performed POCTs to detect rotavirus, coronavirus, E. coli F5, C. parvum, Cl. perfringens and G. intestinalis on fresh samples in a field study and re-evaluated the performance for C. parvum, Cl. perfringens and G. intestinalis using thawed samples. We calculated the performance based on the results of the reference methods, which were RT-qPCR for the detection of rota- and coronavirus and bacteriological culturing and PCR to detect E. coli F5 and Cl. perfringens a and ss2 toxins. C. parvum was detected by phase-contrast microscopy and G. intestinalis by immunofluorescence microscopy. We collected 177 faecal samples from diarrhoeic calves. We found good performance for the POCT targeting rotavirus (sensitivity (SE)=92.9%;specificity (SP)=95.6%) and C. parvum (SE=63.3%;SP=96.2%). For E. coli F5, the number of true positive samples (n=1) was too low to evaluate the performance. The POCT to detect coronavirus gave a poor performance (SE=3.3%;SP=96.6%) and the POCT to detect Cl. perfringens a moderate performance (SE=52.8%;SP=78.2%). G. intestinalis POCT showed a higher sensitivity to immunofluorescence microscopy in thawed than in fresh faecal samples (SE=43.9% versus SE=29.2%). There are substantial differences in diagnostic performance between the commercially available immunochromatographic POCTs. Still, POCT can make a valuable contribution to the diagnosis and prevention of calf diarrhoea.

3.
Wiener Tierarztliche Monatsschrift ; 109(Artikel 9), 2022.
Article in German | CAB Abstracts | ID: covidwho-2025201

ABSTRACT

Introduction: Neonatal calf diarrhoea is a multifactorial disease that sometimes leads to high economic losses. It can be fatal due to dehydration and acidosis and has been one of the main causes of calf mortality. Material and methods: This retrospective study considered calves of a maximum of 35 days of age and with a diagnosed infection with rotavirus and/or bovine coronavirus. We examined the clinical records of 156 calves that were referred to the University Clinic for Ruminants in Vienna. Results Calves that had been treated with antibiotics before admission to the Clinic had a higher risk of staying longer, suggesting either that these calves had a more serious illness or that antibiotic treatment was not indicated and so therapeutic success was not achieved. Twenty-three calves died or were euthanized at the Clinic. At the time of admission, they were younger than the surviving calves and they had a lower inner body temperature and a lower base excess at the first examination. The four most common pathogens in faecal samples were rotavirus, bovine coronavirus, Cryptosporidium parvum and Escherichia coli, which were detected in 67.1%, 53.9%, 48.1% and 94.1% of the faecal samples examined. The most common co-infection was rotavirus with Cryptosporidium parvum (17 faecal samples). We inspected the four most common pathogens in more detail. There were significant correlations between bovine coronavirus and season, with the risk of suffering from bovine coronavirus 1.6 times higher in winter than in other seasons. There was also a correlation between Cryptosporidium parvum and general behaviour: the risk of being infected with Cryptosporidium parvum was 2.6 times higher in calves that were moderately to severely depressed at the first examination. There was a correlation between co-infections and mortality, with calves with a co-infection at three times higher risk of dying than calves with a mono-infection.

4.
Journal of Southwest Minzu University Natural Science Edition ; 48(2):135-141, 2022.
Article in Chinese | CAB Abstracts | ID: covidwho-1958497

ABSTRACT

Feline Astrovirus (FAstV), Feline Parvovirus(FPV) and Feline Enteric Coronavirus (FECoV) are important pathogens causing diarrhea in cats.In order to establish a molecular detection method which can differentiate the three pathogens in the same PCR system, an FAstV/FPV/FECoV triple PCR method was established with optimized primer concentrations and annealing temperature, and specificity, sensitivity and repeatability were tested. The results showed that the PCR method could only identify FAstV (320 bp), FPV (468 bp) and FECoV (664 bp) genes, while not other canine and feline related pathogens. The detection limits of FAstV, FPV and FECoV were 2x10~7 copy/L (7.1 pg/L),4.7x10~6 copy/L (2.4 pg/L) and 7x10~6 copy/L (5.1 pg/L) respectively. The established triple PCR method was used to detect 207 cat fecal samples collected in Chengdu from 2019 to 2020, including 141 diarrhea samples and 66 clinical health samples. The detection rates of FAstV, FPV and FECoV were 24.15% (50/207), 37.20% (77/207) and 15.46% (32/207) respectively, and the co-infection rates of FAstV/FPV, FPV/FECoV and FAstv/FECoV were 9.18%,6.28% and 6.28% respectively. In conclusion, the triple PCR method of FAstV/FPV/FECoV was successfully established, and could be applied for virus detection and epidemiological investigation.

5.
Harran Universitesi Veteriner Fakultesi Dergisi ; 11(1):120-127, 2022.
Article in Turkish | CAB Abstracts | ID: covidwho-1934962

ABSTRACT

Bovine coronavirus (BCoV) infections are widespread in newborn calf diarrhea, which is one of the critical problems in cattle breeding. This study aims to investigate BCoV infection in calves with diarrhea in Sanliurfa province. In this study, 94 calves with diarrhea (3 months) following clinical examination were sampled. Enzyme-linked immunosorbent assay (ELISA) was used to detect the presence of BCoV antigen. A total of 5 stool samples were found to be BCoV positive (5.32%). This result showed that BCoV was low in calves with diarrhea in Sanliurfa province. However, considering the rapid spread of the infection in cattle populations, it is thought that it may cause significant economic losses due to treatment costs and calf deaths.

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