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Savard C, Ariel O, Fredrickson R, Wang L, Broes A. Detection and genome characterization of bovine kobuvirus (BKV) in faecal samples from diarrhoeic calves in Quebec, Canada. Transbound Emerg Dis 2022; 69:1649-1655. [PMID: 33788413 PMCID: PMC8938984 DOI: 10.1111/tbed.14086] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/17/2021] [Accepted: 03/26/2021] [Indexed: 02/05/2023]
Abstract
Kobuviruses are known to infect the gastrointestinal tract of different animal species. Since its discovery in 2003, bovine kobuvirus (BKV) has been identified in faecal samples from diarrhoeic cattle in many countries, but only recently in North America. Although its possible role as an agent of calf diarrhoea remains to be determined, evidence is mounting. Our study reports for the first time the detection of BKV in faecal samples from diarrhoeic calves raised in Quebec, Canada. BKV was more commonly identified than eight known and common enteric calf pathogens. Further sequence analysis revealed that Canada BKV strain 1,043,507 was more closely correlated with the US BKV IL35164 strain than other BKV strains with complete genome. Continued surveillance and genomic characterization are needed to monitor BKV in the cattle around the world.
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Affiliation(s)
| | | | - Richard Fredrickson
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois, Urbana, IL, USA
| | - Leyi Wang
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois, Urbana, IL, USA
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Fesseha H, Mathewos M, Aliye S, Mekonnen E. Isolation and antibiogram of Escherichia coli O157: H7 from diarrhoeic calves in urban and peri-urban dairy farms of Hawassa town. Vet Med Sci 2021; 8:864-876. [PMID: 34910854 PMCID: PMC8959283 DOI: 10.1002/vms3.686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background Calf diarrhoea is the most serious issue in the livestock industry, resulting in significant financial losses. Methods A study was undertaken in 32 urban and peri‐urban dairy farms of Hawassa town to isolate E. coli from diarrhoeic calves, assess associated putative factors related to the occurrence, and the evaluate antibacterial susceptibility patterns of isolates. A convenience sampling technique was performed for the selection of these dairy farms and calf samples. A total of 68 faecal samples were collected directly from the rectum of diarrhoeic calves. The faecal samples were confirmed as E. coli O157: H7 positive using the latex agglutination test. Results In this study, 47(69.1%) samples were positive for E. coli, of which 22 (46.8%) were identified as E. coli O157:H7 strains based on their latex agglutination character. Factors such as frequency of calf house cleaning, type of supplement provided, and method of colostrum feeding were significantly correlated (p < 0.05) with calf diarrhoea, while the other risk factors had no significant association. Antibiogram of E. coli O157:H7 isolates showed that the isolates were highly sensitive to gentamycin, ceftriaxone, trimethoprim‐sulphamethoxazole, and ciprofloxacin and were found to be resistant to tetracycline, kanamycin and amoxicillin. Conclusion Our findings revealed that calf diarrhoea is still a major health problem of calves in the study area. Hence, improved calf and farm management practice, an ad libitum quantity of colostrum, and good farm hygienic practices should be ensured. This study also revealed that some antibiotic‐resistant E. coli O157:H7 isolates need to be further investigated for their public health implications.
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Affiliation(s)
- Haben Fesseha
- School of Veterinary Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Mesfin Mathewos
- School of Veterinary Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Saliman Aliye
- School of Veterinary Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
| | - Endale Mekonnen
- School of Veterinary Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia
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Renault V, Damiaans B, Humblet MF, Jiménez Ruiz S, García Bocanegra I, Brennan ML, Casal J, Petit E, Pieper L, Simoneit C, Tourette I, van Wuyckhuise L, Sarrazin S, Dewulf J, Saegerman C. Cattle farmers' perception of biosecurity measures and the main predictors of behaviour change: The first European-wide pilot study. Transbound Emerg Dis 2020; 68:3305-3319. [PMID: 33225630 DOI: 10.1111/tbed.13935] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 11/16/2020] [Accepted: 11/18/2020] [Indexed: 01/16/2023]
Abstract
The importance of biosecurity as a strategy to prevent and control infectious diseases has increased substantially over the last few decades. Several studies have reported a low implementation level of biosecurity measures (BSM), particularly in cattle farms. In addition, a recent study demonstrated that cattle farmers are well aware of the recommended BSM and recognize them as more effective (in terms of time and costs) than treatment for disease. Therefore, other factors must be considered when it comes to understanding the decision-making process followed by a farmer regarding the adoption of BSM. This study analysed the possible influence of five mental constructs described in the health belief model (HBM) on the adoption of BSM and assessed the possible association of these constructs with different demographic and socio-psychological factors. Through an online survey, 988 questionnaires were completed by cattle farmers originating from Belgium, France, Germany, Spain and the Netherlands. The study revealed that the actual implementation of the BSM seems to be significantly influenced by the farmers' perception of the measures' benefits and the perception of health responsibility. Both constructs are influenced by the farmers' personality in terms of risk aversion and biosecurity knowledge. It was also found that organic farmers had a significantly lower perception of the BSM benefits and of their responsibility towards animal, public and environmental health when compared with other types of farmer. Organic farmers in this study seemed less likely to implement biosecurity measures. To increase the adoption of BSM by cattle farmers, it is therefore important to emphasise the actual evidence-based benefits of the measures and to investigate further how to strengthen cattle farmers' sense of responsibility towards animal, public and environmental health.
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Affiliation(s)
- Véronique Renault
- Research Unit in Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULiege), Fundamental and Applied Research for Animal Health (FARAH) Centre, Faculty of Veterinary Medicine, University of Liege, Liege, Belgium
| | - Bert Damiaans
- Veterinary Epidemiology Unit, Department Reproduction, Obstetrics, and Herd Health, Faculty of Veterinary Medicine, Ghent University, Gent, Belgium
| | - Marie-France Humblet
- Department of Occupational Safety and Health, Biosafety and Biosecurity Unit, University of Liege, Liege, Belgium
| | - Saúl Jiménez Ruiz
- SaBio Group (Health and Biotechnology), Instituto de Investigación en Recursos Cinegéticos (IREC; CSIC-UCLM-JCCM), Ciudad Real, Spain.,Department of Animal Health, Faculty of Veterinary Medicine, University of Córdoba, Córdoba, Spain
| | - Ignacio García Bocanegra
- Department of Animal Health, Faculty of Veterinary Medicine, University of Córdoba, Córdoba, Spain
| | - Marnie L Brennan
- School of Veterinary Medicine and Science, University of Nottingham, Loughborough, UK
| | - Jordi Casal
- Department of Animal Health and Anatomy, Faculty of Veterinary Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Etienne Petit
- Groupements de Défense Sanitaire (GDS), Paris, France
| | - Laura Pieper
- Institute for Veterinary Epidemiology and Biostatistics, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Celine Simoneit
- Institute for Veterinary Epidemiology and Biostatistics, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | | | | | - Steven Sarrazin
- Veterinary Epidemiology Unit, Department Reproduction, Obstetrics, and Herd Health, Faculty of Veterinary Medicine, Ghent University, Gent, Belgium
| | - Jeroen Dewulf
- Veterinary Epidemiology Unit, Department Reproduction, Obstetrics, and Herd Health, Faculty of Veterinary Medicine, Ghent University, Gent, Belgium
| | - Claude Saegerman
- Research Unit in Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULiege), Fundamental and Applied Research for Animal Health (FARAH) Centre, Faculty of Veterinary Medicine, University of Liege, Liege, Belgium
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Wilms JN, Echeverry-Munera J, Engelking L, Leal LN, Martín-Tereso J. Tonicity of oral rehydration solutions affects water, mineral and acid-base balance in calves with naturally occurring diarrhoea. J Anim Physiol Anim Nutr (Berl) 2020; 104:1655-1670. [PMID: 32621377 PMCID: PMC7754374 DOI: 10.1111/jpn.13405] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/20/2020] [Accepted: 05/23/2020] [Indexed: 12/29/2022]
Abstract
Recommendations for composition of oral rehydration solutions (ORS) for calves, particularly concerning Na+, glucose, and their combined effect on tonicity, are not in line with guidelines for humans. Thus, this study aimed to determine the effect of ORS tonicity on water, mineral and acid–base balance. Seventy‐two calves were selected based on the severity of dehydration and blood base excess (BE) on day 0. Five calves that did not develop diarrhoea were removed post‐inclusion from the study. Calves were allocated to blocks of four animals based on blood BE on day 1. Within each block, calves were randomly assigned to one of four treatments: (a) hypotonic ORS with low Na+ and lactose (HYPO); (b) isotonic ORS with low Na+and glucose (ISO); (c) hypertonic ORS with high Na+ and glucose (HYPER); and (d) control consisting of warm water including 5 g/L of whey powder (CON). Treatments were administered twice daily over a 3‐day period, in which calves were offered 2.0 L of treatment at 1300 and 2100 hr. Calves were fed 2.5 L of milk replacer at 0700 and 1630 hr from day 1 to 3 and 3.0 L from day 4 to 5, and had access to water. Calves were monitored for 5 days in which measurements included intakes, BW, blood sampling and collection of faeces on day 1 and urine from day 1 to 3. All ORS treatments maintained normal serum Na+, whereas CON did not. Calves in the HYPER group had lower blood pH and greater faecal Na+ losses than HYPO and ISO. Plasma expansion relative to baseline was higher in low tonicity ORS (+4.8%) when compared with CON (+1.0%). Urine osmolality was 30% higher in HYPER calves. In this experiment, low tonicity ORS were more effective at restoring water, mineral and acid–base balance than the hypertonic ORS.
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Affiliation(s)
| | | | - Lauren Engelking
- Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, AB, Canada
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Lotfollahzadeh S, Madadgar O, Reza Mohebbi M, Reza Mokhber Dezfouli M, George Watson D. Bovine coronavirus in neonatal calf diarrhoea in Iran. Vet Med Sci 2020; 6:686-694. [PMID: 32349194 PMCID: PMC7267123 DOI: 10.1002/vms3.277] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 04/03/2020] [Accepted: 04/09/2020] [Indexed: 11/22/2022] Open
Abstract
Partial gene sequencing for the bovine coronavirus at the World Genebank is available for many countries, which are distributed unevenly in five continents, but so far, no sequencing of strains has been recorded in Iran. One hundred ninety‐four stool samples from calves with diarrhoea less than one‐month old were collected from five different geographical regions of country in order to detect coronavirus and characterize it if coronavirus was found. Samples were screened for the presence of BCoV by using a commercially available ELISA kit. Furthermore, RT‐PCR was carried out on positive samples for confirmation of the presence of N and S specific genes. Sequencing and phylogenetic analysis was carried out following RT‐PCR tests. 7.2% of samples, were positive for BCoV and all stool samples from the South‐West, Northeast and West regions of Iran were negative. The results showed that all the strains of coronavirus identified in Iran were completely in independent clusters and that they did not stand in the same cluster as any of the strains identified in other parts of the world. The strains from Iran were quite different from strains in other parts of the world but from the point of similarity these viruses showed some similarities to the European strains, such as those found in France, Croatia, Denmark and Sweden.
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Affiliation(s)
- Samad Lotfollahzadeh
- Department of Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Omid Madadgar
- Department of Microbiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.,Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, USA
| | - Mohammad Reza Mohebbi
- Department of Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | | | - David George Watson
- Strathclyde Institute of Pharmacy and Biomedical Science, University of Strathclyde, Glasgow, UK
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Smulski S, Turlewicz-Podbielska H, Wylandowska A, Włodarek J. Non-antibiotic Possibilities in Prevention and Treatment of Calf Diarrhoea. J Vet Res 2020; 64:119-126. [PMID: 32258808 PMCID: PMC7105995 DOI: 10.2478/jvetres-2020-0002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 01/13/2020] [Indexed: 01/21/2023] Open
Abstract
Due to increasing bacterial antibiotic resistance and the consumers' tendency to choose organic products, cattle farmers are interested in alternative methods of calf diarrhoea treatment. This is a major challenge for veterinarians. Few methods of non-antibiotic treatment that bring satisfactory results have been reported in the related literature so far. In this article, the authors compare different non-antibiotic methods of diarrhoea prevention and treatment in calves. Among the alternatives discussed are herbs, probiotics, prebiotics and synbiotics, lactoferrin, and bacteriophages. It was found that the best results could be achieved through the use of pro-, pre- and synbiotics. However, the authors would like to point out that with the expansion of knowledge about the practical use of broad-scale bacteriophages, they could be the best alternative to antibiotics.
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Affiliation(s)
| | - Hanna Turlewicz-Podbielska
- Department of Preclinical Sciences and Infectious Diseases, Faculty of Veterinary Medicine and Animal Sciences, Poznań University of Life Sciences, 60-637Poznań, Poland
| | - Agata Wylandowska
- Department of Preclinical Sciences and Infectious Diseases, Faculty of Veterinary Medicine and Animal Sciences, Poznań University of Life Sciences, 60-637Poznań, Poland
| | - Jan Włodarek
- Department of Preclinical Sciences and Infectious Diseases, Faculty of Veterinary Medicine and Animal Sciences, Poznań University of Life Sciences, 60-637Poznań, Poland
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Silverlås C, Bosaeus-Reineck H, Näslund K, Björkman C. Is there a need for improved Cryptosporidium diagnostics in Swedish calves? Int J Parasitol 2013; 43:155-61. [PMID: 23142404 PMCID: PMC7094644 DOI: 10.1016/j.ijpara.2012.10.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 08/21/2012] [Accepted: 10/05/2012] [Indexed: 11/29/2022]
Abstract
Cryptosporidium parvum is a common pathogen in preweaned calves but in Sweden Cryptosporidium bovis, which is considered apathogenic, is the most common species in this age group and it has been identified in diarrhoeal samples, indicating that it could be a cause of diarrhoea. In routine diagnostic procedures, infection is determined by microscopy, which is not sufficient to differentiate these species. We investigated whether routine Cryptosporidium diagnostic procedures need improvement to include species determination. The relation of Cryptosporidium spp. and subtype with the clinical picture and other pathogens was also investigated. A total of 782 diarrhoeal calf samples were analysed and Cryptosporidium infection was diagnosed in 198 samples. Cryptosporidium parvum was identified in 178, C. bovis in six and mixed C. bovis/C. parvum in seven samples. Twenty-seven C. parvum subtypes were identified, of which 16 were newly described. Except for three herds, only one subtype per herd was identified. Cryptosporidium parvum-positive calves were younger than C. bovis-positive calves and most C. parvum infections were seen at 1-3 weeks of age. Oocyst counts were higher in C. parvum samples. Yellow faecal colour was associated with C. parvum infection. Watery faeces had no greater association with C. parvum infection, but C. parvum subtype family IIa was more common than subtype family IId in watery faecal samples. No other pathogens were detected in the six C. bovis-infected calves, indicating a pathogenic potential. Our results show that species determination does not need to be included in routine Cryptosporidium diagnostic procedures in order to estimate the clinical relevance of infection in diarrhoeal calves. The maximum age when analysis for clinical cryptosporidiosis is performed can be lowered to 6 weeks of age. However, the indicated pathogenic potential of C. bovis warrants further attention.
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Affiliation(s)
- C Silverlås
- Department of Clinical Sciences, Division of Ruminant Medicine and Veterinary Epidemiology, Swedish University of Agricultural Sciences, P.O. Box 7054, SE-750 07 Uppsala, Sweden.
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Björkman C, Svensson C, Christensson B, de Verdier K. Cryptosporidium parvum and Giardia intestinalis in calf diarrhoea in Sweden. Acta Vet Scand 2003; 44:145-52. [PMID: 15074627 PMCID: PMC1831560 DOI: 10.1186/1751-0147-44-145] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2003] [Accepted: 08/25/2003] [Indexed: 11/17/2022] Open
Abstract
The objective of this study conducted in 75 herds was to investigate the presence and significance of Criptosporidium parvum and Giardia intestinalis in Swedish dairy calves in comparison with rotavirus, coronavirus and Escherichia coli K99+. The farmers were asked to collect faecal samples from each heifer calf that had diarrhoea between birth and 90 days of age, and also from a healthy calf of the same age. In total, 270 samples were collected and analysed. C. parvum, either alone or together with G. intestinalis and/or rotavirus, was detected in 16 (11%) and 6 (5%) of the samples from diarrhoeic and healthy calves, respectively. Even though a higher proportion of diarrhoeic calves shed C. parvum, the difference between the groups was not statistically significant (p = 0.067), possibly due to the low number of positive samples. G. intestinalis was found in 42 (29%) of the diarrhoea samples and in 29 (23%) of the samples from healthy calves. Rotavirus and coronavirus were demonstrated in 24% and 3% of the diarrhoea samples, respectively, whereas E. coli K99+ was only found in samples from 2 healthy calves. C. parvum and G. intestinalis were found in samples from calves 7 to 84 days of age and during all seasons. The results confirm that C. parvum is present in Swedish dairy herds and might have clinical significance. G. intestinalis was the most common agent found but the importance of this parasite remains unclear. Both parasites have suggested zoonotic potential and thus warrant further attention. In addition, rotavirus is a major pathogen in neonatal enteritis in Sweden, whereas coronavirus and E. coli K99+ seem to be of less importance.
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Affiliation(s)
- C Björkman
- Department of Ruminant Medicine and Veterinary Epidemiology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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Viring S, Olsson SO, Aleniús S, Emanuelsson U, Jacobsson SO, Larsson B, Linde N, Uggla A. Studies of enteric pathogens and gamma-globulin levels of neonatal calves in Sweden. Acta Vet Scand 1993; 34:271-9. [PMID: 7508678 PMCID: PMC8112519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/1993] [Accepted: 03/11/1993] [Indexed: 01/25/2023] Open
Abstract
Faecal and blood samples were taken from 10-30% of calves, 36 hours to 14 days old, in 47 dairy herds in different regions of Sweden from September 1987 to October 1988 (Olsson et al. 1993). Faecal samples from 279 calves were analysed for the presence of Escherichia coli (K99+), rotavirus and Cryptosporidium sp. Twenty (7.2%) of these samples were from diarrhoeic calves. An ELISA was developed and used for the rotavirus analysis. E. coli K99+ was detected in 11.5%, Cryptosporidium sp. in 6.1% and rotavirus in 5.4% of the faecal samples. The presence of rotavirus alone and the combination rotavirus and E. coli (K99+) was found to be associated with diarrhoea (p < 0.001 and p < 0.01 respectively). Blood samples from 327 calves were analysed for the level of total protein and gamma-globulin. In 43 of these samples (13%) gamma-globulin did not separate from the beta 2-region by electrophoresis. The mean total protein concentration was 53.6 g/l in calves free from diarrhoea. The mean gamma-globulin concentration, adjusted to 7 days age was 5.9 g/l. The 20 diarrhoeic calves had lower levels of both total protein and gamma-globulin, compared with calves without diarrhoea, but the difference was not significant. One litre more of colostrum at the first feed increased the level of total protein of the calves' sera by 1.4 g/l (p = 0.05). Calves born between May and September had a 2.0 g/l higher (p < 0.001) serum concentration of gamma-globulin than calves born between October and April.
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Affiliation(s)
- S Viring
- Animal Health Service, Swedish Meat Marketing Association, Uppsala
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Sukura A, Neuvonen E. Latex test for rapid rotavirus diagnosis in calves. Acta Vet Scand 1990; 31:1-4. [PMID: 2169187 PMCID: PMC8133291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A latex agglutination test (LA) was compared with direct electron microscopy (EM) for detection of rotavirus infection in calves. A total of 375 samples from 62 calves were collected. Samples were taken when the calves were 1, 3, 5, 7, 10 and 20 days old and some scours samples were collected as well. Altogether 45/375 (12%) specimens were positive in LA and 10/375 (2.7%) were positive in EM. Samples positive in EM were also positive in LA. Out of the 62 calves studied 26/62 (42%) were positive in LA and 8/62 (13%) in EM. We found the LA very easy to perform, to be more sensitive than the EM method and probably a rather specific method for detection of rotavirus infection.
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Affiliation(s)
- A Sukura
- Department of Anatomy and Embryology, College of Veterinary Medicine, National Veterinary Institute, Helsinki, Finland
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Sihvonen L, Miettinen P. Rotavirus and enterotoxigenic Escherichia coli infections of calves on a closed Finnish dairy farm. Acta Vet Scand 1985; 26:205-17. [PMID: 3904367 PMCID: PMC8202652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Rotavirus and enterotoxigenic Escherichia coli infections of calves were surveyed during 2 successive years on a closed Finnish dairy farm consisting of 90–105 milking cows. From a clinical standpoint, diarrhoea was of moderate to high severity during the first year, compared to the milder disease in the second year of the study. Diarrhoea or abnormal faeces were found only in calves less than 8 weeks old, with the peak occurring during the first 2 weeks of life. In the first year, rotavirus was detected throughout the calving season in diarrhoeic or abnormal faeces of calves aged 1 day to 7 weeks. In the second calving season, rotavirus was detected only during the 4 autumn months and in calves aged 11 days to 8 weeks. Rotavirus was detected in only 1 sample of normal faeces in both years. Electron microscopy revealed no enteropathogenic viruses other than rotaviruses. Enterotoxigenic K99 E. coli was found in about half of diarrhoeic or abnormal faeces in both years and throughout the calving seasons. K99 E. coli was also found in 5–10 % of normal faeces. In the second year of the study, 45 of 101 pregnant dams were vaccinated with 2 doses of E. coli antigen. The vaccination trial did not prevent or reduce altered faeces in calves whose dams had been vaccinated compared with calves whose dams had not been vaccinated in the same year. Comparing the 2 years, the earlier uptake of colostrum together with better cleaning and disinfection of the calf house, contributed to the later and rarer occurrence of rotavirus infection in the second year of the study. The earlier uptake of colostrum together with better cleaning and disinfection of the salf house, in the second year, could not prevent enterotoxigenic E. coli infections in calves but partly prevented and modified the disease.
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