<i>Mycobacterium avium</i>Subspecies<i>paratuberculosis</i>and Bovine Leukemia Virus Seroprevalence and Associated Risk Factors in Commercial Dairy and Beef Cattle in Northern and Northeastern China

Sun, Wu-Wen; Lv, Wenfa; Cong, Wei; Meng, Qing-Feng; Wang, Chunfeng; Shan, Xiaofeng; Ai-dong, Qian

doi:10.1155/2015/315173

Cited by 20 publications

(18 citation statements)

References 23 publications

(25 reference statements)

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“…The seroprevalence investigation indicated that 66.7% (6/9) of herds and 14.2% of animals were positive for MAP antibodies, which is higher than the findings from previous studies from Shandong [18] and other provinces in China [41][42][43][44]. These studies recorded MAP antibodies in 2.8%-18% of animals [41][42][43][44]. However, we noted significant variation in the prevalence of MAP among the different farms, with percentages of seropositive samples ranging from 6.9% to 42.2%.…”

Section: Discussioncontrasting

confidence: 69%

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Characteristics and Epidemiological Investigation of Paratuberculosis in Dairy Cattle in Tai’an, China

Cheng

Liu

Wang

et al. 2020

BioMed Research International

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Paratuberculosis, a chronic and sometimes fatal disease of ruminants, is caused by Mycobacterium avium subsp. paratuberculosis (MAP). In this study, we examined paratuberculosis cases among 2–4-year-old dairy cows at farms in Shandong Province, China. Paratuberculosis cases were diagnosed based on clinical symptoms, pathological autopsy, and histopathological inspection. Characteristics of paratuberculosis in the affected dairy cattle included poor body condition, persistent diarrhea, subcutaneous edema, granulomatous ileitis (multibacillary), mesenteric lymphadenitis, and hepatitis. Acid-fast bacilli from fecal specimens and lymphocytes were putatively identified as MAP based on Ziehl-Neelsen staining, then confirmed using polymerase chain reaction-based testing and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analyses. Overall, only one MAP strain was isolated from a herd with symptomatic diarrhea. However, analysis of 586 serum samples from nine herds in Tai’an City revealed that 66.7% of herds and 14.2% of animals were seropositive for MAP. Our findings suggest that paratuberculosis is widely prevalent and therefore a significant threat to the dairy industry in Tai’an City, Shandong Province, China.

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Section: Discussioncontrasting

confidence: 69%

Section: Discussionmentioning

confidence: 75%

Characteristics and Epidemiological Investigation of Paratuberculosis in Dairy Cattle in Tai’an, China

Cheng

Liu

Wang

et al. 2020

BioMed Research International

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“…The variation of EBL seroprevalence among Brazilian states is due to the different environmental conditions, herd size, cattle management, and genetics, as well as the particularities of the diagnostic techniques employed [14,24,37]. This scenario is also repeated in different countries [32] such as Mongolia [26], Iraq [14], China [39], and Japan [15,27], which reported varied prevalences of 3.9%, 7.75%, 18.3%, and 66.8%, respectively.…”

Section: Discussionmentioning

confidence: 99%

Risk Factors for Enzootic Leukosis in Dairy Cattle from the Brazilian Amazon

Silva

Melchior

Reckziegel

et al. 2019

Acta Scientiae. Vet.

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Background: Enzootic bovine leukosis (EBL) is a viral and lymphoproliferative disease that attributes negative economic impacts to dairy farming. The immunosuppressive condition of these bovines favors the development of bacterial diseases such as tuberculosis, brucellosis, and bovine leptospirosis, which implications to the public health given that they are zoonosis. Diagnosis and control of EBL are neglected in cattle rearing, allowing their dissemination, especially in developing countries. In this sense, the objective of this study was to analyze the risk factors of EBL in dairy cattle from the Brazilian Amazon. Materials, Methods & Results:In order to identify the BLV-infected animals (527 serological samples), we used the agarose gel immunodiffusion serological test (IDGA) to diagnose the EBL and characterize the risk factors through the application of epidemiological questionnaires. We used the logistic regression test to evaluate the existence of a significant association between the variables. The EBL frequency in the study area was 14.42%. We detected seroreagent bovines in all municipalities evaluated with 95% of the properties showing outbreaks of the disease. The reuse of needles was the risk factor with the most significant statistical association (P < 0.01; OR = 2.16). Discussion: The origin of EBL in the Brazilian Amazon is probably related to the expansion of dairy cattle in the 1980s, which, at first, demanded the importation of cattle for the fast formation of the herds, without complying with the sanitary criteria of animal commercialization. The frequency of EBL in the Rio Branco microregion is below the estimated national average, as well as the regional level. The reduced influx of animals due to the geographical situation of Acre, since it is an area of greater physical isolation due to forest and river barriers, may influence the observed frequency. Different environmental conditions, herd size, cattle management, genetics and particularities of the diagnostic techniques should also be considered. The Rio Branco microregion can currently be considered as an area of medium frequency for BLV infection, a situation that ranges from 11 to 30% in the occurrence rate. When compared to herds with low infection frequency (<10%), the elimination of seroreagent animals and their respective outbreaks become more expensive in areas of medium or high frequency. As for the number of outbreaks detected, the finding reflects the degree of negligence regarding the prophylactic measures of EBL since it is a silent propagation disease, as well as the implications for the absence of official control and eradication programs in Brazil. According to the final logistic regression model, the reuse of needles for vaccinations, deworming, and for applying other drugs in different animals was the risk factor of greater association in the region, explaining the widespread occurrence of EBL in the studied farms. In Canadian herds, this practice also was associated with an increase in clinical cases. It is known that ...

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“…The prevalence of PTB has been reported from different countries, mainly for bovine PTB. Herd level prevalence of up to 75.8% was reported in the Caribbean and Latin America [13]; >50% in Europe and North America [14]; 20.35%-41.7% in Asia [15,16]. Animal level prevalence ranging from 2.31-29.8% was also reported in Asia [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Seroprevalence of Mycobacterium avium subsp. paratuberculosis in Dairy Cattle in Khartoum State, Sudan.

Elmagzoub

Adam

Idris

et al. 2020

Preprint

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Background: Paratuberculosis, caused by Mycobacterium avium subspecies paratuberculosis (MAP), is a chronic wasting disease of mainly domestic and wild ruminants (mammals). It occurs worldwide causing significant economic losses through decreased productivity, low fertility, increased cull rates and mortality. It is an OIE listed disease of concern to trade in animals. The aim of this study was to investigate the current prevalence of MAP infection in cattle in Khartoum State.Results: The overall apparent prevalence of MAP infection was found to be 6.3% and 18.9% (95% CL) at animal and herd levels, respectively. All seropositive animals were cross-bred females of good body condition; most of them (>90%) were >3 years old and >50% were from medium sized herds in Omdurman. No significant association (X2 >0.05) was found between seropositivity and animal herd data.Conclusion: The prevalence of MAP infection in Khartoum State is still low to medium compared to other parts of the world, but it is comparable to that reported from other African countries. Further studies with the view of designing wide national surveys in domestic ruminants and camels in other states of the country are needed for establishing control programmes.

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Mycobacterium aviumSubspeciesparatuberculosisand Bovine Leukemia Virus Seroprevalence and Associated Risk Factors in Commercial Dairy and Beef Cattle in Northern and Northeastern China

Cited by 20 publications

References 23 publications

Characteristics and Epidemiological Investigation of Paratuberculosis in Dairy Cattle in Tai’an, China

Characteristics and Epidemiological Investigation of Paratuberculosis in Dairy Cattle in Tai’an, China

Risk Factors for Enzootic Leukosis in Dairy Cattle from the Brazilian Amazon

Seroprevalence of Mycobacterium avium subsp. paratuberculosis in Dairy Cattle in Khartoum State, Sudan.

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