Mycobacterium avium subsp. paratuberculosis (MAP) causes the disease of cattle, Johne's. The economic impact of this disease includes early culling of infected cattle, reduced milk yield, and weight loss of cattle sold for slaughter. There is a possible link between MAP and Crohn's disease, a human inflammatory bowel disease. MAP is also a potential human food borne pathogen because it survives current pasteurization treatments. We review the current knowledge of MAP, Johne's disease and Crohn's disease and note directions for future work with this organism including rapid and economical detection, effective management plans and preventative measures.

Current perspectives on Mycobacterium avium subsp. paratuberculosis, Johne's disease, and Crohn's disease: a review.

India possess huge livestock population, which is endangered by different endemic infectious diseases (bacterial, viral, protozoan and parasitic), which collectively causes significant economic losses to the landless poor farming community. Infectious diseases impose economic losses by causing morbidity, mortality, decreased production (milk, meat, wool etc.), decreased feed conversion ratio which results in reduced weight gain, decreased draught power and fertility. Furthermore, economic burden is also due to the cost of treatment, abortion, consequences on internal livestock movement, germplasm and international trade. In addition, some of the diseases are zoonotic and inflicts considerable impact on public health. Uncertain agrarian climate, unpredictable weather, drought, floods, migration of livestock, scarcity of fodders, and unhygienic zoo-sanitary and healthcare practices together resulted in endemicity of diseases ultimately leads to more incidence and prevalence of livestock and poultry diseases throughout the year. Synchronized monitoring and surveillance of disease throughout the country is a fundamental requirement for sustainable livestock production. With fairly developed telecommunication in India, following technologies like interactive voice response system, SMS through mobile/cell phones and toll-free landline phones (voice mail) are required for enhancing the effectiveness and efficiency of

/pdf/prevalence-diagnosis-management-and-control-of-important-8fis62wj0s.pdf

Prevalence, diagnosis, management and control of important diseases of ruminants with special reference to Indian scenario.

Genotype profiles of Mycobacterium avium subspecies paratuberculosis isolates recovered from animals, commercial milk, and human beings in North India.

In recent years, Mycobacterium avium subspecies paratuberculosis (MAP) has emerged as major animal pathogen with significant zoonotic concerns, worldwide. MAP infection is endemic in domestic and wild ruminant population in India. However, information on MAP infection in free ranging animal species and non human primates is limited. Present study aimed to estimate the status of MAP infection in free living Rhesus macaques suffering with multiple clinical conditions (coughing and loose stool). A total of 25 stool samples were collected from six colonies of Rhesus macaques from Mathura region (North India) and screened for the presence of MAP, using microscopic examination and IS900 PCR, directly from stool samples. PCR positive DNA samples were further genotyped using IS1311 PCR-restriction enzyme analysis. Of the 25 stool samples, 10 (40.0%) and 2 (8.0%) were positive for MAP using microscopic examination and direct IS900 PCR, respectively. IS900 PCR positive DNA samples were genotyped as 'Indian Bison type', which is a major MAP genotype infecting domestic and wild ruminant species and human beings in India. Prevalence of MAP in Rhesus macaques (Indian monkeys) was moderately high and confirmed interspecies sharing of MAP between domestic livestock and non-human primates. Presence of MAP in non-human primates, support the etiological role of MAP in inflammatory bowel disease patients. Indian monkeys may serve as model for understanding the role of non-human primates in sustenance, transmission and pathogenesis of MAP infection.

Molecular identification and characterization of Mycobacterium avium subspecies paratuberculosis in free living non-human primate (Rhesus macaques) from North India.

Background
Enzyme-linked immunosorbent assay (ELISA) is often used to test wildlife samples for Mycobacterium avium subsp. paratuberculosis (MAP) infection. However, commercially available kits are only validated for use with domestic ruminant species. A literature review was performed to document the current use of MAP serum ELISA in wild and semi-domestic ruminants. We then modified and evaluated a commercial ELISA kit (IDEXX Mycobacterium paratuberculosis Antibody Test Kit) for use with species for which it was not originally developed: elk (Cervus elaphus), bison (Bison bison) and caribou (Rangifer tarandus). We tested the affinity of different conjugates for immunoglobulin G (IgG) isolated from these species, performed checkerboard tests to determine the optimal dilutions of samples and conjugates, and established cut-off values using two different methods: a Receiver Operational Curve on a panel of known samples for elk, and an alternate method involving a panel of unknown serum samples for the three species.

https://link.springer.com/content/pdf/10.1186%2F1746-6148-9-5.pdf

The modification and evaluation of an ELISA test for the surveillance of Mycobacterium avium subsp. paratuberculosis infection in wild ruminants

Present pilot study is the first attempt in the country to estimate sero-prevalence of Bovine Johne's disease (BJD) by screening cattle and buffaloes representing large population belonging to farmer's and farm herds in the home tracts (Uttar Pradesh (UP) and Punjab) of Hariana cattle and Murrah buffaloes in North India. Indigenous and in-house plate ELISA kit (using protoplasmic antigen from native Mycobacterium avium subsp. paratuberculosis 'Bison type' strain of goat origin), originally developed for goats and sheep was standardized in bovines and used for screening. For this study, 33 villages of south and west UP were randomly selected and surveyed from 2001 to 2003. There were 7943 farmer's families having 38,251 livestock, including cattle, buffaloes, goats and sheep (per family 4.8% livestock). Numerically, buffaloes and cattle were 54.7% and 22.1%, respectively. Serum samples were collected from 726 animals (4.2% of 16, 981 livestock with 4375 farmer's families) located in 33 randomly surveyed villages. Serum samples (699), submitted to Epidemiology Department of Veterinary College (Punjab Agricultural University, Ludhiana), in the year 2004 by farmer's and organized farm herds (Buffaloes, 372, Cattle, 327), were screened by this ELISA kit. Soluble protoplasmic antigen was prepared from Map (S 5) 'Bison type' strain isolated from a terminally sick goat with Johne's disease. Of the total 1425 bovine (Buffaloes and cattle) serum samples screened using indigenous ELISA kit, sero-prevalence of Johne's disease was 29.0% (28.6% in buffalo and 29.8% in cattle) in Northern India. State-wise sero-prevalence was 31.9% and 23.3% in UP and Punjab, respectively. In UP, of the 601 randomly sampled buffaloes, sero-prevalence was 40.3% (16.6% in young and 40.9% adults) and 25.5% (10.5% in young and 26.3% adults) in south and west UP, respectively. Of the 125 cattle screened, sero-prevalence was 42.6% (nil in young and 44.4% adults) and 30.0% (nil in young and 30.6% adults) in south and west UP, respectively. Of the 699 serum samples screened from Ludhiana, Punjab, sero-prevalence of BJD was 23.0%. Sero-prevalence was 23.3% (12.1% in young and 24.4% in adults) and 26.9% (27.2% in young and 26.8% in adults) in buffaloes and cattle, respectively. High prevalence of BJD in buffaloes in native tract of Murrah breed, and Hariana breed of cattle correlated with poor per-animal productivity and BJD may be the major cause. Indigenous ELISA kit was rapid, economic and sensitive test for large-scale screening of buffaloes and cattle population against incurable BJD.

Sero-prevalence of bovine Johne's disease in buffaloes and cattle population of North India using indigenous ELISA kit based on native Mycobacterium avium subspecies paratuberculosis 'Bison type' genotype of goat origin.

Before converting to clinical shedders, sub-clinical carriers also shed Mycobacterium avium subsp paratuberculosis (MAP) in feces. Therefore, early diagnosis is crucial for the control of Johne's disease. Of the 21 kids (farmer's herds), 9 (42.8%) and 14 (66.7%) were found positive by blood PCR and microscopy, respectively. Out of 14 young goats (farm herds) screened, 8 (57.8%) and 4 (28.6%) were found positive by blood PCR and blood culture, respectively. Screening of farm kids (21) by ‘Indigenous ELISA kit’ (S/P ratio) revealed, 9.5, 47.6, 28.6, 0.0 and 14.3% kids as strong positive, positive, low positive, suspected and negatives reactors, respectively. Kids in ‘strong positive’ and in ‘positive and strong positive’ categories were labeled as ‘type I’ and ‘type II’ reactors (positives) for MAP infection. Proportional agreement (kappa score) between blood PCR and microscopy was substantial (71.0%) and was moderate (57.0%) between blood-PCR and ELISA (type I and type II reactors). The study reports high presence of MAP (septicemia) in kids and young goats from farmer's and farm herds. Blood-PCR was rapid, sensitive and specific for the diagnosis of sub-clinical Johne's disease.

Evaluation of 'blood PCR' with blood culture, ELISA and microscopic examination for the diagnosis of Mycobacterium avium subspecies paratuberculosis infection in goat kids.

Efficacy of IS900 blood PCR was evaluated for the presence of MAP infection. Serum, fecal, and blood samples of kids, young, and adult goats from farm and farmer's herds in Mathura district were also screened by ELISA, microscopy and culture. Of 111 goats (kids: 40, young: 14, adults: 57) screened, 77.5% were positive by blood PCR. Of 76 goats, 90.8% (kids: 87.5% and adults: 94.4%) were positive by PCR. From 21 kids and 14 young goats, 42.8 and 57.1% were positive. gDNA from goats was genotyped as MAP “Indian Bison type”. Of 21 fecal samples of kids examined by microscopy, 66.7% were positive. In ELISA, 9.5 and 57.1% kids were positives as “type I” and “type II” reactors, respectively. Screening 14 young goats by culture of blood clots, 28.6% were positive. Agreement was substantial between PCR and microscopy. It was fair and moderate when PCR and microscopy were compared with type I and type II reactors, respectively. Presence of MAP in non-clinical kids and young goats indicate early or subclinical infection. Blood PCR was rapid, sensitive, and specific assay for detection of MAP in any stage (early, subclinical, and clinical) and age (kids, young, and adult) of goats.

/pdf/diagnostic-application-of-is900-pcr-using-blood-as-a-source-1ulyfxbskf.pdf

Diagnostic Application of IS900 PCR Using Blood as a Source Sample for the Detection of Mycobacterium avium Subspecies Paratuberculosis in Early and Subclinical Cases of Caprine Paratuberculosis.

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Papers

Sero-prevalence of bovine Johne's disease in buffaloes and cattle population of North India using indigenous ELISA kit based on native Mycobacterium avium subspecies paratuberculosis 'Bison type' genotype of goat origin.

Evaluation of 'blood PCR' with blood culture, ELISA and microscopic examination for the diagnosis of Mycobacterium avium subspecies paratuberculosis infection in goat kids.

Diagnostic Application of IS900 PCR Using Blood as a Source Sample for the Detection of Mycobacterium avium Subspecies Paratuberculosis in Early and Subclinical Cases of Caprine Paratuberculosis.