Indian Journal of Animal Research

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Research Article

Indian Journal of Animal Research, volume 53 issue 7 (july 2019) : 944-948

Quantification of Mycobacterium avium subsp. paratuberculosis from the tissues of challenged mice using SYBR Green real time PCR assay for the assessment of vaccine efficacy

R.K. Chaitanya, Y. Krishnamohan Reddy, G. Dhinakar Raj, A. Thangavelu
1Department of Veterinary Microbiology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai-600 007, Tamil Nadu, India.
Cite article:- Chaitanya R.K., Reddy Krishnamohan Y., Raj Dhinakar G., Thangavelu A. (2018). Quantification of Mycobacterium avium subsp. paratuberculosis from the tissues of challenged mice using SYBR Green real time PCR assay for the assessment of vaccine efficacy. Indian Journal of Animal Research. 53(7): 944-948. doi: 10.18805/ijar.B-3611.

ABSTRACT

A SYBR Green real time PCR assay amplifying F57 gene of Mycobacterium avium subsp. paratuberculosis (MAP) was developed to evaluate the protective efficacy of the inactivated vaccine to prevent the colonization of MAP in the tissues of BALB/c mice challenge model. Bacterial burden in the liver, spleen and intestine of vaccinated and sham immunized control mice, after intra peritoneal challenge with MAP were quantified by real time PCR assay.  A 195 bp fragment of MAP F57 sequence was cloned into TA cloning vector and the resultant recombinant plasmid was used to generate a series of quantification standards with copy number ranging from 109 to 1 copy. This absolute quantification technique is rapid and able to detect as few as 10 MAP organisms per gram of tissue and the assay has the efficiency of 0.982.

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