Browsing by Author "Porteen, Kannan"
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ArticleItem Open Access Evaluation of recombinant outer membrane protein based vaccine against Salmonella Typhimurium in birds(2013) Prejit; Agarwal, Rajesh Kumar; Porteen, Kannan; Dubal, Zunjar B.; Asha, Karthikeyan; Shweta, Singh; Ripan, Biswas; TANUVASFood-borne diseases caused by Salmonella enterica from poultry sources represent an important public health problem and no reliable control by vaccination has proved effective despite research. The aim of the present study was to evaluate the use of recombinant OmpC protein for immunization of birds to elucidate its protection against virulent Salmonella Typhimurium. The recombinant OmpC protein was prepared after cloning and expressing ompC gene and was characterized by SDS-PAGE and Western blot analyses. The protein preparations were tested as vaccine candidate in layer birds by comparing the immune response, protection and organ clearance against crude lysate and control. The biologically functional recombinant 43 kDa truncated OmpC protein proved to be a good immunogen which induced a significantly high humoral immune response than control. At the same time, it primed a stable cellmediated immune response. A protective index (based on faecal shedding of organism) of rOmpC based preparations ranged between 50 and 75% as observed for 3 weeks after challenge. Therefore, the protein preparations conferred satisfactory protection against challenge infections with virulent strains of S. Typhimurium as evidenced by limited faecal shedding and minimal detection of Salmonella from edible tissues and eggs. These findings suggest the possibility to explore the use of S. enterica OMP protein for the production of novel vaccine.ArticleItem Open Access Goat milk as a non-invasive sample for confirmation of Mycobacterium avium subspecies paratuberculosis by IS900 PCR(2014) Sukumar, Bharathy; Gunaseelan, Lakshmanasami; Porteen, Kannan; Prabu, Karuppanasamy; TANUVASMycobacterium avium subsp. paratuberculosis (MAP) causes Johne's disease (JD) in cattle, sheep, goats and other ruminants, and Crohn’s disease in humans. MAPs are shed to external environment through feces and milk. The present study was aimed to evaluate the utility of milk as a non-invasive sample in stage II MAP infections in goats using IS900 polymerase chain reaction (PCR) and sequencing analysis. A total of 32 milk samples from lactating does were collected. Within these 32 milk samples, 15 were collected from pre-confirmed JD positive goats. By IS900 PCR, all the 15 (100%) known JD positive goat milk samples revealed the presence of MAP. However, no unknown goat was identified as MAP positive. The results of this study established the usefulness of milk as a non-invasive sample in screening and confirmation of stage II MAP infection in goats.ArticleItem Open Access Milk Ring Test for spot identification of Brucella abortus infection in single cow herds(2014) Mohamand, Najibullah; Gunaseelan, Lakshmanasami; Sukumar, Bharathy; Porteen, Kannan; TANUVASIn this study, milk samples were collected from 109 dairy cows to detect antibodies against Brucella (B.) using Milk Ring Test (MRT). Overall, 18.35% (n=20/109) of the milk samples were positive by MRT. The cows were divided into three groups based on lactation number viz., 1st, 2nd to 4th and ≥5th lactations; the prevalence of brucellosis in the groups were found to be 0.92% (n=1/109), 15.60% (n=17/109) and 1.83% (n=2/109), respectively. Considering simplicity and cost effectiveness, the MRT can be used for the preliminary screening of B. abortus infection especially in single cow herds.ArticleItem Open Access Occurrence of Methicillin Resistant Staphylococcus aureus from Bovine Raw Milk in Chennai(2020-02) Deepak, Shankaregowdanakoppalu Jagadeesh; Porteen, Kannan; Elango, Ayyasamy; Senthil Kumar, TMA, et al.; TANUVASStaphylococcus aureus and Methicillin-Resistant Staphylococcus aureus (MRSA) presence in milk is of significant importance as they are often involved in food borne intoxications. Effective surveillance and detection are the most important tools in outbreak investigation and control. Our study was designed to ascertain the occurrence Staphylococcus aureus and Methicillin-Resistant S. aureus (MRSA) from raw milk collected from apparently healthy cattle in Chennai city, Tamil Nadu, India. A total of 89 (89/258; 34.49%) positive isolates of Staphylococcus aureus obtained from 258 raw milk samples screened. Of which 24 (24/258; 9.3%) isolates positive for MRSA. Studying the antimicrobial resistance and its patterns in foods of animal origin will be of immense help to various regulatory agencies and authorities to devise and implement control measures and to note the compliance of our foods with the prescribed standards.