Role Of Bacteria In Pathogenesis Research Articles

Pancreatic duct fluid culture in patients with chronic pancreatitis undergoing operative intervention and its implications on post operative course

Background: The role of bacteria in pathogenesis of chronic pancreatitis is poorly understood. Our aim was to analyse pancreatic duct fluid culture in patients undergoing operative intervention for chronic pancreatitis and its implications in post operative outcomes.Methods: Among 35 patients, 17 underwent Freys, 13 underwent longitudinal pancreatico-jejunostomy, 5 underwent cystojejunostomy. Duct fluid culture was obtained intraoperatively and analysed and compared with preoperative parameters and post operative outcomes.Results: 20 patients had positive duct fluid culture. Most common pathogen isolated was Klebsiella (8 patients). The only preoperative parameter which showed significant association was fasting blood glucose level. Wound infections were seen in 11 of which 10 had positive duct culture, out of which 9 had the same organism of that in duct culture. Mean hospital stay was 9±1.07 and 10±1.13 days in patients without and with infectious complications respectively.Conclusions: Older concept of sterile PD fluid in patients with CP may no longer hold true. In our study upto 60% of patients showed positive PD culture. By starting appropriate antibiotic we can reduce the length of hospital stay in patients who have septic complications. However large centre studies may guide us further into the importance of this concept and the role of bacteria in the pathogenesis of CP.

The presence of mycobacterial antigens in sarcoidosis associated granulomas.

Background: Sarcoidosis is a multi-organ disorder with unknown etiology. The role of bacteria in pathogenesis of sarcoidosis is still controversial. This study analyses new aspects of Mycobacterium Tuberculosis (MTB) presence in sarcoidosis diseases. Objectives: To find MTB in paraffin embedded tissues of sarcoidosis patients, samples of 10 sarcoidosis, 12 confirmed pulmonary tuberculosis (PTB) and 5 controls associated with granulomatous tissues were analysed. Methods: The paraffin embedded tissue specimens of the selected patients from the pathology archive of a subspecialty pulmonary hospital in IRAN were evaluated by Real Time PCR for MTB DNA using IS6110. Immunohistochemistry (IHC) method using MTB purified protein derivative (PPD) antibody was used to detect mycobacterial antigens. Results: All sarcoidosis patients had negative MTB DNA results in Real time PCR analysis. This analysis resulted in 10 (83.3%) positive cases for TB patients. The IHC analysis for MTB anti-PPD antibody showed positive diffused cytoplasmic staining for all TB patients whereas this staining was positive for 3 sarcoidosis patients (30%). Conclusion: Amplification of the IS6110 DNA sequence that is the most common target used for MTB diagnosis is not sensitive method to detect MTB in sarcoidosis granuloma. However, tissue IHC for anti-PPD antibody shows higher performance to detect MTB in sarcoidal granulomas reveals a mycobacterial signature in sarcoidosis tissue with negative IS6110 assay. This finding supports Mycobacterium tuberculosis may have an etiologic role in sarcoidosis. (Sarcoidosis Vasc Diffuse Lung Dis 2017; 34: 236-241)