Tanvir Ahmad

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The cytotoxin-associated gene A (cagA), and the vacuolating cytotoxin gene A (vacA) products are considered the most important pathogenic determinants of Helicobacter pylori, a gram-negative bacterium causing gastrointestinal disorders such as duodenal ulcers, gastritis and mucosa-associated lymphoid tissue disease. A higher prevalence of H. pylori has been(More)
High frequency of Helicobacter (H.) pylori infection has been reported in Pakistan mainly for dyspeptic patients, while the published data is inadequate regarding asymptomatic population. The non-invasive 13C urea breath test (UBT) was used to determine the frequency of H. pylori infection in 516 asymptomatic individuals and to find out its association with(More)
Bioavailability refers to that fraction of nutrients which is utilized by the body out of the total indigested amount. Various direct and indirect methods for the determination of bioavailability are available. We determined the bioavailability of iron from fortified wheat flour using both in vitro and in vivo methods. The bioavailability data will be used(More)
OBJECTIVE To compare the sensitivity, specificity and Positive Predictive Value (PPV) of histology, Campylobacter-Like Organism (CLO) test, culture and 13C-Urea Breath Test (UBT) for the diagnosis of Helicobacter pylori infection. DESIGN Descriptive study. PLACE AND DURATION OF STUDY District Headquarter Hospital, Rawalpindi, Military Hospital,(More)
This study was designed to find the prevalence of sub clinical mastitis in goats in Kohat (Pakistan). Based on Surf Field Mastitis Test and California Mastitis Test, it was observed that prevalence of mastitis were higher in goat having age 2-4 or more than 4 years and had completed 3 or more than 3 lactations. On the basis of milking technique, prevalence(More)
Only few epidemiological studies have examined the rate of active H. pylori infection in the symptomatic population in Pakistan. This retrospective study presents the laboratory data collected during the past 13 years (2002 to 2015) from 2315 symptomatic patients referred to the BreathMAT Lab, Nuclear Medicine, Oncology and Radiotherapy Institute, Islamabad(More)
CT demonstrated pancolitis, suggesting ischemia versus infection. Empiric intravenous ampicillin, ciprofloxacin, and metronidazole were initiated. An urgent colonoscopy limited to the sigmoid revealed a diffusely hyperemic mucosa with extensive subepithelial hemorrhage. Histology showed ulceration, acute inflammation, and submucosal hemorrhage. Cultures of(More)
BACKGROUND/AIMS 13C urea breath test (13C UBT) is used to detect Helicbacter (H.) pylori in gastric mucosa. There are controversial results regarding associations of 13C UBT values with histopathological grades. We designed this study to correlate 13C UBT values with different histopathological grades in our local setting. METHODOLOGY 13CO2/12CO2 ratio(More)
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