African journal of microbiology research (AFR J MICROBIOL RES)
Current impact factor: 0.54
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Publications in this journal
African journal of microbiology research 03/2015; DOI:10.5897/AJMR2015.7385
African journal of microbiology research 03/2015; 9(10):671-686.
Bacteria-parasite association has been documented as a factor that is responsible for continued and prolonged bacterial infection, such as typhoid and paratyphoid fever in schistosomiasis patients. This work aimed to determine the presence of typhoid and paratyphoid Salmonella among schistosomiasis patients and to evaluate the efficacy of Widal test on such population. A cross sectional descriptive study was conducted between November 2005 and May 2006 in Managil region, Gezira State, Sudan. A total of 203 males participated in the study. Urine, stool and blood samples were collected and processed for the investigation of schistosomiasis and Salmonella infection based on standard methods. Widal test was performed to estimate diagnostic cut-off value of enteric fever. Of the 203 studied subjects, 42 (20.7%) were diagnosed with Schistosoma haematobium, whereas eight (3.9%) had Schistosoma mansoni infection. Of these, Salmonella species were detected in 30 (60%) cases, of which Salmonella typhi represented 63.3%, followed by Salmonella paratyphi A and B (16.7%, each) and Salmonella paratyphi C (3.3%). Based on the culture results (n=30) as a diagnostic method used for enteric fever, Widal test was positive in 12 cases, with a sensitivity of 40% and specificity of 75%. Of the Widal positive cases, titers of 1:160, 1:320, 1:640 were detected in 58.3, 33.3 and 8.3% of samples, respectively. In schistosomiasis endemic regions, enteric fever was associated with schistosomiasis, which requires investigation of both infections concomitantly. Regardless of the low sensitivity of Widal test, titer of ≥1/160 is a diagnostic value for enteric fever in this study group.
African journal of microbiology research 02/2015; DOI:10.5897/AJMR2014.7210
Six Trichoderma strains (collected from IARI, New Delhi and MTCC, Chandigarh) were tested for their ability to inhibit soil born pathogen of groundnut mainly Sclerotium rolfsii (causing stem rot on groundnut). In vitro percent growth inhibition of S. rolfsii by various Trichoderma strain was recorded at 5 days after inoculation at 28 0C in the 90 cm petriplates. Results obtained from the antagonism study indicated that Trichoderma viride (NBAII Tv 23) inhibited 61% growth of phytopathogenic fungi S.rolfsii followed by T. harzianum (NBAII Th1) (55% growth inhibition of pathogen). The specific activities of cell wall degrading enzymes- chitinase, β-1, 3 glucanase, protease and cellulase were tested during different incubation period ( 48, 72 and 96 h) when Trichoderma spp. grew in presence of pathogen cell wall in synthetic media The antagonist Trichoderma viride (NBAII Tv 23) induced higher chitinase and protease activity. The growth inhibitions of pathogen during antagonism was positively correlated with coiling pattern of antagonists at14 DAI, and induction of chitinase, β-1, 3 glucanase and total phenol content. However, cellulase and poly galactouronase were found least amount in these antagonists treatment. A significant positive correlation (p = 0.01) between percentage growth inhibition of test fungus and lytic enzymes – (chitinase, β-1,3-glucanase and protease) in the culture medium of antagonist treatment established a relationship to inhibit growth of fungal pathogen by increasing the levels of these enzymes. Among the Trichoderma strains, T. viride was found best strain to be used in biological control of plant pathogen S.rolfsii.
African journal of microbiology research 02/2015; 9(6):365-372. DOI:10.5897/AJMR2014.7330
The bacterium causing cholera, Vibrio cholerae, is a marine organism and coastal waters are important
reservoirs of the organism. There are more than 200 serogroups of V. cholerae, of which serogroups O1
and O139 are known to be the causative agent of the cholera. The main virulent factor in V. cholerae is
cholera toxin gene (ctx) that is found from the epidemic O1 and O139 strains, but may also be found in
some strains other than O1 and O139 (non-O1 and non-O139). In this study, 48 V. cholerae strains
isolated from three estuaries of Tanzania and 20 stool isolates were characterized in terms of their
serogroups and possession of ctx gene and then compared using two PCR based fingerprinting
methods: Enterobacterial repetitive intergenic consensus (ERIC) sequences and repetitive extragenic
palindromic (REP) sequences. All the stool isolates and twelve of the environmental isolates belonged
to serogroup O1 while the remaining 36 environmental isolates were defined as non-O1/O139. The
entire stool isolates and 21 of the environmental isolates had the cholera toxin gene (ctxA). Both ERIC
and REP methods gave almost unique fingerprints for each strain and confirmed high genetic
heterogeneity among the different cholera strains. Higher similarity was observed in REP-PCR (70-
100%) than in ERIC-PCR (62-100%), indicating different discriminative power of these methods.
Environmental isolates clustered together with clinical isolates at ≥90% similarity level suggesting their
great potential of producing pathogenic strains that may be the causative agents for the frequent
observed cholera outbreaks particularly along the coast.
African journal of microbiology research 02/2015; 9(7):455-462. DOI:10.5897/AJMR2014.7307
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