IMSEAR Repository :: Browsing by Author "Singh, Mastan"

Browsing by Author "Singh, Mastan"

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Aetiology of childhood viral gastroenteritis in Lucknow, north India.
(2015-04) Gupta, Shilpi; Singh, K P; Jain, Amita; Srivastava, Shilpi; Kumar, Vishwajeet; Singh, Mastan
Background & objectives: Due to limited availability of data on viral aetiology of acute gastroenteritis in north India, the present study was planned to detect rotavirus, norovirus, sapovirus and astrovirus in stool samples of both in hospitalized and non-hospitalized children less than five years of age presenting with acute gastroenteritis. Methods: A total of 278 stool samples from equal number of children were tested for rotavirus antigen using ELISA and for norovirus, sapovirus and astroviruses by reverse transcription (RT)-PCR. Results: Of the 169 samples from hospitalized patients, rotavirus, norovirus, sapovirus and astrovirus were detected in 19.5, 2.3, 3.5 and 2.9 per cent samples, respectively. Of the 109 samples collected from the non-hospitalized patients, frequency of rotavirus and sapovirus detection was 9.1 and 1.8 per cent, respectively while norovirus and astrovirus were not detected. Interpretation & conclusions: Rotavirus was the most frequent cause of viral gastroenteritis in both hospitalized and non-hospitalized children. Maximum positivity of the viruses was seen in children less than two years of age.
Authors’ response.
(2015-11) Gupta, Shilpi; Singh, K P; Jain, Amita; Srivastava, Shilpi; Kumar, Vishwajeet; Singh, Mastan
Characterization of Acinetobacter from clinical isolates at Gandhi memorial and associated hospitals, Lucknow.
(2005-03-28) Banerjee, Gopa; Singh, Mastan; Goel, Nidhi
The study was conducted in 4140 clinical samples sent to Microbiology department from different department of G.M. and associated hospitals. The samples included 2270 urine, 960 pus, 300 blood, 210 sputum, 180 CSF, 20 intercostal drainage tubes and 150 other swabs like vaginal and urethral, conjunctival smear 30, 10 ascitic fluids and 10 gastric aspirates. Apart from this, 30 specimens were collected from hospitals environment, like linen and trolley. From clinical samples, 43 acinetobacter strains (1.04%) were isolated. 17 strains (0.41%), were from pus, 12 (0.28%), from respiratory tract, 1, was (0.02%) from intercostal drainage secretions, urine 9 (0.22%), blood 1 (0.2%) and CSF 3 (.72%). From environmental samples, 7 strains (23.33%) were isolated. All the isolated strains were identified by routine biochemical tests. They were preserved in 1 % agar media for characterization. Characterization was done on the basis of growth at 37 degrees c, 41 degrees c and 44 degrees c, hemolysis, gelatin hydrolysis, acid from glucose, utilization of citrate, L-phenyl alanine, malonate, B-alanine, L-arginine, L-ornithine and L-aspartate. Among species identified Acinetobacter baumannii was 30 (69.67%), from clinical specimens and 5 (71.42%) from environment, Acinetobacter lwoffi was 10 (23.25%) from clinical specimen and 2 from environmental specimen, Acinetobacter hemolyticus was 3 (6.97%) and none from the environment. All the strains were resistant to penicillin. The sensitivity pattern showed gentamycin 64% sensitive, cotrimaxazole 42% cefotoxin 32% ciprofloxacine 26% and tetracycline 16%.
Evaluation Of Hand Hygiene Training And Its Effect On Mdr Bacteria Detection In Various Intensive Care Units Of Eraâ€™S Lucknow Medical College
(Era's Lucknow Medical College and Hospital, 2017-01) Shukla, Priyanka; Haider, Fareya; Yaqoob, Shadma; Khare, Vineeta; Singh, Mastan
Hand hygiene is nowadays considered as one of the most important measures to prevent transmission and acquisition of HCAIs (health care associated infections). Monitoring hand hygiene compliance and providing healthcare workers with feedback regarding their performance are considered integral parts of a successful hand hygiene promotion programme. A total of 50 ICU staffs(resident doctors, faculty & nurses e.t.c.) were included in this interventional study. Baseline data of hand hygiene practices of all staffs and pre-intervention hand culture were obtained. Post intervention hand culture were taken after 30 days of training and interactive sessions as well as continous availability of ABHR in the ICU. Results of post-intervention hand culture showed a marked decrease in isolation of bacteria specially those of MRSAand ESBL. MRSAwas low by 35% and in non of the cases ESBL was reported. In all the ICUs frequency of hand hygiene was poor(average 31%) but improved significantly after intervention (70%).Introduction of ABHR was found to be an effective tool for improving hand hygiene. As a result of periodic training, monitoring, surveillance hand cultures and awareness generating campaign, transmission of resistant bacteria can be reduced, thus reducing the burden of nosocomial infection in a hospital set-up.
Identification, Characterization and Antibiotic Susceptibility Pattern of Non Fermenters from Clinical Specimens in Lucknow, Uttar Pradesh.
(2010-06) Srivastava, Ashutosh; Singh, Mastan; Singh, K P; Tripathi, Piyush; Kumar, Ram; Banerjee, Gopa
Present study was an attempt to study the prevalence of nonfermenter and its antibiotic susceptibility pattern at CSM Medical University, Lucknow. All the isolates and samples were selected from clinical specimens received in Bacteriology section, P.G. Depart of Microbiology, for culture. The observation were made on the nonfermenter isolates that can be isolated from clinical specimen using simple Laboratory media e.g. Blood Agar & Mac Conkey agar. All relevant history & information were recorded from the subjects. A total of 8340 specimen were screened for a period of one year. The prevalence of nonfermenters came to be 19.09% among all isolates. Most of spp. belongs to oxidase+ve group (77%). P. aeruginosa was found to be most common isolate (53%). Overall sensitivity profile for ciprofloxacin was 60%, P/T 58% & Amikacin 56%. Sensitivity of imepenem was 60% for multi-resistant isolates. The most resistant isolate was Sachrolytic Acinetobacter spp. The knowledge of synergism between drugs in context to different isolates may aid in effective therapy for these isolates.
In silico designing of siRNA targeting PB 1 gene of Influenza A virus and in vitro validation.
(2014-08) Jain, Bhawana; Jain, Amita; Prakash, Om; Singh, Ajay Kr; Dangi, Tanushree; Singh, Mastan; Singh, Kaleshwar P
Genomic variability makes Influenza A virus (IAV) ‘the least susceptible’ to existing vaccines or anti-influenza drugs. siRNA targeting viral gene silents the gene by cleaving mRNA. Present study aimed to develop siRNA targeting polymerase basic 1 (PB1) gene and to validate its efficiency in vitro. siRNA was designed rationally, targeting the most conserved region of PB1 gene of IAV strains. Total 147 strains worldwide and 42 Indian strains, when aligned, showed seven sets of conserved regions (> 30 bp stretch and < 5% mismatches). To choose the most efficient siRNA, three levels screening method was developed. Finally one pair of siRNA was chosen due to its unique position in conserved region. siRNA efficacy was confirmed in vitro on Madin Darby Canine Kidney (MDCK) cell line propagating two clinical isolates i.e. Influenza A/H3N2 [A/India/LKO864/ 2011(H3N2)] and Influenza A/pandemicH1N1 [A/India/LKO2151/2012(H1N1)]. The longest ORF was targeted by the selected siRNA, which showed 57 % inhibition in replication of Influenza A/pdmH1N1 and 60.6 % inhibition in replication of Influenza A/H3N2 at 72 hpi and 48 hpi respectively on MDCK cell line. This study shows that siRNA targeting PB1 may be moderately effective in controlling IAV replication so can be used as anti-IAV therapeutic agent.
In vitro validation of self designed “universal human Influenza A siRNA”.
(2015-08) Jain, Bhawana; Jain, Amita; Prakash, Om; Singh, Ajay Kr; Dangi, Tanushree; Singh, Mastan; Singh, KP
The genomic variability of Influenza A virus (IAV) makes it difficult for the existing vaccines or anti-influenza drugs to control. The siRNA targeting viral gene induces RNAi mechanism in the host and silent the gene by cleaving mRNA. In this study, we developed an universal siRNA and validated its efficiency in vitro. The siRNA was designed rationally, targeting the most conserved region (delineated with the help of multiple sequence alignment) of M gene of IAV strains. Three level screening method was adopted, and the most efficient one was selected on the basis of its unique position in the conserved region. The siRNA efficacy was confirmed in vitro with the Madin Darby Canine Kidney (MDCK) cell line for IAV propagation using two clinical isolates i.e., Influenza A/H3N2 and Influenza A/pdmH1N1. Of the total 168 strains worldwide and 33 strains from India, 97 bp long (position 137-233) conserved region was identified. The longest ORF of matrix gene was targeted by the selected siRNA, which showed 73.6% inhibition in replication of Influenza A/pdmH1N1 and 62.1% inhibition in replication of Influenza A/H3N2 at 48 h post infection on MDCK cell line. This study provides a basis for the development of siRNA which can be used as universal anti-IAV therapeutic agent.
Molecular characterization of the rotavirus enterotoxin NSP4 gene of strains causing diarrhoea in children aged 0-5 years in northern India.
(2015-11) Srivastava, Shilpi; Jain, Amita; Khan, Danish Nasar; Prakash, Shantanu; Singh, Mastan; Awasthi, Shally
Non structural protein 4 (NSP4) gene of Rotavirus encodes a multifunctional protein which has significant role in viral multiplication and pathogenesis of acute watery diarrhoea associated with rotaviral gastroenteritis. It is known as the first viral enterotoxin and mutations of the gene have been linked to altered pathogenesis. This study was planned to ascertain the genotypes and genetic variations of NSP4 gene in the rotavirus strains prevalent in this area. We collected consecutive diarrhoeal stools from equal no of children aged under five years hospitalized with diarrhoea in a period from January 2010 to June 2012 and tested them for rotavirus antigen by ELISA. NSP4 gene was amplified by RT-PCR and subsequently sequenced (Big-Dye terminator kit using 3130 ABI, Genetic analyzer) and genotyped by Rotavirus C software. Of the 260 samples, 58(22.3%) samples were positive by ELISA. We were able to amplify NSP4 gene by RTPCR from 45 strains of which 35 amplicons were selected for sequencing. Total 25(71.4%) strains belonged to genotype E1, 6 (17.1%) strains to genotype E2 and 4 (11.4%) matched with the genotype E6. Sequence analysis revealed changes in the nucleotides causing punctate mutations in the conserved regions, the Inter species variable domain (ISVD) and the enterotoxin region (amino acid 114-135). On evolutionary analysis of 33 strains amino acid at position 131 was found under positive selection.
Observations on Citrobacter species from a tertiary care health center with special reference to multi-drug resistance and presence of CTX-M gene.
(2014-07) Mohan, Sneha; Agarwal, Jyotsna; Srivastava, Richa; Singh, Mastan
Background: Citrobacter is an important nosocomial pathogen and its multidrug resistant (MDR) isolates are increasingly being reported across the globe. They are known to produce extended spectrum beta lactamase (ESBL) and harbor CTX-M gene. Objective: The aim was to isolate Citrobacter sp. from clinical specimens, analyze their MDR status and look for the presence of CTX-M gene. Materials and Methods: In this prospective study, Citrobacter isolates positive for ESBL on screening, were confirmed by combined disc method along with minimum inhibitory concentration (MIC) for cefotaxime. In selected cefotaxime resistant isolates, multiplex polymerase chain reaction was done for blaCTX-M gene. Results: Of 146 Citrobacter sp. isolated, most (73%) were from admitted patients and hospital stay of >72 h and prior antibiotic intake were the most common associated factors. Maximum isolates were from pus (41.1%). Citrobacter freundii was the commonest species (49%) followed by Citrobacter koseri (28%); 79 were ESBL producers. Seventy were cefotaxime resistant as shown by MIC. blaCTX-M gene was detected in 15/40 of these isolates, all belonged to CTX-M group 1. Conclusion: Overall incidence of Citrobacter in our setup is low, but they were mostly MDR, and ESBL production was high, which is a cause of concern. blaCTX-M gene detection is important because of its rapid transmission to other bacterial species.
Prevalence Of Tinea Capitis In A Tertiary Care Hospital,North India
(Era's Lucknow Medical College and Hospital, 2016-07) Shukla, Priyanka; Haider, Fareya; Yaqoob, Shadma; Khare, Vineeta; Singh, Mastan
Fungal infections are common in humans worldwide. Hot and humid weather conditions in the tropical countries like India make humans very susceptible to fungal infections. Tinea capitis (TC) is the superficial fungal infection of the scalp and hair. The true incidence of Tinea capitis is unknown. although infection can occur at any age.Tinea capitis is one of the most common infectious conditions in children worldwide.Atotal of 100 subjects were enrolled in study who were attending Dermatology Out Patient Department (OPD) in a tertiary care hospital.Hair sample was taken and culture was done on Sabouraud's Dextrose Agar(SDA).Species identification was done by slide culture.T.tonsurans was most common isolate.
Spotted fever rickettsiosis in Uttar Pradesh.
(2015-02) Singh, Mastan; Agarwal, Jyotsna; Tripathi, Chandra Dev Pati; Kanta, Chandra
A study on pre-XDR & XDR tuberculosis & their prevalent genotypes in clinical isolates of Mycobacterium tuberculosis in north India.
(2016-03) Singhal, Parul; Dixit, Pratima; Singh, Pooja; Jaiswal, Indu; Singh, Mastan; Jain, Amita
Background & objectives: Pre-extensively drug resistant (pre-XDR) and extensively drug resistant tuberculosis (XDR-TB) have been areas of growing concern, and are posing threat to global efforts of TB control. The present study was planned to study the presence of pre-XDR and XDR Mycobacterium tuberculosis and their genotypes in clinical isolates obtained from previously treated cases of pulmonary TB. Methods: A total of 219 isolates obtained from previously treated cases of pulmonary TB were subjected to first-line (streptomycin, isoniazid, rifampicin and ethambutol) and second-line (ofloxacin, kanamycin, capreomycin and amikacin) drug susceptibility testing on solid Lowenstein-Jensen medium by proportion method. Genotyping was done for pre-XDR and XDR-TB isolates using 12 loci Mycobacterial Interspersed Repetitive Units-Variable Number Tandem Repeats (MIRU-VNTR). Results: Multi-drug resistance was observed in 39.7 per cent (87/219) isolates. Pre-XDR and XDR M. tuberculosis isolates amongst 87 multi-drug resistant (MDR) TB isolates were 43 (49.4%) and 10 (11.4%), respectively. Two most dominant genotypes among pre-XDR and XDR M. tuberculosis isolates were Beijing and Delhi/CAS types. Interpretation & conclusions: Resistance to second-line anti-tubercular drugs should be routinely assessed in areas endemic for TB. Similar genotype patterns were seen in pre-XDR and XDR-TB isolates. Beijing and Delhi/CAS were predominant genotypes.
Trend of dengue virus infection at Lucknow, north India (2008- 2010): A hospital based study.
(2012-11) Pandey, Nidhi; Nagar, Rachna; Gupta, Shikha; Omprakash; Khan, Danish; Singh, Desh Deepak; Mishra, Gitika; Prakash, Shantanu; Singh, K P; Singh, Mastan; Jain, Amita
Background & objectives: Dengue virus (DV) infection has emerged as a major health problem in north India. Here, we report the annual trend of dengue virus infection as seen in Lucknow, Uttar Pradesh, during 2008-2010. Methods: Blood samples from clinically suspected cases of dengue virus infection were collected and history was taken on structured clinical data sheet. All samples were tested for dengue IgM by antibody capture ELISA. Selected samples were tested by conventional RT-PCR for dengue virus RNA. Weather information was continuously recorded from website of world weather information service. Results: There was a gradual increase in number of dengue fever cases with increased occurrence in 2010. Cases referred in January - December 2008 were 398 (54.5% anti DV IgM positive), in January - December 2009 were 599 (51.9% anti DV IgM positive) and in January - December 2010 were 1602 (64.9% anti DV IgM positive). Serotypes circulating in years 2008, 2009 and 2010 were DV-2 & DV-3, DV -1, 2 & 3 and DV-1 and DV-2 respectively. There is no statistical significant correlation between weather data and increasing dengue positive cases. Interpretation & conclusions: Increased cases of dengue fever were seen in 2010, which was not correlated with any change in environmental factors. A change in circulating serotypes was noted.

Browsing by Author "Singh, Mastan"

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