Urinary tract infection (UTI) is one of the most delicate health problem affecting women with severe complications and the rising antimicrobial resistance exerts a massive influence in treating UTIs. The objectives of this study was to identify the uropathogens causing UTI in non-pregnant women and their antibiotic resistance pattern. The study was undertaken in the outpatient department (OPD) of Obstetrics and Gynaecology, Capital Hospital, Bhubaneswar, Odisha during April 2015 to March 2016. A total of 766 midstream urine samples (MSU) was collected from women of different age. Out of 766 urine samples, 323 (42.1%) samples were culture positive for UTI with prominent bacteriuria. E.coli was found to be the most common isolate (54.79 %) followed by Staphylococcus sp. (22.6%), Enterobacter sp. (17.64%) and Klebsiella sp. (4.95%). Amongst various clinical symptoms, burning and itching during urination was found to be the most common (69.97%) symptoms followed by abnormal discharge of the vagina (45.20%) and the presence of cloudy urine (24.46%). E.coli the most predominant uropathogen identified was found to be highly susceptible towards a low level of resistance towards nitrofurantoin (11.8%) followed by amikacin (20.03%) and gentamicin (22.0%). Our study revealed that E. coli isolates were the predominant uropathogens and showed escalating model of resistance to the general available antimicrobial agents which are frequently used by the physicians in hospitals and private practice.
Urinary Tract Infections, Antibiotic resistance, Uropathogens, Bacteriuria, Anti Microbial agents
Urinary tract infection are the major public health concern caused by various bacterial species, such as most commonly by gram-negative Escherichia coli, gram-positive Bacilli Enterococcus faecalis, gram-negative Enterobacterales Proteus mirabilis, gram-negative facultative anaerobe Klebsiella pneumoniae and gram-positive Firmicutes Staphylococcus saprophyticus. High rates of recurrence with antimicrobial resistance among uropathogens continue to increase the economic burden of infections in population, considerably. Worldwide, there are 150 million cases per annum and in excess global economic costs for 6 billion US dollars.1
Infections in the urinary tract are a frequent cause of health care visits. UTIs are the least identified area of research as the primary cause of morbidity among infants, childrens, older men and females of all ages. Irrespective of such evidences, further researches had proven that prevalence of UTI is higher among the female.2 Linhares et al3 reported that at least once in a lifetime urinary tract infection is experienced by 50% of women3 and recurrent episodes have been observed between 20% and 40% of women4 whereas all UTIs reported in men were 20% approximately.5 Infectious diseases are one of the most common public health issues in developing countries like India.6 In clinical practice, urinary tract infection is known for its infectious nature of the diseases etiology.7 Symptoms showing for urinary infection are usually termed as bacteriuria,8 where lower and upper urinary tracts can be affected with UTI. Lower UTI infections termed as cystitis shows several symptoms which include dysuria, frequent urgency, and suprapubic tenderness. However, in most UTI cases upper UTI is often found with lower urinary tract symptoms.9 Pregnancy, sexual activities and unhygienic practices are primary causative factors for UTI which make females more prone to this disease.10 In non-pregnant women’s uterus is placed above the bladder, and in pregnant condition the enlargement of the uterus often affects the urinary tract.11 Bacteria involved in introducing complicated UTI are with broader species than those causing uncomplicated UTI,12 whereas non-complicated UTIs are results of infection primarily due to E. coli, associated with bacterial pathogens like Staphylococcus sp., Klebsiella sp. and Proteus mirabilis.13 Escherichia coli is responsible for community-acquired UTIs of about 80-85% whereas 5-10% by the Staphylococcus saprophyticus.14
Treatment for urinary tract infections is often started with antimicrobial therapy which is based on the information of antimicrobial resistance pattern displayed by the uropathogens.15 As a result, worldwide antimicrobial resistance is found to be more prevalent among urinary pathogens.16,14 Gaining knowledge of resistance pattern and collecting information regarding susceptibility, nature of urinary pathogens towards different antibiotics varies with their distribution in a different region. Thus, it is essential to have knowledge of the distribution of these pathogens and their susceptibility pattern towards different antibiotics in a particular location with proper setting.17
The research on resistance of uropathogens isolated from non-pregnant women having UTIs has not yet been reported in Odisha, India. Therefore, the current research was undertaken in view of the scarcity of reports of UTIs in non-pregnant women in the state of Odisha, India. The study reveals the most common causative microorganism responsible for UTI in non-pregnant women of different age groups, with its prevalence for UTI as well as the antimicrobial resistance pattern of uropathogens.
The cross-sectional study was conducted at the Department of Obstetrics and Gynaecology (O&G), Capital Hospital, Bhubaneswar, Odisha during April 2015 to March 2016.
The participants were recruited from women who attended the outpatient department of Obstetrics & Gynaecology with problems related to UTI. The study subjects enrolled were of non-pregnant women aged between 20-60 years. Participants reported with UTI symptoms i.e. itching and burning during urination, urge of frequent urination, urine with cloudy or blood were included in our study with proper consent towards participation. Women with pregnancy associated with reproductive tract malignancies who had been treated with antibiotics during the previous three weeks of their visit, and women who denied the consent towards participation had been excluded.
The work presented is a part of a large study entitled “Life course approach for exploring the impact of sanitation and menstrual hygiene management on psychosocial stress, behaviour, and health among girls, women, and neonates in Odisha (Orissa), India”. This cross-sectional study was designed by keeping 80% power at 5% level of significance. A total of 766 clinical patients reported to the OPD had been enrolled as study participants. The mid-stream urine sample were collected from patients suspected clinically for urinary tract infection. The clean catch sample was collected aseptically in a wide mouth sterile container followed by transportation to the microbiology laboratory for further analysis and processing within 15 minutes. Before analysis of urine samples, it was mixed properly by turning up and down gently and catalogue has been maintained for sample information with proper coding. Processing of urine sample and Identification of Urine culture: Urine culture was prepared on HiChrome UTI Agar (Himedia, India), 5% sheep blood agar & MacConkey agar.18 The culture plates were incubated at 37°C for 48hours under aerobic conditions. Culture plates having significant pure growth and colony count ≥ 105CFU/ml was considered as standard.19 The culture plates showing less than 105 CFU/ml colony count was repeated for further urine culture with complete history. Similarly lower colony counts with symptomatic cases were also kept in the study.20 Bacterial isolates were identified by Gram staining, motility testing and through various biochemical tests i.e. indole test, citrate test, oxidase test, catalase test, test for H2S production, assay of lysine decarboxylase, lactose fermentation test, hydrolysis of urea, test for gas generation, coagulase test, and mannitol test as per the standard protocol.21
Antimicrobial susceptibility test
Clinical isolates were subjected for antimicrobial challenges for their susceptibility and performed as per the modified Kirby Bauer`s disc diffusion method22 against standard antibiotics i.e. nitrofurantoin (300μg), ampicillin (10μg), co-trimoxazole (25 μg), ofloxacin (5 μg), gentamicin (10μg), amikacin (30 μg), nalidixic acid (30μg), cefuroxime (30μg), ciprofloxacin (10μg) & cefaclor (30μg). Suspension culture of bacteria was prepared in saline solution and turbidity was maintained and adjusted to match the standard 0.5 on McFarland scale.23 Mueller-Hinton agar plates were used for antimicrobial susceptibility testing and the uniform bacterial suspension was spread on MHA plates and discs of antibiotics were gently kept on the culture spread agar surface, at a minimum distance of 25mm from each other. Bacterial strains in spreaded plated were allowed to grow for 18-24 hours at 37°C, aerobically.24 The zones of inhibition around each disc were measured and compared with the zone diameter as per the standards of the clinical laboratory standards institute (CLSI) guidelines.25
Escherichia coli 10974 was obtained from Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (DSMZ), Germany. Enterococcus feacalis 51299, Klebsiella pneumonia 7500603, Staphylococcus aureus 25923 were collected from American Type Culture Collection (ATCC), USA. These cultures were used as controls for the interpretation of antibiotic sensitivity test (AST).
The results were analyzed statistically with IBM Statistical package for social sciences (SPSS) 20. The continuous variables (age distribution) had been presented as mean ± SD and categorical variables (clinical symptoms) as number (%). The Mann-Whitney U test was performed to compare between two age groups and Pearson’s chi-square test was used to compare the categorical variables.
The distribution of age in the patients in the sample was set within 20-65 years. A total of 766 urine samples collected were analyzed for UTI of women reported in OPD, out of which 323 (42.1%) samples were determined as culture-positive with significant bacteriuria. As per the age group distribution among participants, the calculated Mean±SD in UTI positive cases were found to be 33.06±9.40, whereas in UTI negative cases Mean±SD calculated were 35.79±12.14 (p<0.031) (Fig. 1).
*Values are mean± SD of three replicates
Fig. 1. Age distribution of Urinary Tract Infection women recruited at capital hospital (N=766).
In symptomatic women, various clinical symptoms were found such as burning and itching during urination with abnormal vaginal discharge, genital sores, and cloudy urine which were determined as 226 (69.97%), 146 (45.20%), 31 (9.60%), and 79 (24.46%), respectively. The symptoms of burning and itching during urination was the most frequently reported symptom (69.97%) followed by abnormal vaginal discharge (45.20%) and the presence of cloudy urine (24.46%). The difference was found to be statistically significant both in burning and itching during urination(p<0.001, χ2 test) and abnormal vaginal discharge (p<0.012, χ2 test) when compared to without UTI (Fig. 2).
A total of 323 bacterial uropathogens have been isolated as bacteriuria positive from urine samples. E. coli were observed to be the dominant bacterial species among all the isolated uropathogens with 54.79% rate of prevalence. The second most prevalent isolate found was Staphylococcus sp. with 22.6% followed by Enterococcus sp. with (17.64%), and Klebsiella sp. with the lowest prevalence rate of 4.95% (Fig. 3).
The pattern of antibiotic resistance showed the differential distribution of resistance and susceptibility towards antimicrobial agent for the uropathogens. Among all nalidixic acid showed the highest resistant 160 (90.39%) by E. coli and 48(65.75%) by Staphylococcus sp. The second most resistant antibiotic was Ampicillin (79.6%) in the case of E.coli followed by cefaclor (63.27%); however, the most sensitive drug against E.coli was observed to be nitrofurantoin with 21 (11.8%) followed by cefuroxime 33 (75.1%), amikacin 36 (20.03%) and gentamicin 39 (22.0%). Similarly, Staphylococcus sp. were sensitive against nitrofurantoin 8 (10.95%) followed by amikacin 11 (15.06%) and ofloxacin 13(17.80%). Nalidixic acid was shown to be the highest resistant with 16 (100.0%) followed by ampicillin 15 (93.75%), whereas nitrofurantoin and amikacin were found to be the most sensitive drug with 2 (12.5%) by Klebsiella sp.
Enterococcus sp. displayed resistance against nalidixic acid and ampicillin with 55 (96.49%) & 36 (63.15%) respectively, whereas nitrofurantoin and gentamicin were found to be a sensitive drug with 9(15.78%) (Table 1).
Antimicrobial Resistance Pattern.
|Antimicrobial Resistance Pattern of Uropathogens [n=323]|
Table showing patterns of antimicrobial resistance patterns by uropathogens, R% -Resistance rate, (Percentages represent resistant isolates/total number of isolates tested).
Due to the scarcity of reports of UTIs in non-pregnant women in the state of Odisha, India. The present investigation provides information to determine the prevalence of UTI in non-pregnant women and their antimicrobial resistant pattern. The present investigation illustrates the important data towards evaluation of antimicrobial resistance status with predominant uropathogens to deliver efficient treatment in the healthcare sector. Globally, a variety of bacterial pathogens are known to cause UTI which includes E.coli, Klebsiella, Enterobacter, Proteus, Pseudomonas, Staphylococcus, Streptococcus and Enterococcus.26,27 The present study reveals that prevalence of UTI in non-pregnant women was found to be 42.1% and the rate of prevalence was observed to be higher in our study when compared with studies conducted in Jaipur (17.19%) and in Aligarh (10.86%), India.28,29 whereas similar study with Mexican population showed higher rate of prevalence in uropathogens (97.3%).30 In a ten year surveillance study conducted during 2000 to 2009 at Aveiro district of Portugal, the incidence of UTI (78.5%) had been reported for elderly women, where more than half of the population had been infected with E. coli.3 The variation in rate of prevalence in UTI by causative uropathogens may be due to different geographical locations. This variation may also be influenced by certain local factors such as population density, social hygiene and practices. Similarly, the proximity of urethral meatus to anus, intercourse and short urethral feature has also been reported for higher degree of prevalence of UTI in females.31
In this study, it was observed that symptoms like Itching/ burning was significantly higher (69.97%) during urinating followed by vaginal discharge and cloudy urine. However, the data were extrapolated from self-reported symptoms, used for cross-sectional study, where the most common symptoms described was abnormal vaginal discharge with itching sensation of the genitalia.32
Globally E.coli has been demonstrated as the most potential bacterial pathogen found in UTI. In our study, out of four pathogens, E.coli amongst the gram-negative bacilli with 54.79% was the predominant bacterial pathogen responsible for the development of urinary tract infection. This result correlates with other studies in Uganda where E.coli was isolated with 57%23 and in Africa, the infection was in between 40-46%.33 A similar work carried out for evaluation of predominant uropathogens by Costa et al,34 reported E. coli (76.8%) as most frequent followed by Klebsiella sp. (11.3%), Enterococcus sp. (6.2%), and Proteus mirabilis (4.6%) in an ambulatory service during 2011 to 2014 towards empirical treatment with fist line recommended drugs by European Association of Urology (EAU).34 Similarly, Staphylococcus sp. amongst the gram-positive bacilli was the second most dominant organism, accounting for 22.6% of isolates. Our results also correlate for Staphylococcus sp., where it has been reported as the second most abundant organism causing UTI.35,36 The pathogenesis of Staphylococcus sp. in uncomplicated UTIs had been reported as diagnostic guidelines by EAU (2014) with 5-10% abundance in aetiolocal spectrum after E. coli (70-95%).37 The other isolates in this study included Enterococcus sp.(17.64%) and Klebsiella sp. (4.95%). It was similar to the previous studies in Uganda at Mulago Hospital by Mwaka et al who had isolated the Enterococcus sp. and Klebsiella sp. with 15% and 5% rate of infection, respectively.23
In this research, predominant bacterial pathogen E.coli have shown a high level of resistance towards commonly used β-lactams antibiotics (i.e. ampicillin and cefaclor), fluoroquinolones (i.e. ciprofloxacin and ofloxacin) co-trimoxazole, nalidixic acid and cefuroxime. A similar study conducted at six European countries including Russia for antimicrobial resistance had been reported for highest rate of resistance shown by E. coli against ampicillin (39.6%), followed by trimethoprim (23.8%), ciprofloxacin (15%), where nitrofurantoin and fosfomycin were found to be most active drug with low resistance (1.2% and 1.3%), respectively.38 It showed the similar pattern of resistance previously reported in a community-based study in India.39 It may be due to the frequent misuse of antimicrobial agents in administration and disposal, which is responsible for the emergence of resistant in these strains. Thus, the finding narrates for the appropriate mode of treatment with these antibiotics by the clinicians and physicians.
The drugs like Aminoglycosides (i.e. gentamicin with 22.0% and amikacin with 20.03%) when treated to the culture of E. coli showed low rate of resistance, with better sensitivity rates. Similarly, these uropathogens showed a high rate of sensitivity towards different antimicrobial agents where nitrofurantoin is the single most efficient antibiotic amongst other commonly been used in Capital Hospital against all isolated uropathogens, with a lower rate of resistant as low as 11.8% against E. coli. This result compares well with earlier studies conducted in different parts of India.29,40 Thus, in treatment of uncomplicated urinary tract infection, nitrofurantoin could be the preferred choice of antibiotic for recommendation by the clinicians. However, there is a limitation of orally accessible nitrofurantoin formulation for patients with systemic involvement and serious upper UTI.4 The major limitations in our findings include difficulties in rationalization and representation of antimicrobial resistance patterns of uropathogens in wider population in the Indian subcontinent since this was a hospital-based study where only women attending the Obstetrics and Gynecology departments consented to participate in the study, and provided the urine samples. Similarly, the most challenging aspects of clinically prescribed drugs are the development of resistance with prolong course of treatment in UTI patients resulting in a threat towards multidrug resistance uropathgens. Moreover, the resistance/ sensitivity changes as the year progresses since our study is five years old. Since the development of drug resistance among pathogens of urinary tracts is a process of evolving adaptation, surveillance with proper monitoring of patients treatment regimes should be conducted routinely by clinicians for effective treatment.
Amidst the paucity of reports about UTI, this study is the first of its kind that has been conducted with non-pregnant women for determining UTI incidences which includes the impact of age on its occurrence along with their mode of resistance. Although the development of drug resistance in bacteria is nearly impossible to stop, since it has gradual process of adaptation to various extreme conditions towards survival, sharing of information on change in pattern of resistance with regular monitoring to the physician can prove to be impactful in treating UTIs. This study will help in monitoring the status of antimicrobial resistance pattern among bacterial pathogens causing UTI in non-pregnant women and to upgrade the treatment regimen suitable for a particular geographical location simultaneously with individualistic approach vis-a-vis. Besides this, the study will provide an insight into the rate of prevalence of uropathogens and their pattern of resistance in non-pregnant womens of the clinical setting which can be comparable to other regions of the country as well as to the world.
The authors are thankful to the Director and Institutional Ethics Committee, Asian Institute of Public Health, Bhubaneswar for permission to carry out the investigation. DS gratefully acknowledges the Department of Higher Education, Government of Odisha (Grant No. 26913/HED/HE-PTC-WB-02-17/OHEPEE) for infrastructure development to Centre of Excellence in Environment and Public Health, Ravenshaw University, Cuttack. All the study participants are duly acknowledged for their voluntary participation in this study.
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest.
DS and BP conceptualized and designed the study, did data analysis and prepared the manuscript. PD collected clinical data instruments and data analysis. JRM conducted the laboratory experiments. AP and SJ drafted and edited the manuscript. All authors read and approved the final manuscript for publication.
This study has been approved by the Institutional Ethics Committee, Asian Institute of Public health (AIPH) (AIPH ethics ref: ERC/ No: 2015-09).
AVAILABILITY OF DATA
All datasets generated or analyzed during this study are included in the manuscript.
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