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Incidence of Urinary Tract Infection among Pregnant Women Attending Antenatal Clinic at Federal Medical Centre, Bida, Niger-State, North Central Nigeria

Akobi O.A*, Inyinbor H.E, Akobi E.C, Emumwen E.G, Ogedengbe S.O, Uzoigwe E.O Amlscn, Abayomi R.O, Emumwen E.F Amlscn, Okorie I.E Bmls

Medical Microbiology Department, Fedral Medical Centre, Bida, Niger-State, Poastal Code

Abstract: OBJECTIVE: To determine the bacteriological aetiology and incidence of Urinary Tract Infections (UTIs) and antibacterial susceptibility patterns among pregnant women attending antenatal clinics at Federal Medical Centre, Bida, Niger-State, using the gold standard of culture. STUDY DESIGN: Data were obtained from the Medical Microbiology Department Registry from Ante-natal women coming for routine ante natal clinic between January 2010 and December 2012. Mid-stream urine samples were collected from a total of 1242 pregnant women between the ages of 15 and 54 years. Samples were collected inside sterile disposable universal bottles from pregnant women suspected to have UTIs at first antenatal booking. Data was coded, computed and analysed using SPSS version 16.0 and p values ≤0.05 were considered to be statistically significant. RESULT: Out of 1242 pregnant women with in the age bracket 15 and 54years in this study, our research showed that the incidence of UTI in this population was 46.1%, statistically significant (p = 0.046, with mean age of 30.92 years and standard deviation of ± 5.46). Escherichia coli were the most prevalence uropathogen (60%), followed by Staphylococcus aureus (28.3%). Escherichia coli was susceptible to Nitrofurantoin and Gentamycin (61.4%) and (51.5%) respectfully. CONCLUSION: The incidence of urinary tract infection of 46.1% uropathogen in this study is of public concern. Therefore, periodic screening should be carried out on pregnant women during antenatal clinics for symptomatic or asymptomatic UTIs.

Keywords: incidence, pregnancy, urinary tract infection, susceptibility

Received February 26, 2014; Revised March 21, 2014; Accepted April 21, 2014

Citation: Akobi O.A, Inyinbor H.E, Akobi E.C, Emumwen E.G, Ogedengbe S.O, Uzoigwe E.O Amlscn, Abayomi R.O, Emumwen E.F Amlscn, Okorie I.E Bmls, Incidence of Urinary Tract Infection among Pregnant Women Attending Antenatal Clinic at Federal Medical Centre, Bida, Niger-State, North Central Nigeria. American Journal of Infectious Diseases and Microbiology, 2 (2). 34-38. January 2014. doi:10.12691/ajidm-2-2-2

1. Introduction

Urinary Tract Infection (UTI) is an infection caused by the presence and growth of microorganisms anywhere in the urinary tract. It is perhaps the single most common bacterial infection of mankind [1].

Urinary tracts include organs that collect, store and release urine from the body which include: kidneys, ureters, bladder, urethra and accessory structures. Urine formed in the kidney is a sterile fluid that serves as a good culture medium for proliferation of bacteria [2]. UTI affect all age groups, but women particularly pregnant women are more susceptible than men, due to pregnancy, short urethra, easy contamination of urinary tract with faecal flora and various other reasons [3,4]. Asymptomatic bacteriuria (ASB), occurring in 2–11% of pregnancies is a major predisposition to the development of pyelonephritis, which is associated with obstetric complications, such as preterm labour and low birth weight infants.

Bacteriuria is defined as the presence of >10⁵ colonies of a single pathogen per millilitre of urine. It may be either an asymptomatic bacteriuria (ASB of pregnancy) or symptomatic acute cystitis and acute pyelonephritis [5]. The female urethra is relatively short and is anatomically proximal to the vagina, which is colonized with organisms from the gastrointestinal tract. Normal physiological changes in pregnancy place women at risk for pyelonephritis. There is also relative obstruction of the ureters because the enlarging uterus physically blocks them, and the hormonal milieu of pregnancy leads to relaxation of the smooth muscle of the ureters and the bladder. Furthermore, the glycosuria and aminoaciduria of pregnancy provide an excellent medium for bacterial proliferation [6,7,8]. Untreated upper UTI in pregnancy carries documented risk of morbidity, and rarely, mortality to the pregnant women [9]. Sexually active young women are disproportionately affected. An estimated 40% of women reported having had a UTI at some point in their lives [10]. Urinary tract infection is a serious health problem affecting millions of people each year and is the leading cause of Gram-negative bacteraemia. UTIs are also the leading cause of morbidity and health care expenditures in persons of all ages. In the United States, it is estimated from surveys of office practices, hospital-based clinics and emergency departments that UTI account for over eight million cases of UTI annually and more than 1 million hospitalizations, with an overall annual cost in excess of $1 billion [10,11,12].

Also, the anatomical relationship of the female urethra to the vagina makes it liable to trauma during sexual intercourse as well as bacteria being massaged up the urethra into the bladder during pregnancy, the moist environment of the females perineum favours microbial growth and predisposes females to bladder contamination [13,14,15]. Other factors including improper cleaning of the perineum, the use of napkins and sanitary towel together with pregnancy and sexual intercourse contribute to the higher incidence of UTI in various women. In addition, urine of females was found to have more suitable pH and osmotic pressure for the growth of Escherichia coli than urine from males [16,17].

According to Azubuike et al, [18], commonest mode of infection is the ascending route, through which organisms of the bowel flora contaminated the urethra, ascends to the bladder and migrate to the kidney or prostrate. Clinical manifestation of UTI varies but the symptoms range from dysuria, lower abdominal pain, pyrexia of unknown origin and foul smelling urine [19]. There are number of conditions associated with an increased prevalence of asymptomatic bacteriuria in pregnancy. Low socioeconomic status, sickle cell traits, diabetes mellitus and grand multiparity have been reported; each is associated with two-fold increase in the rate of bacteriuria [20]. UTI is the second most common clinical indication for empirical antimicrobial treatment in primary and secondary care, and urine samples constitute the largest single category of specimens examined in most medical microbiology laboratories [21].

According to Alexander et al, [24] standard quantitative urine culture should be performed routinely at first antenatal visit. The prevalent organisms that are usually isolated from UTIs patients are Escherichia coli, Staphylococcus aureus, Klebsiella aerogenes, Pseudomonas aeruginosa, Proteus species, Streptococcus faecalis and Enterobacter species. The prevalence and degree of occurrence of one or two of these organisms over others are dependent on the environment (Omonigho et al, [2]).

AIM: This study reports on the bacteriological aetiology and incidence of Urinary Tract Infections (UTIs) and antibacterial susceptibility patterns among pregnant women attending antenatal clinics at Federal Medical Centre, Bida, Niger-State, North Central, Nigeria.

2. Materials and Methods

2.1. Study Population

The research was a retrospective studies carried out between January 2010 to December 2012 and was exempted from ethical approval.

Urine samples were collected from a total of 1242 pregnant women between the ages of 15 and 54 years. All these persons were pregnant women attending the antenatal clinics at Federal Medical Centre, Bida, Niger- State, North Central, Nigeria.

2.2. Sample Collection

One thousand two hundred and forty two (1242) mid-stream urine (MSU) samples were collected inside sterile disposable universal bottles from pregnant women suspected to have UTIs at first antenatal booking. They were instructed on how to collect samples and the need for prompt delivery to the laboratory. The samples were labelled and transported to the Medical Microbiology laboratory of the hospital and were processed within 30 min to 1 hour of sample collection.

2.3. Analysis, Characterization and Identification of Bacteria from Urine Samples

Urine specimen were cultured on Cysteine Lactose Electrolyte Deficient (CLED) agar and Blood agar as described by Cheesbrough [22], specimen that yielded pure isolate of bacterial pathogens were included in this study. Isolated bacterial species were characterized by Gram stain followed by microscopic examination, motility test and biochemical tests and identified according to standard bacteriological methods as highlighted by Omer and Fadil [23] and Cheesbrough [22].

Data was coded, computed and analysed using SPSS version 16.0 and p values ≤0.05 were considered to be statistically significant.

3. Result

Out of 1242 Samples examined in this study, 572(46.1%) had significant uropathogen and 670(53.9%) yielded no bacteria growth.

Table 1 showed the incidence of UTI in relation to age of the subjects. A higher percentage of pregnant women 52(53.1%) and 106(53%) with UTIs were found within the age brackets of 20-24years and 35-39years respectively. The age groups 15-19years had the least uropathogen 2(0.3%) and age groups 50-54 years, yielded no significant growth of bacteriuria.

Table 1. INCIDENCE OF UTIs IN RELATION TO AGE DISTRIBUTION OF PREGNANT WOMEN

Table 2 showed overall incidence of uropathogen in the study age groups among pregnant women. The highest number of uropathogen was found within the age groups of 25-29years with 196(34.3%) followed by 30-34years with 180(31.5%) and 35-39years 106(18.5%) while the lowest uropathogen was found in 15-19year, 2(0.3%) while 50-54years had no significant growth.

Table 2. Overall Incidence of Uropathogen against Age Distribution among Pregnant Women with UTI

Table 3 showed the incidence of bacteria isolated in UTI among pregnant women and the percentage prevalence of the uropathogen. Escherichia coli 342(60.0%) was found to be the most prevalence uropathogen followed by Staphylococcus aureus 162(28.8%), Candida albicans 46(8.0%), Pseudomonas aeruginosa 10(1.7%), Klebsiella pneumoniae 6(1.0%), Serratia marcescens 4(0.7%) and Proteus mirabilis 2(0.3%) being the lowest prevalence isolates.

Table 3. PERCENTAGE OCCURENCE AND DISTRIBUTION OF BACTERIA PATHOGEN IN UTIs AMONG PREGNANT WOMEN

Table 4 showed the antibiotics susceptibility pattern of the isolates.

Escherichia coli the highest uropathogen showed high susceptibility to Nitrofurantoin (61.4%) and Gentamycin (51.5%) but least susceptible to Cotrimoxazole (15.8%), Cefuroxime (14.0%), and Ampicillin (2.3%). Staphylococcus aureus the second uropathogen was susceptible to Augmentin (60.5%), Nitrofurantoin (51.9%) and least susceptible to Cloxacillin (19.8%), Nalidixic acid (17.3%) and Ampicillin (2.5%). Klebsiella pneumoniae was susceptible to Nitrofurantoin and Cefuroxime both by (66.7%) but completely resistance to Ampicillin by (100%). Pseudomonas aeruginosa was susceptible to Gentamycin and Ceftriazone both by (40%) but resistance to Augmentin, Azythromycin, Streptomycin,Cefuroxime, and Cotrimoxazole all by (100%). Proteus mirabilis was susceptible to Azythromycin, Gentamycin, Ceftriazone and Cotrimoxazole by (100%) but resistance to Augmentin, Streptomycin, Ampicillin, Nitrofurantoin and Nalidixic acid by (100%). While Serratia marcescens was susceptible to Gentamycin, Nitrofurantoin and Nalidixic acid by (100%) but resistance to Ampicillin, Augmentin, Azythromycin and Cefuroxime by (100%) respectively.

Table 4. Antibiotic Susceptibility Pattern of the Urinary Isolates from Antenatal patients

4. Discussion

Out of 1242 pregnant women with in the age bracket 15 and 54years in this study, our research showed that the incidence of UTI in this population was 46.1%, statistically significant (p=0.046, ∝ = 30.92 and S.D = ± 5.46).

This finding is in agreement with Okonko et al, [24] who reported incidence of 47.5% at Ibadan, Nigeria and Ajayi et al, [25] who reported 40% but our finding is relatively higher than 8.9% reported by Kalantar Enayat et al, [26], 10.4% by Alemu Agersew et al, [27], 8.5% reported Sevki Celen et al,(28) and 14.6% by Masinde et al, [29].

However, our finding is lower than a prevalence rate of 71.6% reported in a similar study by Jellheden et al, [30], 88.6% by Akerele et al, [31] and 52.6% by Igwegbe et al, [32].

Obiogbolu [33], stated that high incidence of UTI may be due to hormonal effects produced during pregnancy which reduces the tone of uteri musculature aided by mechanical pressure from the gravid uterus resulting to urinary stasis thus encouraging bacterial proliferation in urine. It may also be due to social economic status and sexual intercourse [34,35].

Our study showed that there was high incidence of UTIs between age groups 25-29years (34.3%) followed by 30-34years (31.5%). This result was similar to the findings of Adeyeba et al, [36] and Obiogbolu et al, [37].

The most common uropathogen isolated in this study was Escherichia coli (60%). Our report is in support of other findings where Escherichia coli was reported as major uropathogen [26,27,28,38].

However, our finding is contrary to Akinola et al, [25] where Staphylococcus aureus was reported as the commonest isolate in ASB in antenatal patient. Other isolated uropathogen in this study were Staphylococcus aureus (28.3%), Klebsiella pneumoniae (1.0%), Pseudomonas aeruginosa (1.7%), Proteus mirabilis (0.3%), Serratia marcescens (0.7%), and Candida albicans (8.0%).

Stamey and Sexton [39], stated that bacteria uropathogen are likely to originate from gastrointestinal tract and ascend via faecal-urethral route.

The antibiotics susceptibility showed that Escherichia coli exhibited (61.4%) and (51.5%) susceptible to Nitrofurantoin and Gentamycin respectively. In contrast Escherichia coli showed (70.9%) and (64.9%) resistant rate to Streptomycin and Ceftriazone respectively and least susceptible to Ampicilin (2.8%), Cefuroxime (14%) and Cotrimoxazole (15.8%).

Also, it was observed that Nitrofurantoin and Gentamycin were susceptible to most of the uropathogens isolated. This report is similar to Akinola et al, [25] who reported susceptibility rate of Nitrofurantoin (100%) and Gentamycin (50%) against Escherichia coli in ASB among antenatal patient, Igwegbe et al, [32] reported Nitrofurantoin (100%) and Gentamycin (73.3%) and Turpin et al, [40] in Ghana.

Gupta and Stamm, [41] stated that Nitrofurantoin is relatively safe in pregnancy and effective against most UTIs, but may cause haemolysis in glucose-6-phosphate dehydrogenase deficient infant if used close to term.

Shanson et al, [42] says Gentamycin is effective in treating asymptomatic bacteriuria in pregnant women but known to be nephrotoxic and reported resistance rate of Gentamycin in urinary isolates to be (2%). This is contrary to the finding of Kalantar enayat et al, [26] who reported Cefotaxime, Ciprofloxacin and Cefotizoxime as drug of choice in UTI.

Some isolates were moderately susceptible to Augmentin, Azythromycin, Ceftriazone and Nalidixic acid.

However, Ampicilin, Cefuroxime and Cotrimoxazole were poorly susceptible to the tested isolates. This report is similar to the study carried out in (1996) at Seychelles Victoria hospital where Escherichia coli isolated from urine samples was (78.6%) resistance to Ampicilin [43].

Also, Mezue et al, [44] at university of Nigeria found Cotrimoxazole to be virtually useless against uropathogen. The emergence of antimicrobial resistance is primarily due to excessive and often unnecessary use of antibiotics in human and animals. [45,46,47]. It is established in African population that self medication with antibiotics led to drug resistance [48,49].

5. Conclusion

The high incidence of urinary tract infection of 46.1% uropathogen in this study is of public concern. The predominant uropathogen was Escherichia coli and was susceptible to Nitrofurantoin and Gentamycin.

It was observed in this locality that Nitrofurantoin and Gentamycin were drugs of choice.

Authors therefore recommended that routine microbiological analysis and antibiotic susceptibility test of mid-stream urine samples of pregnant women should be carried out so as to enhance in the administration of drugs for the treatment and management of UTIs.

Also, there should be public education programmes on the importance of proper personal hygiene and good environmental sanitation habits mostly during pregnancy; periodic screening should also be carried out on pregnant women at the antenatal clinics for symptomatic or asymptomatic UTIs.

Conflict of Interest

No conflict of interest.

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