The overall prevalence of UTI in pregnant women in this study was 16.4 %. This is comparable to the prevalence of UTI reported in in Mwanza City, Tanzania 16.8% 10, in Nairobi, Kenya 15.7% 11, in Kano, Northern Nigeria 15.8%12 and in Bangalore, India 15 % 13.
Whereas a higher prevalence was reported in Ambo Central Ethiopia 18.7% 14, in Derna City Libya 49.3% 15, in Ismailia, Egypt 29% 16, in Benin city, Nigeria 21%17, in Saudi Arabia 53.5 % 18, in Nepal 37.8% 19 respectively. A lower prevalence was reported from Iran 13.1% 20, Gondar Northwest Ethiopia 10.4 % 21, Korela India 13.4%22, Khartoum Sudan 14% 23. This variation in prevalence might be due to across different studies from one country to another and among regions of the same country might be attributed to the difference in associated factors, sample size, social habits of the community, the standard of personal hygiene and education.
The prevalence of UTI among symptomatic and asymptomatic pregnant women in this study was 9.5% and 6.9% respectively. The occurrence of UTI case among asymptomatic was in line with the previous study done in Cameroon 7.8% 24, in Kanpur, India 7.3% 25 and in Makkah, Saudi Arabia 8% 26, On the other hand, a low prevalence of 0.13% In meta-analysis in Iran 27, in Colombo, Sri Lanka 3.6% 28 and in Ghana 5.5% 29 was reported asymptomatic UTI. While higher prevalence was recorded in Hawassa, Southern 21.2% 30, in Bangladesh 10.2% 31 and in Nairobi, Kenya 21.5% 32.
In this study the symptomatic study was 9.5%, These result of symptomatic UTI were agree with a study conducted from in Khartoum Sudan 12.1% 23, in Makkah, Saudi Arabia 12%26 and in Northeastern Ethiopia 11.9% 33. But higher prevalence rate in Mekelle Northern Ethiopia 21.1% 34, in Bangladesh 17.9% 35, in in Goba and Sinana Woredas, Bale Zone, Southeast Ethiopia 35.3% 36 and in South-western Uganda 35% 37. The differences may be the variation of methodologies and study populations might affect prevalence in different sites.
In this study, Gram-negative bacteria isolates were more prevalent (71%) than Gram-positive bacteria isolates (29%). A similar finding was found from Ambo town, Central Ethiopia 69.6% and 30.4% for Gram negative and Gram positive pathogens 14, in Tanzania also Gram negative bacteria and gram positive bacteria were reported 61.9% and 38.1% 38 respectively. This could be due to the presence of unique structure in Gram negative bacteria which help for attachment to the uroepithelial cells and prevent bacteria from urinary lavage, allowing for multiplication and tissue invasion–resulting in invasive infection and pyelonephritis in pregnancy 39.
Among isolated pathogens, were E. coli was the most predominant bacteria 43.5%, which is similar with previous studies in Ambo town, Central Ethiopia 46.4% of isolated cases 14, in Bangalore, India 43.9% 40 and in Nairobi, Kenya 40.0% was reported41. However, it was lower than reported in the previous studies conducted in different countries, which was India 53.8%, Italy 57.1% and Iran 57.25%22,42,43. E. coli is the most common microorganism in the vaginal and rectal area. Because of anatomical and functional changes and difficulty of maintaining personal hygiene during pregnancy, may increase the risk of acquiring UTI from E. coli 44. The second most common isolate was CONS 16 % and comparable findings have been reported in different studies like in Karamara Hospital Jigjiga, Eastern Ethiopia 12% 45, Saint Paul’s Hospital Millennium Medical College, Addis Ababa, Ethiopia 14.3% 46 and in Dil Chora Referral Hospital, Dire Dawa, Eastern Ethiopia19.2% 47.
In this study, susceptibility pattern of Gram-negative bacteria showed that most of the isolates were sensitive to meropenem (95.9%), ceftriaxone (79.6%), norfloxacin (77.5%), gentamicin (75.5%), nitrofurantoin (75.5%) and ciprofloxacin (71.4%) and comparable studies conducted in different study area like in Addis Ababa, Ethiopia that showed highly sensitive to meropenem (75.2%), nitrofurantoin (93.1%), gentamicin (85.2%), ceftriaxone (82.2%), cefuroxime (79.3%), and ciprofloxacin (75.2%)46 and in South Nigeria showed sensitive to gentamicin (53% -100%), imipenam (67%-93%), ciprofloxacin (between 57%-75%) 48, In Hawassa, Southern Ethiopia the present study, 80% of Gram negative bacteria were susceptible to meropenem, ciprofloxacin, gentamicin, nitrofurantoin, and norfoxacin 49. In this study, the highest resistance was shown to ampicillin (93%-100%) among gram-negative bacteria, this due to the drug is with low cost and often can be purchased without prescription in different areas. This implies that ampicillin cannot be used as empirical therapy for urinary tract infection particularly in the study area. This also agrees with the study done in Karamara Hospital Jigjiga, Eastern Ethiopia 45.
In this study the other drugs also showed highly resistance to Gram-negative were tetracycline (71.4%), trimethoprim–sulfamethoxazole (57.1%), amoxicillin clavulanic acid (55.1%) and nalidixic acid (51%) and this agree the other study done in Dil Chora Referral Hospital, Dire Dawa, Eastern Ethiopia AMP (89.5%), amoxicillin (73.7%), and TTC (73.7%), NA (52.6%), except nitrofurantoin (57.9%)47 and in Mbarara Regional Referral Hospital, South-western Uganda were highly resistant to Amoxicillin, Ampicillin, and Amoxicillin/Clavulanic acid at 95.7%, 95.0%, and 72.9% 37. The findings of this study is not in line with the reports from Kenya41. These differences could be due to variations in antibiotic prescription patterns across various countries.
In this current study, the Gram-negatives, the predominant isolate was E. coli, which is resistant to ampicillin (93.3%), TTC (73.3%), SXT (60%), nalidixic acid (53.3%) and AMC (46.7%). Similar findings have been reported from previous studies in Dire Dawa, Eastern Ethiopia, South-western Uganda and Addis Ababa, Ethiopia 37,46,47. The other isolated Gram negative bacteria include K. pneumonia showed more than 65% sensitive to meropenem, gentamicin, ceftriaxone, ciprofloxacin and nitrofurantoin this agreed with the study done in South-western Uganda 37, K. pneumoniae was 100% resistant to ampicillin, Similar findings were done in Adigrat General Hospital, Northern Ethiopia and Karamara Hospital Jigjiga, Eastern Ethiopia 45,50.
In this study, the Gram positive bacterial isolates were relatively sensitive to erythromycin, cefoxitin, ceftriaxone, nitrofurantoin, gentamicin, ciprofloxacin and each accounted 85%, 85%, 75%, 75%, 70% and 65%. This was comparable with the finding from Ivory Coast, Dire Dawa, Eastern Ethiopia and Gonder Ethiopia 47,51,52 However, in contrast with study report from Southern Ethiopia, which ceftriaxone was 100% resistant to gram-positive bacteria 53.
In this study, Gram positive bacteria showed highly resistance to ampicillin 90% and tetracycline 55%. This could be due to the infrequent use of the drug in the study area. Comparable result was reported in Gonder Ethiopia 52, in Lagos, Nigeria, and Benishangul Gumuz Region, Western Ethiopia54. Coagulase negative staphylococci, which were the predominant isolates from Gram-positives 55% and was found 63% to 81% sensitive to erythromycin, cefoxitin, ceftriaxone, nitrofurantoin gentamicin and ciprofloxacin. However, in contrast was shown nitrofurantoin to 26.7% resistance in study done in Ethiopia 55, while comparable studies done in Hawassa, Ethiopia 49.
In this study, S. aureus which constituted for 45% of the gram positive bacteria showed 66.7%-88.9% were sensitive to erythromycin, cefoxitin, ceftriaxone, nitrofurantoin, ciprofloxacin and gentamicin, this agree with study done in Hawassa, Ethiopia, Benishangul Gumuz Region, Western Ethiopia and Nairobi, Kenya41,49,54. In contrast to research done in Addis Ababa, Ethiopia, which erythromycin was highly resistant 60%46. However, this study showed 100% ampicillin to S. aureus, similar study done in Jigjiga, Ethiopia, Dire Dawa, Eastern Ethiopia and Addis Ababa, Ethiopia 45,47,56. This is caused by use of empirical treatment against bacterial infections of the urinary tract infection in the study area. This implies that ampicillin cannot be used as empirical therapy for urinary tract infection particularly in the study area.
In this study, MDR was seen in 89.9% of all bacteria isolated. Our finding is higher than studies done in same regions of Ethiopia like 57.1% in Addis Ababa, and 73% in Mekelle 34,46, in Tanzania 77% 38 and in Eastern Uganda 77.5 57. . Our finding is lower than studies done in South-South Nigeria 100%48, in Kenya 96% 11 and same regions in Ethiopia like in Dire Dawa 100%, Gondar 95% and Jigjiga 96% 21,45,47. This indicates that multi drug resistance was found to be very high to the commonly used antibiotics. Antibiotic resistance has been recognized as the consequence of antibiotic use and abuse 58. Therefore, the reasons for this alarming phenomenon might be inappropriate and incorrect administration of antimicrobial agents in empiric therapies and lack of appropriate infection control strategies, which can cause a shift to increase prevalence of resistant organisms in the community.
In the present study, the result of multivariable logistic regression models revealed that socio-demographic factors among pregnant women were statistically significance with no formal education and low level of family income (≤ $100) [ P= 0.045, AOR=3.183 (1.027, 9.866)] and [P=0.022, AOR=5.225 (1.270, 21.500)]. The non-formal education was agreed with study done in Goba and Sinana Woredas, Bale Zone, Southeast Ethiopia [AOR = 6.617; CI = 1.87–9.94] 36. in contract with low level education the studies done in Medan, Indonesia, and Uyo, Nigeria 48,59. Low-income status was another factor that was related with high prevalence of UTI among pregnant women. A similar finding was reported in other studies on pregnant women in Dire Dawa, Eastern Ethiopia and in Adigrat General Hospital, Northern Ethiopia 47,50. This could be due to the relation of low socioeconomic status with nutrition and immunity especially in pregnant women. In contrast studies were done in Jigjiga, Ethiopia, Medan, Indonesia, and Northeastern Ethiopia 33,45,59.
In the study, obstetrics and clinical characteristics were shown that, highly significant proportion of UTI was recorded among those study subjects with prior history of UTI. The multivariate logistic regression analysis of current study showed that 3.7 more likely to occur the UTI compared with pregnant women that have not the previous history of UTI [P= 0.000 AOR=3.734 (1.855, 7.515)]. This finding is similar with report from Uganda (P= 0.002), Libya (P= 0.00), Egypt (P= 0.001), India (P=0.0423), and same regions of Ethiopia like Gondar, (p-value= 0.001), Dire Dewa (p-value= 0.006) and Addis Ababa (P= 0.004)15,21,22,37,46,47,60. The possible explanation for this association could be due to the existence of antibiotic-resistant strains from the previous infection.
In the current study, participants with the previous history of indwelling catheterization had about 3.2 times chance of developing UTI [P= 0.012 AOR=3.216 (1.287, 8.038)] among pregnant women. This finding agrees with similar reports from Northeastern Ethiopia, Addis Ababa, Ethiopia and Gonder Ethiopia 21,33,46. This could be due to long duration of catheterization, frequent catheterization or contamination during inserting catheters. However other studies done in Dire Dawa, Eastern Ethiopia and Jigjiga Eastern Ethiopia disagreed of this study 45,47.
In the present study, there was no statistical significant association between prevalence of UTI among pregnant women and maternal age, residence, marital status, occupation, gestational period, gravidity, History of diabetes mellitus, History of abortion History of obstetric and gynecologic surgery and History of premature labor. this results were agreed the report from Bangladesh 35, Nairobi, Kenya except the maternal age 32, Nigeria 48, Goba and Sinana Ethiopia 36, Dire Dawa, Eastern Ethiopia 47 and Addis Ababa, Ethiopia except history of abortion46.