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Tetracyclines resistance in Mycoplasma and Ureaplasma urogenital isolates derived from human: a systematic review and meta-analysis

Annals of Clinical Microbiology and Antimicrobials volume 22, Article number: 83 (2023) Cite this article

Abstract

Background

Urogenital Mycoplasma infections are considered an important public health problem, owing to the presence of antibiotic resistance or decreased susceptibility, the treatment options are limited.

Objective

Therefore, this meta-analysis aimed to estimate resistance rates of genital Mycoplasmas to tetracyclines (tetracycline, doxycycline, and minocycline).

Methods

We searched the relevant published studies in PubMed, Scopus, and Embase until 3, March 2022. All statistical analyses were carried out using the statistical package R.

Results

The 26 studies included in the analysis were performed in 15 countries. In the metadata, the proportions of tetracycline, doxycycline, and minocycline resistance in Mycoplasma and Ureaplasma urogenital isolates were reported 14.2% (95% CI 8.2–23.2%), 5% (95% CI 3–8.1%), and 11.9% (95% CI 6.3–21.5%), respectively. According to the meta-regression, the tetracycline and minocycline resistance rate decreased over time. Although, the doxycycline resistance rate increased over time. There was a statistically significant difference in the tetracyclines resistance rates between different continents/countries (P < 0.05).

Conclusion

The prevalence rate and antibiotic susceptibility profiles vary geographically. Therefore, rigorous or improved antimicrobial stewardship, contact tracing, and enhanced intensive surveillance systems are necessitated for preventing the emergence and further spreading of tetracyclines resistance in genital Mycoplasmas.

Introduction

Mollicutes class contains the Mycoplasma genus is the smallest free-living and self-replicating micro-organisms [1, 2]. The Mycoplasma genus is divided into respiratory and genital Mycoplasmas. The genital Mycoplasmas include Mycoplasma hominis and Ureaplasma parvum and Ureaplasma urealyticum, which are frequently found in the lower urogenital tract of sexually active healthy adults [3]. The prevalence rate of Mycoplasmas in the genital tract of sexually active Men and women is approximately 5–20% and 40–80%, respectively [4]. These microorganisms identified as causative agents of several urogenital disorders in adults and children and have global distribution [3, 5]. These disorders include bacterial vaginosis, non-gonococcal urethritis (NGU), cystitis, pyelonephritis, endometritis, and cervicitis [3, 6, 7]. Also, the caused infection by these organisms may be symptomatic or asymptomatic. It is proven, that asymptomatic infections are related to increased risks of pelvic inflammatory disease (PID), infertility adverse pregnancy outcomes [8]. In another hand, because of serious complications in newborns and immunocompromised patients, adequate treatment and bacterial eradication is crucial.

Owing to the absence of the cell wall in Mycoplasmas, these bacteria have a natural resistance to antibiotics affecting on the cell wall, like glycopeptides (vancomycin and teicoplanin) and beta-lactams (penicillins and cephalosporins) [9, 10]. However, these bacteria are susceptible to antibiotics that interfere with bacterial DNA replication (quinolones) and bacterial protein synthesis (tetracyclines and macrolides). Therefore, currently, the abovementioned antibiotics are known as the first-line treatment and primary choice in the empirical treatment caused by Mycoplasmas [5]. But M. hominis has developed resistance to quinolones globally [11]. Also, resistance owing to mutations in 23S rRNA caused resistance to erythromycin and azithromycin [12, 13]. Thus, in Mycoplasmas infections tetracyclines class (tetracycline, doxycycline, and minocycline) is recommended as a primary choice of chemical therapy, except for pregnant women and neonates [14].

The extensive overuse of tetracyclines has led to a gradual rise in resistance of Mycoplasmas and, tetracyclines resistance strain is a growing phenomenon worldwide [1, 7]. While, the rising rates of resistant isolates have been noted, a limited number of studies performed on the status of resistance to tetracyclines. Therefore, this systematic meta-analysis was conducted to survey the status of resistance to the tetracycline class, (tetracycline, doxycycline and minocycline) by analyzing the related published studies.

Methods

This review is reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (PRISMA) [15].

Search strategy and study selection

We systematically searched for relevant articles in PubMed, Scopus, and Embase (Until August 2021) by using the related keywords: ("Mycoplasma" OR "Mycoplasma hominis" OR "M. hominis" OR "Mycoplasma genitalium" OR "M. genitalium" OR "Ureaplasma" OR "Ureaplasma urealyticum" OR "U. urealyticum" OR "Ureaplasma parvum" OR "U. parvum" AND "antibiotic" OR "antimicrobial" OR "tetracycline" OR "doxycycline" OR "minocycline" AND "resistance" OR "resistant") in the Title/Abstract/Keywords fields. No limitation was used while searching databases. The search strategy was designed and conducted by study investigators. References lists of all related studies were also reviewed for any other related publication. The records found through database searching were merged, and the duplicates were removed using EndNote X9 (Thomson Reuters, New York, NY, USA). One of the team researchers randomly evaluated the search results and confirmed that no relevant study had been ignored. The authors did all these steps, and any disagreements about article selection were resolved through discussion. References from reviewed articles were also searched for more information.

Inclusion and exclusion criteria

The included studies met the following criteria: (1) original study that investigated tetracyclines (tetracycline, doxycycline, and minocycline) resistance in Mycoplasma and Ureaplasma urogenital isolates derived from human; (2) peer-reviewed articles published in English between 1978 and 2021; (3) specified the total number of tested Mycoplasma and Ureaplasma isolates; (4) reported the tetracyclines resistance rate in Mycoplasma and Ureaplasma isolates. The exclusion criteria were as follows: (1) studies that contained duplicate data or were overlapping articles; (2) no clinical Mycoplasma and Ureaplasma urogenital isolates; (3) reported antibiotic resistance of mycoplasmas other than M. hominis, U. urealyticum/parvum; (4) studied resistance to antibiotics other than tetracyclines; (5) reviews, meta-analysis and/or systematic review, and conference abstracts; (5) resistance rates were not clearly presented or reported.

Data extraction

The following items were extracted from each included study: first author, publication year, continent, country, participants’ characteristics (gender (male/female), type of complication) number of clinical M. hominis, U. urealyticum, and U. parvum isolates, number of tetracyclines resistance rate in M. hominis, U. urealyticum, and U. parvum isolates, and antimicrobial susceptibility testing (AST; MIC-Based methods and Mycoplasma kits). Data were collected by two independent examiners and verified by another researcher. The resistance rate was expressed as the number of resistant isolates divided by the total number of isolates tested.

Quality assessment

The quality of the included studies was assessed by two reviewers separately using an adapted version of the tool proposed by the Newcastle–Ottawa assessment scale adapted for cross-sectional studies [16]. A score ranging from 0 to 8 points was attributed to each study (≥ 6 points: high quality, ≤ 5 points: low quality). A higher score indicated a higher study quality. A third reviewer adjudicated in any cases where there was disagreement.

Statistical analysis

The studies presenting raw data on tetracycline, doxycycline, and minocycline resistance in Mycoplasma and Ureaplasma urogenital isolates derived from human were included in the meta-analysis that was carried out using the meta-prop [17] command in R statistical software on all prevalence statistics by antibiotic, region (continents/countries) and AST. The meta-analysis results consist of a prevalence statistic with 95% confidence intervals calculated from the weighted prevalence statistics for all the studies in the specified sub-group by antibiotic, region (continents/countries), and AST. Meta-regression models were used to check for changing antibiotic resistance over time and male/female ratio. Publication bias was assessed using Egger's and begg's test. All statistical interpretations were reported on a 95% confidence interval (CI) basis. All statistical analyses were carried out using the statistical package R 3.6.0 (R Foundation for Statistical Computing: Vienna, Austria) [18].

Study outcomes

The main outcome of interest was the proportion of tetracycline, doxycycline, and minocycline resistance in Mycoplasma and Ureaplasma urogenital isolates derived from human. A subgroup analysis was performed; [1] subgroup analyses were then employed by areas (continents/countries), [3] and AST. Meta-regression models were used to check for changing antibiotic resistance over time and male/female ratio.

Results

Systematic literature search

A total of 2741 records were identified in the initial search. From these, 2646 articles were excluded after an initial screening of the title and abstract due to their irrelevance and duplication. The full texts of the remaining 95 articles were reviewed (Fig. 1). From the 95 articles, 57 were excluded for the following reasons: (1) studies that contained duplicate data or were overlapping articles; (2) animal research, reviews, meta-analysis and/or systematic review, and conference abstracts; (3) tetracyclines resistance rates were not presented or reported. Finally, the 26 studies included [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44] were published between 1978 and 2021 (Additional file 1: Table S1).

Fig. 1
figure 1

Flow chart of study selection

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Characteristics of included studies

The 26 studies included in the analysis were performed in 15 countries. The majority of the studies included in the meta-analysis revealed the resistance to tetracycline (20 reports) followed by doxycycline (15 reports), and minocycline (10 reports). Figure 2 showing forest plot proportions of resistance isolates to selected included antibiotics. The proportion of each antibiotic and the subgroup analyses by continent/countries, genus, species, and AST, are shown in Table 1. The trends in resistance rates to tetracycline, doxycycline, and minocycline are summarised below.

Fig. 2
figure 2

Forest plot proportions of tetracycline (A), doxycycline (B) and minocycline (C) resistance isolates to selected included antibiotics

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Table 1 Prevalence of tetracyclines resistance in Mycoplasma and Ureaplasma urogenital isolates
Full size table

Tetracycline resistance

The susceptibility to tetracycline was determined in 20 studies, including 19,424 Mycoplasma and Ureaplasma isolates [M. hominis (984 isolates), U. urealyticum (17,871 isolates), and U. parvum (434 isolates)]; the proportions were 20% (95% CI 9–38%), 14% (95% CI 6–29%), and 4% (95% CI 1–19%) in M. hominis, U. urealyticum, and U. parvum, respectively, with substantial heterogeneity (I2 > 88%; P = 0.21) was observed between included studies (Table 1, Fig. 2). Also, significant publication bias was detected (Egger rank correlation test, P = 0.0310). To analyze the trends for changes in the rate of tetracycline resistance in recent years, we performed a meta-regression analysis for changes in the proportion of tetracycline resistance to Mycoplasma/Ureaplasma urogenital isolates over time (Fig. 3). According to the meta-regression, the tetracycline resistance rate decreased over time (r = −0.080; 95% CI −0.153 to −0.007, P = 0.032). We performed a meta-regression analysis for changes in the proportion of tetracycline resistance in male/female ratio to Mycoplasma/Ureaplasma urogenital isolates. According to the meta-regression, the tetracycline resistance rate increased in male/female ratio (r = 0.012; 95% CI −0.011 to 0.036, P = 0.312). Among 14 countries (from 5 continents) reporting resistance data for tetracycline, 5 (35.7%) countries (Cuba, Iraq, Italy, Senegal, and Tunisia) reported that > 15% of isolates had tetracycline resistance. There was a statistically significant difference in the tetracycline resistance rates between different countries (P < 0.01) (Table 1). There was a statistically significant difference in the tetracycline resistance rates between different continents (P < 0.01), and this rate was higher in South America than Africa (44% vs 28%), Asia (44% vs 16%), North America (44% vs 10%), and Europe (44% vs 6%). No significant difference was found in the AST method (P = 0.98) (Table 1).

Fig. 3
figure 3

Meta-regression analysis for changes in the proportion of tetracycline (A), doxycycline (B) and minocycline (C) resistance to Mycoplasma/Ureaplasma urogenital isolates over time

Full size image

Doxycycline resistance

The susceptibility to doxycycline was determined in 15 studies, including 19,203 Mycoplasma and Ureaplasma isolates [M. hominis (710 isolates), U. urealyticum (18,371 isolates), and U. parvum (122 isolates)]; the proportions were 5% (95% CI 1–13%), 6% (95% CI 3–11%), and 3% (95% CI 0–31%) in M. hominis, U. urealyticum, and U. parvum, respectively, with substantial heterogeneity (I2 = 93%; P = 0.83) was observed between included studies (Table 1, Fig. 2). Also, significant publication bias was detected (Egger rank correlation test, P = 0.0070). To analyze the trends for changes in the rate of doxycycline resistance in recent years, we performed a meta-regression analysis for changes in the proportion of tetracycline resistance to Mycoplasma/Ureaplasma urogenital isolates over time (Fig. 3). According to the meta-regression, the doxycycline resistance rate increased over time (r = 0.059; 95% CI −0.027 to 0.145, P = 0.180). We performed a meta-regression analysis for changes in the proportion of doxycycline resistance in male/female ratio to Mycoplasma/Ureaplasma urogenital isolates. According to the meta-regression, the doxycycline resistance rate decreased in male/female ratio (r = −0.021; 95% CI −0.052 to 0.011, P = 0.205). Among 10 countries (from 4 continents) reporting resistance data for tetracycline, 4 (25%) countries (Cuba, Iraq, Cameroon, and Senegal) reported that > 6% of isolates had doxycycline resistance. There was a statistically significant difference in the doxycycline resistance rates between different countries (P < 0.01) (Table 1). There was a statistically significant difference in the doxycycline resistance rates between different continents (P < 0.01), and this rate was higher in South America than Africa (17% vs 14%), Asia (17% vs 4%), and Europe (17% vs 2%). No significant difference was found in the AST method (P = 0.07) (Table 1).

Minocycline resistance

The susceptibility to minocycline was determined in 10 studies, including 1256 Mycoplasma and Ureaplasma isolates [M. hominis (92 isolates) and U. urealyticum (988 isolates)]; the proportions were 18% (95% CI 3–66%) and 9% (95% CI 4–21%) in M. hominis and U. urealyticum, respectively, with substantial heterogeneity (I2 > 88%; P = 0.5) was observed between included studies (Table 1, Fig. 2). Also, significant publication bias was detected (Egger rank correlation test, P = 0.6886). To analyze the trends for changes in the rate of minocycline resistance in recent years, we performed a meta-regression analysis for changes in the proportion of minocycline resistance to Mycoplasma/Ureaplasma urogenital isolates over time (Fig. 3). According to the meta-regression, the minocycline resistance rate decreased over time (r = −0.015; 95% CI −0.066 to 0.035, P = 0.550). We performed a meta-regression analysis for changes in the proportion of minocycline in male/female ratio to Mycoplasma/Ureaplasma urogenital isolates. According to the meta-regression, the minocycline resistance rate increased in male/female ratio (r = −0.009; 95% CI −0.030 to 0.012, P = 0.396). Among 7 countries reporting resistance data for tetracycline, 5 (55.5%) countries (Cuba, Iraq, UK, and USA) reported that ≥ 10% of isolates had minocycline resistance. There was a statistically significant difference in the minocycline resistance rates between different countries (P < 0.01) (Table 1). There was a statistically significant difference in the minocycline resistance rates between different continents (P < 0.02), and this rate was higher in North America than South America (33% vs 15%), Europe (33% vs 12%), and Asia (33% vs 10%). No significant difference was found in the AST method (P = 0.63) (Table 1).

Discussion

Mycoplasma and Ureaplasma have been identified as important human pathogens of considerable urogenital problems such as non-gonococcal urethritis (NUG), cervicitis, and PID [45]. This family of bacteria (Mycoplasmataceae) remains understudied compared with other etiological agents of urinary tract infection (UTI), with less global financial support. In another hand, the innate absence of cell wall in Mycoplasma and Ureaplasma have led to intrinsic resistance to beta-lactams (one of the most routinely used antibiotics which act on cell wall) and limits the options for chemical therapy [46]. Also, innate resistance to lincosamides has been seen in Ureaplasma spp. Furthermore, Mycoplasma and Ureaplasma have resistance to sulphonamides, trimethoprim, and rifampicin [46].

Alternatively, tetracyclines, fluoroquinolones, and macrolides are widely used as effective anti-Mycoplasma agents [47]. Tetracyclines are ‘broad-spectrum’ antibiotics and have potent bacteriostatic activity against different pathogens, even Mycoplasma and Ureaplasma [48, 49]. While tetracyclines are divided into three generations, they have similar action mechanisms: first-generation, such as conventional tetracycline, which gets from biosynthesis. Second-generation like doxycycline and minocycline are semi-synthetic with improved properties and a wider spectrum of activity [50]. Finally, tigecycline is synthetic and located in third-generation with the highest and widest activity against gram-positive and negative bacteria (mini). Regarding action mechanisms, they can be passing through the bacterial membrane for reaching to target. This category of antibiotics is one of the most commonest used drugs against different forms of mycoplasmosis including urogenital or respiratory infections in adults, or animal infections on the farm as well [51]. The tetracycline antibiotics are capable of reversible binding to the 30S subunit of the bacterial ribosome, this interaction leads to the prevention of the association of aminoacyl-tRNA with the acceptor site in the bacterial ribosome and thus inhibition of the protein synthesis [51].

In this systematic review and meta-analysis, we calculated the resistance rate of tetracycline, doxycycline, and minocycline in Mycoplasma and Ureaplasma spp, recovered from human urogenital. The tetracyclines resistance was greatly variable in different literatures performed in various locations. Probably, the various consumption rates of these antibiotics in different parts of the world are the major reason for zonal differences in resistance rates of urogenital Mycoplasma and Ureaplasma species to the tetracyclines category [46]. Thus, reliable antibiotic susceptibility testing to obtain successful therapy is required. In another hand, Mycoplasmas and Ureaplasma like any other Mollicutes, are fastidious, thus their culture and routine antimicrobial susceptibility testing depend on specialized growth medium requirements. Therefore, commercial kits have been applied for detection and antimicrobial susceptibility testing [52, 53]. Undoubtedly, each commercial kit has special efficiency in antimicrobial susceptibility testing. On the other hand, a large number of available kits have not confirmed breakpoints by Clinical and Laboratory Standards Institute (CLSI)-recommended standard criteria for genital mycoplasmosis, and require confirming by other methods [54]. As a result, almost all urogenital mycoplasmosis infections are treated empirically [55]. Maybe, resistance heterogeneity and empirical therapy are two reasons for resistance development.

Our results demonstrated relatively high tetracyclines (including tetracycline, doxycycline, and minocycline) resistance rates in M. hominis, U. urealyticum, and U. parvum. It was also, the lowest resistance rate in M. hominis, U. urealyticum, and U. parvum had been seen to minocycline. Moreover, the highest rate of resistance among these three antibiotics is associated with tetracycline, most likely due to massive and frequent misuse of this antibiotic [56]. These results are in concordance with the previous meta-analysis [5]. While chemical therapy is capable to abolish urogenital mycoplasmosis, failed treatment makes persistent infections and resistant-strains expansion. Other studies showed that the tetracyclines-resistant rate is increasing and changing over time [46, 57]. Therefore, successful treatment with these antibiotics will be limited, more challenging, and costlier in further infections [45, 57].

Tetracyclines resistant bacteria applied genes encoding resistance which were placed on plasmids and transposons elements. These elements are mobile and make bacteria competent to horizontal gene transfer and resistance expansion among pathogens including M. hominis, U. urealyticum, and U. parvum [58, 59]. The development of tetracycline resistance in Mycoplasmas is associated with two major mechanisms including an active drug efflux pump and the production of ribosome-protecting proteins by the tet (M) gene [60]. This gene is located on transposon and encodes tetM protein (homolog of bacterial elongation factors) which causes conformational changes in the 30S ribosomal subunit and inhibition of tetracycline binding [47]. Moreover, several other mechanisms contribute to tetracyclines resistance including a decreased influx of antibiotics into the cell, antibiotic modification by enzymes, and target site modification by a mutation in the tetracycline-binding unit of 16S rRNA [5, 51, 56].

Recently, tetracyclines resistance Mycoplasmas have increased greatly; this phenomenon is a growing problem worldwide. Undoubtedly, an uninterrupted effort is required to urgently discover new therapeutic options, which lead to improved treatment. Raising knowledge in resistance mechanisms to tetracyclines and the development of chemical substances provided a potent capacity to introduce new effective generations of tetracyclines. However, not only the new generation of tetracyclines but also the international monitoring system exposing reliable antimicrobial susceptibility testing is crucial.

Interpretation of the present study results is constrained by several limitations. Firstly, variety in sample size can affect the analysis. But, the problem was solved by calculating and reporting of relative weight for each study. Another limitation is excluding the published articles other than the English language, therefore some articles would have been missed.

Conclusions

In summary, regarding the present meta-analysis, the overall resistance rate to tetracyclines (tetracyclines, doxycycline, and minocycline) is relatively high in urogenital Mycoplasmas including M. hominis, U. urealyticum, and U. parvum. Also, the geographical variations in the prevalence of resistance showed that resistance in America continent is higher in comparison to other continents. These geographical variations demonstrate the importance of regional antibiotic susceptibility testing to control and eliminate infections caused by resistant strains.

Availability of data and materials

All the data in this review are included in the manuscript. The data of the study is with the corresponding author of the article and can be made available on request.

Abbreviations

PID:

Pelvic inflammatory disease

PRISMA:

Preferred reporting items for systematic reviews and meta analyses

AST:

Antimicrobial susceptibility testing

CI:

Confidence interval

NUG:

Non-gonococcal urethritis

UTI:

Urinary tract infection

CLSI:

Clinical and Laboratory Standards Institute

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Acknowledgements

Analysis and clinical application of urolithiasis in Tibetan and Qiang people in Jiuzhaigou (Y2021013).

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  1. Urology Department of Affiliated Hospital of Chengdu University, Chengdu, 610000, Sichuan, China

    Xiaoyan Wen & Yue Yang

  2. Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Sirjan Branch, Sirjan, Iran

    Mojgan Sarabi Nobakht

  3. Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, Iran

    Ebrahim Kouhsari, Sara Hajilari & Matin Zafar Shakourzadeh

  4. Department of Microbiology, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran

    Khalil Azizian

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Contributions

YY, SH, and MZS substantially contributed to the data extraction of the review article of the work. EK substantially contributed to the conception, design, drafting, and interpretation of the relevant literature of the review article of the work. MSN substantially contributed to the analysis of the work. KHA and XW have been involved in writing and acquisition of data or revising the review article for intellectual content. All authors agreed and confirmed the manuscript for publication.

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Wen, X., Nobakht, M.S., Yang, Y. et al. Tetracyclines resistance in Mycoplasma and Ureaplasma urogenital isolates derived from human: a systematic review and meta-analysis. Ann Clin Microbiol Antimicrob 22, 83 (2023). https://doi.org/10.1186/s12941-023-00628-5

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Annals of Clinical Microbiology and Antimicrobials

ISSN: 1476-0711

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