In-vitro Susceptibility of Mycoplasma capricolum Subsp. capripneumoniae Pakistan Strain to Commercially Available Quinolones

Mumtazur Rahman1, Farhan Anwar Khan1,*, Umar Sadique1, Ijaz Ahmad1, Shakoor Ahmad1, Faisal Ahmad1,2, Hayatullah Khan1,3, Muhammad Saeed1, Faiz Ur Rehman1, Ibrar Hussain1, M. Faraz Khan1, M. Izhar ul Haque1 and Hanif-ur-Rehman1,3

1College of Veterinary Sciences, Department of Animal Health, Faculty of Animal Husbandry and Veterinary Sciences, 25120, The University of Agriculture, Peshawar, Khyber Pakhtunkhwa,

2Directorate of Livestock and Dairy Development (Extension), Peshawar, 25000, Khyber Pakhtunkhwa

3Directorate of Livestock and Dairy Development (Research), Peshawar, 25000, Khyber Pakhtunkhwa

ABSTRACT

Contagious caprine pleuropneumonia (CCPP) caused by Mycoplasma capricolum subsp. capripneumoniae (Mccp) is a highly contagious and deadly disease of small ruminants, especially goats. It is an economically important disease, causing high morbidity and mortality in goats. More recently Mccp Pakistan strain has been identified and isolated by our laboratory. Alarmingly, antimicrobials in animals are inappropriately using and resultantly leading to antimicrobial resistance (AMR) including mycoplasmas, which are causing serious infections in ruminants. Since the growth curve of our local strain and its susceptibility to commonly using antimicrobials is unknown. Therefore, this study was aimed to evaluate the growth curve and susceptibility of Mccp against commercially available quinolones in Pakistan by broth microdilution method. Quinolones including moxifloxacin, levofloxacin, ciprofloxacin, and enrofloxacin were selected for in vitro susceptibility of Mccp Pakistan strain. The concentration for each drug was measured distantly depending on high concentration available in the market and was then used in various concentrations ranges from higher to lower i.e. moxifloxacin 80-0.156 µg/ml, levofloxacin 250-0.488 µg/ml, ciprofloxacin and enrofloxacin 50-0.097 µg/ml. The resultant effective antimicrobial by minimum inhibitory concentration (MIC) and minimum mycoplasmacidal concentration (MMC) value was ciprofloxacin having lowest MIC and MMC value (0.390 µg/ml and 0.781 µg/ml), respectively. It was concluded that ciprofloxacin had best mycoplasmacidal and mycoplasmastatic activities among tested chemotherapeutics agents against Mccp. Ciprofloxacin could be more effective antimicrobial in field against Mccp infection in goat.

Article Information

Received 31 December 2019

Revised 11 February 2020

Accepted 04 March 2020

Available online 07 January 2021

Authors’ Contribution

MR, FAK, and US designed and conceived the study. MR, IB, HK, FA, and MFK carried out the research. MR, FAK, IA, SA, and MIH analyzed the data. MR, FAK, MS, and FR wrote the manuscript. FAK, US, and HR critically reviewed and revised the manuscript.

Key words

Antimicrobials, CCPP, Goats, Mccp, PCR, Quinolones.

DOI: https://dx.doi.org/10.17582/journal.pjz/20191231101203

* Corresponding author: [email protected]

0030-9923/2021/0002-0409 $ 9.00/0

Copyright 2021 Zoological Society of Pakistan

Introduction

Contagious Caprine Pleuropneumonia (CCPP) is an economically important disease of goats. CCPP is in OIE list of notifiable terrestrial and aquatic animal diseases, causing a considerable economic loss in terms of high morbidity and mortality in goat flocks in underdeveloped countries including Pakistan. Goat farming carries enormous significance in the rural economy, especially for non-agricultural poor needy people (Rehman et al., 2017). This category of animal is exposed to various problems in the country including petty management, underfeeding, communicable and non-communicable diseases. In a group of communicable diseases, CCPP is a trans-boundary disease and is responsible for up to 60-80% mortality in an exposed group of caprine (OIE, 2008). CCPP is caused by a member of minimal, simplest and slow-growing class mollicutes known as Mycoplasma capricolum subsp. capripneumoniae (Mccp), further classified as a member of the Mycoplasma mycoides cluster (Swai et al., 2013). Clinical signs of the disease comprised low to very harsh cough, mucopurulent nasal discharge, dullness, debilitation, loss of appetite and elevated temperature. Nonavailability of an effective vaccine makes control of the disease difficult. However, chemotherapy is a major approach in the control strategy of disease (Gomez-Martin et al., 2013). Therefore the selection of antimicrobial for reliable and efficient chemotherapy, control and prevention of disease caused by mycoplasma is mandatory. As these bacteria lack cell walls, therefore they are resistant to some antibiotics, such as penicillin’s and cephalosporins, that inhibits cell wall synthesis of bacteria. Treatment of the respiratory disease is mostly carried out by commercially available antibiotic agents with fluctuating success. Due to the mixed and inappropriate doses of antimicrobials, infection most probably leads to development of resistance in mycoplasma, which ultimately leads to therapeutics failure (Scott and Menzies, 2011; Laura et al., 2006). Another major reason of antibiotic failure and progression of bacterial resistance in developing countries are quacks, inferior quality of drugs, inappropriate treatment duration and quick substitution of therapeutic agents (Canton et al., 2013; Mathew et al., 2007). The indiscriminate and irrational use of common antimicrobials in animals may develop wide range of resistance against the pathogenic bacteria. Mycoplasma species are resistant to most antimicrobial drugs because of the lack of cell wall. The antimicrobial agents which act on nucleic acid and protein synthesis are commonly used against Mycoplasmosis in small ruminants (Clothier et al., 2012). The most commonly used antibiotics are enrofloxacin, tylosin, gentamycin, and oxytetracycline with different degree of success (Laura et al., 2006). The continuous use of antibiotics in small ruminants irrespective of proper diagnosis leads to an increased antibiotics resistance (Scott and Menzies, 2011). Different pathogenic Mycoplasma species develop resistance against spectinomycin, tylosin and oxytetracycline in many countries of Europe (Ayling et al., 2000). In Pakistan, many chemotherapeutics agents are used in respiratory infection of small ruminant without any veterinary supervision, so the potential for the incidence of resistance to antibiotics should be considered. The goal of this research was to analyzed in vitro susceptibility of frequently using members of quinolone group against Mccp local strain. Local strain of Mccp causing CCPP was isolated recently by our laboratory for the first time in Pakistan. Outcomes of this research will help veterinarians and poor farmers in proper treatment of Mccp infection.

 

Materials and methods

Cultivation of Mycoplasma capricolum subsp. capripneumoniae local strain

The study was carried out in Pathology Laboratory of Department of Animal Health, Faculty of Animal Husbandry and Veterinary Sciences, The University of Agriculture Peshawar. The sampling was carried out in the Northern and Central zones of Khyber Pakhtunkhwa, Pakistan. The Mccp local strain was isolated from lungs, pleural fluid and tracheal samples of infected goats with CCPP. The local strain isolated by our laboratory was used in this study (unpublished data). The Mccp local strain was cultivated in PPLO (2.1%) (Difco), supplemented with 20% de-complemented horse serum (Thermo-scientific), 10% fresh yeast extract (Difco), 0.2% glucose (Difco), 0.4% sodium pyruvate (Sigma Aldrich), 80000 IU/100 ml Penicillin G (Sigma Aldrich) under 5% CO2 at 37oC conditions for 7-10 days and examined periodically for color change, turbidity and whirling movement of Mccp growth. The slight turbid or color changed sample was subcultured on PPLO agar for the appearance of fried egg colonies of 0.1 to 0.3 mm in diameter having dense elevated center was suggestive of Mccp species colonies (OIE, 2013).

Confirmation of Mycoplasma capricolum subsp. capripneumoniae Pakistan strain by PCR

The DNA from mccp culture was extracted by boiling method as described elsewhere (Tabatabaei et al., 2014). The harvested Mccp culture was centriguged at 15000 x g for 5 min and the supernatant was discarded. The pellet was resuspended in distilled water and boiled for 5 min. The sample was again centrifuge at 15000 x g for 1 min. The supernatant was used as a DNA template. The species specific primers, Mccp-Spe-F: 5ˊ- ATCATTTTTAATCCCTTCAAG-3ˊ and Mccp-spe-R:5ˊ- TACTATGAGTAAGAGTAATTATATTAATATA- TGCAA- 3ˊ were used for the molecular conformation of Mccp by PCR as described previously (Woubit et al., 2004; Shah et al., 2017). A 25 µl PCR reaction was prepared by mixing 10 µl of master mix, 1.75 µl of each primer, 3.5 µl of DNA template and 8 µl of PCR water. The PCR conditions was set at an initial denaturation step of 3 min at 95°C, followed by 34 cycles of 30 sec at 95°C, 15 sec at 53°C and 15 sec at 72°C. The final extension step was for 5 min at 72°C. The PCR product was then run on gel electrophoresis using 1% molecular grade agarose gel with the addition of 2 µl DNA Gel stain. The gel was then observed in gel documentation system.

Growth curve determination

For determination of turbidity of bacterial culture method was used. Growth curve of Mccp was also determined through viable count method as described previously (Benson, 2002).

Antimicrobial susceptibility test

An antimicrobial activity of chemotherapeutics against Mccp local strain was accomplished through broth microdilution assay. Four different commercially available quinolones including Moxifloxacin, Levofloxacin, Ciprofloxacin, and Enrofloxacin were employed to sort out its effectiveness against local isolates of Mccp. The broth microdilution assay was carried out as described by Shah et al. (2017) and Hannan (2000). Briefly, MIC (minimum inhibitory concentration) of four above mentioned antibiotics were accomplished in sterile 96 well plate. Fresh 100µl PPLO broth was added to wells starting from column number 2-11. PPLO broth (200µl) was added to column 1 as a negative control, whereas 200µl bacterial culture was added to column 12 as positive control. Then 100µl of each antimicrobial was added to column 2 and serially diluted two fold to column 11 as presented in Table I. Further 100µl of Mccp culture (0.5x106 CFU/ml) were added to each well of column 2 to 11. The plate was then incubated at 37oC having 5% CO2 and was observed periodically for growth in the positive control (column 12) and results were taken after 7 days. The experiment was performed in triplicate.

Minimum mycoplasmacidal concentration (MMC) of antimicrobials

For identification of minimum mycoplasmacidal concentration the tested broth (those wells which have no mycoplasmal growth/no color change) were subcultured on PPLO agar in petri plates and incubated at 37oC having 5% CO2 and examine for Mccp colonies (Ahmad et al., 2015).

Statistical analysis

The data was analyzed by SPSS 20.0 software for a statistical significance. One-way ANOVA was carried out for checking statistical difference among various antibacterial agents used in broth microdilution assay Steel et al. (1997). LSD (least significant difference) test was carried out to split the means which were significantly different at P ≤ 0.05.

 

Result

Molecular confirmation of Mycoplasma capricolum subsp. capripneumonaie local strain by PCR

The PCR confirmed that the strain used in this study was belonged to Mccp species by using primers targeting 16s-rRNA gene. On gel electrophoresis of the PCR product, an amplicon size of 316 bp was obtained that confirmed the Mccp local strain.

Growth curve of Mycoplasma capricolum subsp. capripneumoniae

The growth curve analyses of Mccp local strain confirmed that Mccp is a fastidious and slow growing specie of mycoplasma. The different phases of Mccp growth were as follow; lag phase ranges from “0” h to “38” h, Log/logarithmic or exponential phase ranges from “38th to “72nd h, the stationary phase “72nd to “104th h and death/decline phase started from “104th h onward.

Minimum inhibition concentrations (MIC) of antimicrobial agents using broth microdilution method

For the detection of antimicrobials MIC, microtiter plate (96 well) was used and the antimicrobials were two-fold diluted as presented in Table I from lift to right, each antimicrobial agent was replicated in duplicate, and MIC was analyzed for each antimicrobial separately. The antimicrobial susceptibility assay determined that MIC value of Moxifloxacin was 2.5 µg/ml against Mccp, while Levofloxacin exhibited MIC value of 0.976 µg/ml. Moreover, MIC value of ciprofloxacin was 0.3906 µg/ml, whereas Enrofloxacin had shown MIC value of 3.125 µg/ml against Mccp culture (Fig. 1). Based on the assay most effective chemotherapeutic with lowest MIC value of 0.3906 µg/ml against Mccp was ciprofloxacin which

 

Table I.- Two-fold serial dilution of chemotherapeutics used for in-vitro susceptibility trial.

S No.	Antimicrobial agent	Dilutions (µg/ml)
1	Moxifloxacin	80	40	20	10	5	2.5	1.25	0.62	0.31	0.15
2	Levofloxacin	250	125	62.5	31.25	15.62	7.81	3.90	1.96	0.97	0.48
3	Ciprofloxacin	50	25	12.5	6.25	3.12	1.56	0.78	0.39	0.19	0.09
4	Enrofloxacin	50	25	12.5	6.25	3.12	1.56	0.78	0.39	0.19	0.09

 

showed color change from red to yellow in wells number “C10 and D10”. Additionally, Ciprofloxacin also having a lowest mycoplasmacidal value of 0.7812 µg/ml among the tested quinolones.

Minimum mycoplasmacidal concentration (MMC) of antimicrobial by culturing tested broth

The analyses of MMC identified ciprofloxacin as most effective antibiotic with lowest MMC value of 0.781 µg/ml against Mccp. The MMC of Levofloxacin, Moxifloxacin, and Enrofloxacin against Mccp were 0.976 µg/ml, 2.5 µg/ml and 6.25 µg/ml, respectively.

 

Discussion

Bacterial respiratory diseases are common in animals, especially in goats and are responsible for heavy economic loses in terms of morbidity and mortality. In bacterial disease, the mycoplasmal infections poses high risks to caprine population causing huge mortality and downgrade animal production (Onger et al., 2011; Sharif and Ghulam, 2009; Nicholas, 2002). Mycoplasma genus comprises many disease-causing species which have a propensity for respiratory organs and leading to harsh respiratory syndrome in small ruminants (Manso-Silvan et al., 2007). The respiratory disease of small ruminants is commonly treated with commercially available antibiotics having a various level of results (Laura et al., 2006). The results of most therapeutic agents are mainly based on timely reaction to disease and choosing of more suitable antibiotics with correct doses and length of treatment time. The presence of some lipoproteins on the surface of mycoplasma makes it difficult to treat because of their rapidly changing antigenic structure (Bradbury, 2005; Behrens et al., 1994). Making of biofilm is additional major escape/resistance mechanism adopted/developed by mycoplasmas against various antibiotic agents (McAuliffe et al., 2006). Commonly using antimicrobials against mycoplasma disease are oxytetracyclines, Enrofloxacin and tylosin having a distant level of results (Laura et al., 2006). Antibiotic resistance is an emerging problem of the 21st century and holds a serious threat to public health all over the world. At the time of discovery of these chemotherapeutic agents mostly disease-causing antigen was susceptible. However, careless use of antimicrobials leaded to mutation in microorganisms, which ultimately reduced the effectiveness of broad-spectrum antimicrobials (Gautier et al., 2002; Bradbury et al., 1994). The first line of treatment recommended by US, Australia, and Europe against mycoplasma infections was macrolide. However, the efficacy of macrolides has rapidly been declined from 85% to 67% during last decade and a greater level of resistance has been found in Asia-pacific region (Shah et al., 2017; Lau et al., 2015). The second line of treatment for mycoplasma recommended by US Centers for Disease and Prevention is quinolone (Wohlkonig et al., 2010). However, there are increasing reports of resistance to quinolone in mycoplasmal infection in animals usually caused by species like M. agalactiae and M. bovis (Sulyok et al., 2014; Paterna et al., 2013; Mustafa et al., 2013). Keeping in view the above reports current research was directed to determine the different phases of Mccp growth and to detect the in-vitro effectiveness of commercially available quinolones against Mccp Pakistan strain through broth microdilution assay to find out its minimum inhibitory concentration (MIC) and minimum mycoplasmacidal concentration (MMC).

The results of current study re-confirmed that Mccp Pakistan strain is a fastidious and slow growing species of mycoplasma, till date there is no such information available on the growth curve or growth phases of Mccp Pakistan strain. Growth curve determination of Mccp Pakistan strain is helpful in numerous experiments like estimation of in vitro and in vivo growth, the expression profile of pathogen, identification of antigenic and virulence-related factors of the pathogen during different phases of growth, vaccine preparation, and evaluation of the performance of various antimicrobials. The current study also found that Mccp Pakistan strain is susceptible to all four tested members (Moxifloxacin, Levofloxacin, ciprofloxacin, Enrofloxacin) of quinolones having a different level of MIC and MMC. The investigation of current study unmasks that ciprofloxacin was a potent antimicrobial agent having lowest MICs value of 0.3906 µg/ml against Mccp Pakistan strain. These outcomes are in concurrence with reports about ciprofloxacin that it is the most potent antimicrobial among the tested antibacterial against the infections caused by mycoplasmas (Mustafa et al., 2013; Antunes et al., 2007). Such conclusions were also demonstrated by a researcher that ciprofloxacin is a broad spectrum antibacterial and have range activity against mycoplasma species (Kenny et al., 2001). An additional study unveiled ciprofloxacin as an efficient antimicrobial against mycoplasmal isolates having lowest MIC value of 0.06-0.5 µg/ml (Antunes et al., 2015). Similarly our results were further supported by the findings reported elsewhere (Antunes et al., 2007). The report indicated an in-vitro susceptibility of field isolates of Mycoplasma agalactiae and found that ciprofloxacin has the lowest MIC value of 0.125-0.5 µg/ml against Mycoplasma agalactiae. Such results of ciprofloxacin with lowest MIC value of 0.05 to 1 µg/ml against Mycoplasma mycoides subsp. capri was also reported previously (Paterna et al., 2016). Correspondent judgment was also described for various antimicrobials against Mycoplasma hominis, Mycoplasma pneumoniae and Ureaplasma urealyticum and dug out that ciprofloxacin is a potent antibiotic drug with low MIC value ranging from 0.25-1.0 µg/ml (Kenny and Cartwright, 2001). Being a broad spectrum antibacterial activity and due to non-availability of ciprofloxacin for veterinary practice, it poses a strong mycoplasmacidal action against Mccp as reported through the MIC and MMC values in the current study. The results of our research reveal that broth microdilution assay is a better approach for assessing antibacterial activity. The above-mentioned assay has been flourishingly used for in vitro evaluation of chemotherapeutic agents by numerous researchers (Roberts, 1992; Taylor et al., 1997; Hannan, 2000; Mustafa et al., 2013; Jin et al., 2014).

The absence of standard CLSI-accredited MIC determining methodology for assessing of veterinary mycoplasma MIC, leading to hardness with explaining the effect of in vitro antibacterial activities. The road map approved by CLSI for other pathogen is regularly used to judge the significance of efficacy with in vitro mycoplasma sensitivity testing (Ayling et al., 2000; Francoz et al., 2005; Gerchman et al., 2009; Nicholas et al., 2003). This shows that Mccp maybe classify as sensitive to an antibacterial if it meets the sensitive category of CLSI-accredited standard for other veterinary pathogens. Therefore Levofloxacin, Moxifloxacin, and Enrofloxacin fall in susceptible criteria for respiratory pathogen at less than or equal to 2-4 µg/ml, 1-4 µg/ml, 1-4 µg/ml, respectively.

 

Conclusions

It is concluded that the Mccp Pakistan strain is susceptible to quinolone group of antibiotics. Amongst the tested quinolone, Ciprofloxacin was found the most efficacious antibiotic with lowest MIC value (0.390 µg/ml) and lowest MMC value (0.781 µg/ml), while enrofloxacin against Mccp was found showing highest MIC value of 3.125 µg/ml and MMC value of 6.25 µg/ml. The broth microdilution assay is a suitable method for determination of MIC of antimicrobials.

 

Acknowledgement

The research work was supported by the research project funded under the Pak-US Science and Technology Cooperation Program, Phase 7, 2017. This program is supported and implemented by the National Academy of Sciences (NAS) in the U.S. and by the Higher Education Commission (HEC) in Pakistan.

 

Statement of conflict of interest

The authors declare no conflict of interest.

 

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