Research Article

Prevalence of Mycotic Mastitis and Evaluation of Some Virulence Potential of Candida albicans Isolated from Mastitic Goats

Saddam Hussein Mahmoud* and Shaimaa Nabhan Yassein

Department of Internal and Preventive Medicine, College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq.

Received | May 06, 2023; Accepted | June 22, 2023; Published | July 23, 2023

*Correspondence | Saddam Hussein Mahmoud, Department of Internal and Preventive Medicine, College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq; Email: [email protected]

Citation | Mahmoud SH, Yassein SN (2023). Prevalence of mycotic mastitis and evaluation of some virulence potential of Candida albicans isolated from Mastitic goats. Adv. Anim. Vet. Sci., 11(9):1417-1427.

DOI | https://dx.doi.org/10.17582/journal.aavs/2023/11.9.1417.1427

ISSN (Online) | 2307-8316

Copyright: 2023 by the authors. Licensee ResearchersLinks Ltd, England, UK.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

INTRODUCTION

Mastitis is a disease caused by a wide range of microorganisms that causes significant economic losses and damages to the dairy industry by reducing milk production, increasing antibiotic treatment, and culling costs (Yanuartono et al., 2019; Unny et al., 2020). It is a complicated condition that develops as a result of interactions between an agent, an animal, and the environment. It is a severe problem for both human and animal health (Machado, 2018; Toledo and Dacey, 2021). When pathogens enter the mammary gland through the teat opening, they thrive in the udder, producing irritation (Pacha et al., 2020).

Bacteria, mycoplasmas, viruses, fungi, and algae are the most common causes of mastitis (Nitz et al., 2021). Yeasts are the primary pathogens that cause mycotic mastitis (Constable et al., 2017), and Candida species are the most common yeasts found in mycotic mastitis (Du et al., 2018).

Even though mycotic mastitis is less common than other agents (Sudhakara et al., 2018; Yanuartono et al. 2019; Mohammed and Yassein, 2020). It was rapidly increased over the past ten years and is usually cited as the significant cause of mycotic mastitis in ruminants (Mohammed and Yassein, 2020). There was high prevalence of several fungi in milk from goats in the Baghdad area with subclinical mastitis, which could be harmful to people’s health (Hasan and Yassein, 2018).

Additionally, C. albicans is considered as normal flora in humans and animals (Abharian et al., 2018; Talapko et al., 2021). It is an opportunistic pathogen that causes infection in immunocompromised hosts. Several factors contribute to this yeast’s virulence and pathogenicity, including the production of germ tubes, and extracellular hydrolytic enzymes, particularly phospholipase and proteinase, phenotyping switching, and biofilm formation. These virulence factors are linked to C. albicans pathogenicity (Udayalaxmi and D’Souza, 2014). Due to similarities in phenotypic traits between species, it is increasingly important to develop an accurate technique to accurately identify yeast species and prevent diagnostic errors when conducting morphological, biochemical, and physiological testing (Spanamberg et al., 2009). So, the aims of this study were to identify mycotic agents, assess the prevalence of mycotic mastitis, and evaluate the virulence of C. albicans that was isolated from mastitic goats.

Materials and Methods

Collection of milk samples

This work was carried out in the period of (January – July) 2022. The number of milk samples were 332. These were collected from 166 goats in Abu-Ghraib region and tested clinically and to detect sub-clinical mastitis by using the California mastitis test (CMT). Ten milliliters of milk were collected in sterile test tubes under aseptic conditions. They were immediately transported to the laboratory in an ice box. Afterwards, all milk samples that collected from apparently healthy udder were subjected to the CMT test. By using a horizontal plane, an equal volume of milk and CMT reagent were gently shaken in a paddle. The reaction was scored as negative, trace, or positive within (10-15) seconds, according to the procedure of Coles’ (1986) and Sadoon (2021).

Determination of mycotic isolates

Each milk sample was incubated at 37 ºC for (3-5) days on SDA containing 0.5 mg/ml Chloramphenicol. Sub- culturing was used to obtain pure colonies, which were then examined macroscopically and microscopically according to Washinton et al. (2006) for Mold. Whereas for Yeast detection, particularly suspected C. albicans, conventional methods represented by germ tube production, Urease production, chlamydospore formation, and identification by CHROM agar were employed (Neppelenbroek et al., 2014).

Detection of virulence factors of C. albicans

Preparation of yeast suspension

C. albicans isolates were activated on SDA after an overnight incubation at 37 ºC on Sabouraud dextrose broth. A small amount of activated pure colonies was transferred into 5 ml of phosphate buffered solution (PBS) at turbidity equal to 1.0 McFarland and contain 3×108 yeast cells/ml using a sterile loop (Deepa et al., 2015).

Detection of phospholipase production

Ten microliters of yeast suspension with a 1-McFarland turbidity level were inoculated onto the egg yolk agar surface and incubated there for 48 hours. Growing C. albicans on egg yolk agar and assessing the extent of the precipitation zone could determine the extracellular phospholipase activity of the yeast. According to the formula, the diameters of the colonies and the opacity zone were measured in millimeters (mm) (Mahmoudabadi et al., 2010).

Hemolytic activity

Ten microliters of the previously prepared yeast suspension were taken and spotted on SDA containing 7.0% human blood and 3.0% glucose. Each plate was incubated at 37°C for 48 hours. Any isolate that showed a clear zone of haemolysis around the colonies was considered positive for haemolytic activity (Favero et al., 2011). The enzymatic activity was measured manually for each isolate using the Hz value, which was calculated by the ratio of colony diameter to colony diameter plus zone of precipitation in (mm). The zone of enzymatic activity was calculated in accordance with Nazeer et al. (2020).

Determination of biofilm formation

C. albicans biofilm formation was assessed using the method described by Inci et al. (2012). A loop of yeast was cultured in a tube which contained 2.0 ml of Brain Heart Infusion Broth (BHIB) medium containing 0.25% glucose for 24 hours at 37°C. The tubes were then diluted at a 1:20 ratio with fresh prepared BHIB, and 200 µl was placed into sterile 96-well polystyrene microtiter plates, which were then covered with lids and incubated at 37°C for 24 hours. This plate was rinsed with PBS twice before being inverted to blot. Each well received 1.0 % crystal violet (200 µl) and was incubated for 15 minutes. After three rounds of PBS rinsing, 200 µl of an ethanol: Acetone combination (80:20v/v) were added to each well. The absorbance values were calculated at 590 nm using an ELISA reader. For each isolate, the biofilm formation experiment was done three times, average optical density (OD) values were determined, according to Rodrigues et al. (2010) and Ahmed (2015).

Molecular characterization

Extraction of Candida albicans DNA

Twenty-five of the most virulent C. albicans isolates were chosen to confirm the yeast. Some virulence genes were detected by molecular detection such as (PLB1, SAP1 and HWP1). The DNA was extracted from each isolate using a PrestoTM Mini gDNA Yeast Kit (Geneaid).

PCR amplification

The PCR reaction was carried out in a 25μl reaction 12.5 µl of Green Master Mix (Promega/USA), 1.0 µl of 10 picomol/µl primer (Table 1), 2.0 µl of DNA template, and the volume was brought up to 25 µl with nuclease-free water. Following PCR amplification, agarose gel electrophoresis was used to confirm gene amplification (Table 2).

Statistical analysis

The statistical analysis system- SAS (2018) program was used to detect the effect of difference factors in study parameters. Chi-square test was used to significant compare between percentage (0.05 and 0.01 probability) in this study.

Results and Discussion

The number of collected samples were 332 from a total of 166 goats, 31 halves were detected as clinical mastitis (9.33%), while the remainder were subjected to the CMT test, which revealed that 174 samples gave positive results for CMT with 57.8% which are high significant but 127 samples (42.19%) gave negative results for this test (Table 3 and 4).

 

Table 1: The oligonucleotide primer pair.

Target genes	Primers sequences (5’- 3’)		Amplicon size (base pair)	References
SC1	F	CGGAGATTTTCTCAATAAGGACCAC	658	Galan et al., 2006
	R	AGTCAATCTCTGTCTCCCCTTGC
PLB1	F	ATGATTTTGCATCATTTG	765	Mukherjee et al., 2001 and Soliman et al., 2020
	R	AGTATCTGGAGCTCTACC
SAP1	F	GCTTTTGCTGGTTGATGCCA	479	Al-abidy et al., 2019
	R	TGCTGATTGACCAGGACGAG
HWP1	F	ATG ACT CCA GCT GGT TC	503	Inci et al., 2013 Mohammadi et al., 2021
	R	TAGATCAAG AAT GCA GC

 

Table 2: The PCR thermocycler conditions.

Target genes	Primary denaturation	Secondary denaturation	Annealing	Extension	Final extension	References
SC1	95ºC, 2 min	94ºC, 30 s	60ºC, 30s	72ºC, 10s	72ºC, 10 min	Galan et al., 2006; Abd El-Razik et al., 2011
		40 cycles
PLB1	95ºC, 5min	94ºC, 1 min	52ºC, 1 min	72ºC, 1 min	72ºC, 5min	Mukherjee et al., 2001
		35 cycles
SAP1	95ºC, 2min	95ºC, 30s	58.3ºC, 30s	72ºC, 1 min	--	Al-abidy et al., 2019
		30 cycles
HWP1	95ºC, 5 min	94ºC, 30s	60ºC, 40s	72ºC, 50s	72ºC, 10 min.	Mohammadi et al., 2021
		34 Cycles

 

Table 3: The Percentage of Mastitic and Non Mastitic Halves.

Mastitis Form	No. of infected and non infected halves	%
Clinical mastitis	31/ 332	9.33%
Subclinical mastitis	174/301	57.8%
Non infected with mastitis	127/301	42.19%

 

As shown in Table 5, clinical mastitis was found in 25 goats as 31 halves (9.35%), with 12 halves (38.70%) having subacute clinical mastitis, 14 halves (45.16%) having acute clinical mastitis which are high significant, and 5 halves (16.14%) having peracute clinical mastitis.

The results of the current investigation indicated that 174 halves (57.8) of the samples had subclinical mastitis, which

 

Table 4: Forms of clinical mastitis in goats.

No. of Infected goats with clinical mastitis	No. of halves with clinical mastitis	No. of halves with subacute clinical mastitis	No. of halves with acute clinical mastitis	No. of halves with peracute clinical mastitis
25	31	12	14	5
%	100%	38.70%	45.16%	16.14%

 

was represented by 19 samples (10.92%) with a positive one (+1) CMT, 96 samples (55.18%) with a positive two (+2) CMT which are high significant, and 53 samples (33.9%) with a positive three (+3) CMT, as shown in Table 6.

 

Table 5: CMT score among milk samples of subclinical mastitis.

CMT score	No. of samples that give (+ve CMT)	%
Negative	0	0
Trace	0	0
+1	19	(10.92%)
+2	96	(55.18%)
+3	59	(33.90%)
Total	174	(100%)

 

Table 6: Percentage of mycotic mastitis.

No. of mycotic mastitis cases	No. of mold	No. of yeast
95	33	62
%	34.74%	65.56%

 

Percentage of mycotic mastitis

The current study found that mycotic mastitis affected 95/205 isolates (46.34%), with 33 isolates belonging to mold (34.74%), and 62 isolates returning to yeasts (65.26%) which are high significant (Table 7).

 

Table 7: Percentage of mold isolated from caprine subclinical mastitis.

Type of mold/ No. of isolate	No. of Penicillium spp.	No. of A. fumigatus	No. of A. terreus
33	11	15	7
100%	33.33%	45.45%	21.21%

 

Table 8: Percentage of yeast isolated from caprine subclinical mastitis.

Type of yeast/ No. of isolate	No. of C. albicans	No of C. kruzi	No. of C. glabrata	No. of C. tropicalis
62	42	7	11	2
100%	67.74%	11.29%	17.74%	3.22%

 

As shown in the Table 8, the mold types included 11 isolates of Pencillinum spp. (33.33%), 15 isolates of A. fumigatus (45.45%), and 7 isolates of A. terreus (21.21%).

Whereas 42 isolates of the different yeasts returned to the C. albicans (67.74%) which are high significant, 7 isolates of C. kruzi (11.29%), 11 isolates of C. glabrata (17.34%), and 2 isolates of C. tropicalis isolates (3.22%), (Table 9).

 

Table 9: Relation between CMT score and number of C. albicans isolated from subclinical mastitis.

CMT score	No. of C. albicans isolates	%
Negative	0	0
Trace	0	0
+1	1	(2.38%)
+2	22	(52.38%)
+3	19	(45.24%)
Total	42	(100%)

 

Percentage of caprine Candidal mastitis

The current work focused on the isolation of C. albicans from mastitic milk in Iraqi goats, with a 67.74% (high significant) overall isolation rate of yeasts (Table 9), and represented high ratio as curative agent of mycotic mastitis with 42/95 (44.21%).

 

Identification of C. albicans by conventional methods

The traditional diagnostic criteria were used to identify 42 clinical isolates of C. albicans. As shown in Figure 1, the macroscopical distinctive characteristics of C. albicanes were creamy, smooth, pasty, and convex colonies for 3–5 days after inoculation on SDA at 37°C that could become wrinkled with prolonged incubation. Lactophenol Cotton Blue stain was used for microscopic examination, which revealed the presence of pseudohyphae with clusters of budding cells. All of these isolates were then cultivated on specific medium, such as Corn Meal Agar, which is also known as the Dalmau plate method to promote the production of blastoconidia and chlamydospores, to confirm the diagnosis, as shown in Figure 2.

 

The Germ tube test, also known as the Reynolds-Braude phenomenon, yielded positive results for these isolates and may be considered the primary test for C. albicans identification. As shown in Figure 3, Germ tube formation was observed in 100% of the C. albicans isolates in the current study.

 

Another selective and deferential media employed for the detection of Candida spp. was Candida chromogenic agar, which was applied in accordance with the manufacturer’s instructions. In this research, C. albicans generated green colonies, as depicted in Figure 4. Colonies of C. glabrata isolates on CHROM agar were pink with a mauve core. Colonies of C. krusei could be easily recognized from other yeasts smooth, brown to brown purple colonies on this agar after 48 hours of incubation. All C. parapsilosis isolates showed a distinctive dark blue gray core color after 48 hours of incubation.

 

 

Results of virulence factors

The current paper investigated some C. albicans virulence factors such as phospholipase and hemolysin enzymes, which were produced by 32/42 (76.2%) and 35/42 (83.33%), respectively, of the total C. albicans isolates (Tables 10, 11 and Figures 6, 7).

 

Table 10: phospholipase activity of C. albicans isolates for subclinical caprine mastitis.

Pz value	No. of C. albicans isolates	Scored of isolates	% of isolates that produced phospholipase
1	10	-ve	32/42	76.19%
0.99-0.9	3	(+)
0.89-0.8	3	(++)
0.79-0.7	7	(+++)
<0.69	19	(++++)

 

Enzymatic activity values were scored and categorized as follows: Pz = 1: no enzymatic activity (-ve); Pz = 0.9-0.99: weak activity (+); Pz = 0.8-0.89: mild activity (++); Pz = 0.7-0.79: strong activity (+++); Pz = < 0.69 : very strong activity (++++).

 

Table 11: Hemolysis activity of C. albicans isolates for subclinical caprine mastitis.

Ph value	No. of C. albicans isolates	Scored of isolates	% of isolates that produced Hemolysis activity
1	7	-ve	35/42	83.33%
0.99-0.9	7	(+)
0.89-0.8	11	(++)
0.79-0.7	13	(+++)
<0.69	4	(++++)

 

Enzymatic activity values were scored and categorized as follows: Ph = 1: no enzymatic activity (-ve); Ph = 0.9-0.99 : weak activity (+); Ph= 0.8-0.89: mild activity (++); Ph = 0.7-0.79 : strong activity (+++); Ph = < 0.69 : very strong activity (++++).

 

Table 12: Biofilm formation of C. albicans.

No. of C. albicans isolates	Score of biofilm
	Weak	Moderate	Strong
42 (100%)	19 (45.25%)	18 (42.85%)	5 (11.90%)

 

 

 

 

Another virulence factor is biofilm formation, which was found in 100% of the C. albicans isolates, with different degrees, indicating that these isolates exhibited a high ratio of virulence factors linked to pathogenicity and infection severity (Table 12, Figure 8).

Molecular ıdentification of C. albicans

According to the findings of the virulence factor, 25 of the most virulent isolates of C. albicans were chosen for confirmation of the diagnosis using PCR. To extract DNA from 25 C. albicams isolates, a genomic DNA extraction kit was utilized. All C. albicans isolate DNA samples were successfully extracted, and the nano-drop device was used to check the purity and concentration of the DNA extracted then assessed using gel electrophoresis. varying from 75 to 100 ng/l, with a purity between 1.7 and 1.9. The extracted DNA sample was electrophoresed on an agarose gel at 75 volts for one hour before being seen under a UV light source (Figure 9).

KER1-specific gene was utilized to detect and identify C. albicans isolates by PCR, and SC1F and SC1R primers were employed to amplify the extracted DNA, which revealed a band of DNA fragmentation of 658 bp for detection C. albicans with 100% (Figure 10).

 

 

The PCR data presented here indicate that SC1F and SC1R amplification is are species specific, and as a result, they may contribute in specifically identifying C. albicans strains. A single pair of primers (SC1F and SC1R) derived from the KER1 gene sequence specific to C. albicans is used in the described PCR-based approach. The KER1 gene is amplified by these primers in a 670 bp fragment. The anticipated 670 bp amplicon was produced by every single clinical C. albicans isolate.

While PLB1, SAP1 and HWP1 genes were employed for detecting C. albicans virulence factor genes isolates had positive results, While HWP1 was not found in any of the examined C. albicans isolates (0%), PCR analysis revealed that 25 strains of C. albicans produced unique bands with molecular sizes of around 765 bp and 479 bp that contained PLB1 and SAP1 genes, with 100% (25 strains) and 80% (20 strains), respectively (Figures 11, 12)

 

 

The present study recorded high percent of subclinical caprine mastitis, this finding was consistent with the findings of Stuhr and Aulrich (2010), who stated that a large proportion of intramammary infections in dairy goats can be classified as subclinical mastitis with no or rare visible clinical symptoms.

The result of the current study was consistent with the finding of Hasan and Yasein (2018) who reported (53%) of the tested samples gave positive for CMT. The current study agrees with Al-Dujaily and Mahmood (2021) who found that the CMT caused a high positive (3+ score) response in all tested animals.

The present study demonstrated 42 isolates of C. albicans that were constituted high ratio of yeast infections when compared with other yeasts. This result is consistent with those of Hassan et al. (2012), who reported that the most commonly isolated species from goats with mastitis in Egypt were C. albicans (24%) and C. parapsilosis (14%).

In contrast to the current study, Ilhan et al. (2016) discovered that fungal agents were isolated from 19 of 170 goat milk samples (11.1%). In culture, 3 (1.7%) milk samples tested positive for Candida albicans, 2 (1.1%) for C. lusitaniae, 1 (0.5%) for C. parapsilosis, 1 (0.5%) for C. glabrata, and 2 (1.1%) for Cryptococcus neoformans. While Al-Abedi (2020), reported the presence of C. albicans in 4/11 (36.2%), C. tropicals in 3/11 (27.2%), C. krusei in 2/11 (18.1%), and C. parapsilosis and C. glabrata in 1/11 (9.09%) for each in his study.

All the macroscopic and microscopic characteristics of C. albicans and production of blastoconidia and chlamydospores, were similar to the findings of Atshan and Al-Haddad (2014) and Abdulla and Ismael (2023).

On the other hand, the current study was similar to the finding of Mattei et al. (2013) who confirmed that Germ tube formation was observed in 95% of the isolates and Phospholipase production was found to be high in 13 of the germ tube positive isolates.

This finding corroborated the findings of Manikandan and Amsath (2013). However, when the Urease test that was inoculated with C. albicans isolates, the test’s color did not change and remained yellow as seen in Figure 5.

Numerous virulence factors characterize C. albicans pathogenicity, but the most important of which is the secretion of hydrolytic enzymes (e.g., phospholipases, proteases, and hemolysins) that promote colonization and tissue incursion (Menezes et al., 2016). The enzymatic activity of Candida spp. has been reported to vary depending on the species and source of isolates (Gultekin et al., 2011).

It is generally known that C. albicans is resistant to common antimicrobials, particularly azoles, especially when Candida cells are in the form of biofilms (Henriques and Silva, 2021). By creating a thick network of pseudohyphae in biofilms, Candida species can decrease medication penetration and boost antifungal resistance (Pereira et al., 2020).

The current investigation concurred with Mohammed et al. (2017) who discovered that all C. albicans isolates tested developed biofilm on polystyrene with varying strength.

On the other hand, Deepa et al. (2015), report that biofilm formation was present in 78.9% of Candida isolates, but Mohammadi et al. (2021) noted that biofilm formation was present in 20%, 11.4%, and 21.4% of isolated candida at mild (+), moderate (++), and strong (+++) levels in 54.3% of Candida species. Also, Hussain et al. (2020) found that 2 of isolates were strong and 6 of isolates were moderate.

The PCR assay is a potent approach for identifying various genes, it is quicker, easier, and more accurate (Mohsin and Ali, 2021; Sheet, 2022).

The present result contrasted with the result of Shrief et al. (2019) who examined the virulence genes of C. albicans and found that HWP1 gene represented (77%), SAP1 (65%), and PLB1 (52%). Also, these results are contrasted with Soliman et al. (2020) who discovered that 50% of C. albicans isolates had HWP1 and SAP4, while PLB1 was not detected in tested isolates (0%).

In contrast to this study, Vijayalakshmi et al. (2016) found that the HWP1, SAP1, and PLB1 virulence genes in 77%, 65%, and 52%, respectively, of multi-drug resistant C. albicans. Moreover, HWP1, SAP1, and PLB1 virulence genes were found in 90.9%, 59.09%, and 13.63% of the investigated C. albicans isolates, respectively, by Abdul-Lateef et al. (2015). The number of specimens under analysis and the numerous C. albicans isolation origins are factors that may contribute to the variability in the prevalence percentages of virulence genes as mentioned by (Vijayalakshmi et al., 2016). Abdulla and Ismael (2023) found that HWP1 genes were found in all C. albicans isolated.

Conclusions and Recommendations

The current study discovered that mastitis continues to merit substantial attention for its control and preventions because it is thought to be the most financially burdensome disease. The most common fungi found in caprine mastitis are described in this study, and based on current observations of the higher percentage of fungi isolated from mastitic milk samples, may be due to unsanitary conditions and the development of antibiotic resistance in bacteria, which lengthens the course of treatment and increases the likelihood that fungi like candida will infect as a secondary invader.

This study concluded that poor sanitation and a reduction in goat health and nutrition were to blame for the high morbidity incidence of mycotic mastitis in Iraqi goats, and the C. albicans that isolated from subclinical caprine mastitis made up high ratio of all Candida spp. isolates were high ratio of virulence factors that associated with the pathogenicity and severity of infection.

Additional researches are needed to study other types of virulence factors for C. albicans and other types of Candida spp. that isolated from caprine mastitis.

Acknowledgements

The authors are thankful to all members in the laboratories of Ministry of Science and Technology for their assistance, help and generosity. And many thanks to staff of departments’ Internal and Preventive Veterinary Medicine, college of veterinary medicine, University of Baghdad – Iraq for their support and providing the facilities during the samples processing.

Novelty Statement

There is no data available in Iraq about molecular detection of C. albicans isolated from caprine mastitis and due to the high prevalence of this type of yeast in mastititic cases and its veterinary and economic importance in field animals, the study was conducted to explore the spread of candidal mastitis in goat and identified the species by novel gene accompanied with detection of some virulence genes that associated with pathogenesis of C. albicans

Author’s Contribution

These authors each contributed equally.

Conflict of interest

There are no stated conflicts of interest by the authors.

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