Studying the Distribution of Accessory Gene Regulator (Agr) Quorum Sensing System and the Prevalence of Linezolid and Mupirocin Resistance in Biofilm Producer/Non Producer Staphylococcus Aureus in Sohag University Hospitals

NCT ID: NCT06291181

Last Updated: 2024-03-04

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 265 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-01-01
• Study Completion Date: 2023-06-30

Brief Summary

Staphylococcus aureus is an important pathogen causing a wide spectrum of infections . The organism usually colonizes the skin and mucous of humans and several animal species. Multiple body sites can be colonized in humans, however, the anterior nares of the nose are the most frequent carriage site for S. aureus. Other sites for carriage include the skin, perineum, and pharynx . It has been shown that there is an increased prevalence of staphylococcus infections, which may be attributed to its carriage in anterior nares and hands of health care workers and patients .

The pathogenic mechanisms enabling S. aureus to cause serious infections could include: biofilm which protects organisms from host immune response; opsonophagocytosis and antimicrobial agents, thus leading to chronic and persistent infections.

Antibiotic resistance associated with S.aureus infections is a great concern for the clinicians to prevent spread of infections. Methicillin was commonly used for these infections before the emergence of MRSA which is developed due to irrational use of antibiotics, prolonged hospital stay, nasal and hand carriage in health care staff. Also vancomycin, linezolid and mupirocin are used in treating infections,as well as decolonization of carriers .

Mupirocin act by inhibiting the protein synthesis of bacteria by binding specifically to isoleucyl-tRNAsynthetase enzyme. The irrational use of Mupirocin among patients and its carriage in health care staff has led to the emergence of resistance to this antibiotic. .

MupA, plasmid mediated gene, has a great role in mupirocinresistence as it had a supplementary modified isoleucyltRNAsynthetase which leads to the high level resistance to Mupirocin. The mupA gene has the ability to facilitate and disseminate the resistance mechanism in different patterns .

Linezolid,thefirstoxazolidinonedrug,waslaunchedin2001andis still displaying excellent in vitro activity against Staphylococcus epidermidis on a global scale,although outbreaks of linezolidresistant S. epidermidis (LRSE) are occasionally reported..

Linezolid resistance is mediated by, mutations in the 23S rRNA gene, altering the drug-binding site, and/or the 50S ribosomal proteins L3, L4 and L22, impairing linezolid binding;,Oracquisition of the primarily plasmid-encoded genes cfr, encoding a methyltransferase, or optrA, encoding an ABC transporter, or the cfr homologues cfr(B) and cfr(C).

While cfr can mediate the PhLOPSA phenotype (resistance to phenicols, lincosamides,oxazolidinones, pleuromutilins and streptogramin A compounds), optrA confers oxazolidinone and phenicolresistance only..

Pathogenecity of S. aureus is regulated by various factors ,one of them is the accessory gene regulatory (agr) system. It consists of 2 divergently transcribed loci (3 kb) controlled by means of 2 promoters P2 and P3. Most of clinical isolates of acute infections have a functional agr system and all, like strains, produce RNAIII in vitro and in vivo.

Agr deficiency has been related to increased biofilm formation because RNAIII reduces the expression of surface adhesins and increases the production of capsule, toxins, and proteases. The agr system is supposed to regulate over 70 genes, 23 of which are renowned virulence factors.

There are 2 classes of virulence factors regulated by agr. The first class includes virulence factors implicated in attachment to the host and immune evasion, whereas the second class contains genes engaged in the production of exoproteins related to invasion and toxin production . The activation of the agr system switches the bacterium from an adhesive, colonizing commensal into an invasive and aggressive pathogen(Roux A et al; 2009).

Major virulence factors in S. aureus, exfoliative toxins (ETs), toxic shock syndrome toxin (TSST-1), and staphylococcal enterotoxins (SEs) are involved in host colonization, invasion of damaged skin and mucus, gastrointestinal infection, and prevarication of host defense mechanisms. Indeed, agr operon including agrA, agrB, agrC, and agrD genes regulate over 70 genes in S. aureus 23 of which control its pathogenicity and invasive infections .

Moreover, S. aureus can be stratified into 4 different groups (agr I, agr II, agr III, and agr IV) according to the sequences of agrC (auto inducing peptide) and agrD (cyclic AIP) genes. It is stated that agr types are different in their properties and prevalence in various geographical areas thus, identification of predominant types in each region may well be functional .

Conditions

Staphylococcus Aureus

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: SUPPORTIVE_CARE
• Blinding Strategy: NONE

Study Groups

cases group

wound infected patients

Group Type: EXPERIMENTAL

antibiotic sensitivity test

Intervention Type: DIAGNOSTIC_TEST

Disc diffusion method using modified Kirby-Bauer technique on Muller Hinton agar (MHA) will be carried out for antimicrobial susceptibility of S. aureus isolates. The following antibiotics will be tested: cefoxitin (30 µg ), Tetracyclin 30 µg (TE), Chloramphenicol 30 µg (C), Gentamycin 10µg (CN), Erythromycin 15µg(E),Clindamycin 2 µg (DA), Ciprofloxacin 5 µg (CIP), Trimethoprim/sulphamethoxazole 1.25/23.75 µg (SXT), Rifampin 5µg (RA), Linezolide 30µg (LZD); cefoxitin disc (FOX 30 g)

zone diameters interpretation will be done according to Clinical and Laboratory Standard Institute (CLSI 2018),

Interventions

antibiotic sensitivity test

Disc diffusion method using modified Kirby-Bauer technique on Muller Hinton agar (MHA) will be carried out for antimicrobial susceptibility of S. aureus isolates. The following antibiotics will be tested: cefoxitin (30 µg ), Tetracyclin 30 µg (TE), Chloramphenicol 30 µg (C), Gentamycin 10µg (CN), Erythromycin 15µg(E),Clindamycin 2 µg (DA), Ciprofloxacin 5 µg (CIP), Trimethoprim/sulphamethoxazole 1.25/23.75 µg (SXT), Rifampin 5µg (RA), Linezolide 30µg (LZD); cefoxitin disc (FOX 30 g)

zone diameters interpretation will be done according to Clinical and Laboratory Standard Institute (CLSI 2018),

Intervention Type: DIAGNOSTIC_TEST

Eligibility Criteria

Inclusion Criteria

• patients with signs of wound infection like pus or exudate

Exclusion Criteria

• burns with greenish discharge and wounds with fungal infection

• Minimum Eligible Age: 3 Years
• Maximum Eligible Age: 70 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Sohag University

OTHER

Sponsor Role: lead

Responsible Party

Marwa Mohamed Bakry

assistant specialist at fever hospital

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

Sohag university Hospital

Sohag, , Egypt

Countries

Egypt

References

Anderson DJ, Kaye KS. Staphylococcal surgical site infections. Infect Dis Clin North Am. 2009 Mar;23(1):53-72. doi: 10.1016/j.idc.2008.10.004.

Reference Type: BACKGROUND

PMID: 19135916 (View on PubMed)

Anderson DJ, Podgorny K, Berrios-Torres SI, Bratzler DW, Dellinger EP, Greene L, Nyquist AC, Saiman L, Yokoe DS, Maragakis LL, Kaye KS. Strategies to prevent surgical site infections in acute care hospitals: 2014 update. Infect Control Hosp Epidemiol. 2014 Sep;35 Suppl 2:S66-88. doi: 10.1017/s0899823x00193869. No abstract available.

Reference Type: BACKGROUND

PMID: 25376070 (View on PubMed)

Arciola CR, Baldassarri L, Montanaro L. Presence of icaA and icaD genes and slime production in a collection of staphylococcal strains from catheter-associated infections. J Clin Microbiol. 2001 Jun;39(6):2151-6. doi: 10.1128/JCM.39.6.2151-2156.2001.

Reference Type: BACKGROUND

PMID: 11376050 (View on PubMed)

Other Identifiers

Soh-Med-24-01-05MD

Identifier Type: -

Identifier Source: org_study_id