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Epidemiology and antimicrobial susceptibility of Staphylococcus aureus in children in a tertiary care pediatric hospital in Milan, Italy, 2017—2021
Italian Journal of Pediatrics volume 48, Article number: 67 (2022)
Methicillin-resistant Staphylococcus aureus (MRSA) is highly prevalent worldwide and can cause severe diseases. MRSA is associated with other antibiotic resistance. COVID-19 pandemic increased antimicrobial resistance in adult patients. Only a few data report the antimicrobial susceptibility of S. aureus in the Italian pediatric population, before and during the COVID-19 pandemic.
We included all the S. aureus positive samples with an available antibiogram isolated from pediatric patients (< 18 years old) in a tertiary care hospital in Milan, Italy, from January 2017 to December 2021. We collected data on demographics, antimicrobial susceptibility, and clinical history. We compared methicillin-susceptible Staphylococcus aureus (MSSA) and MRSA strains. We calculated the frequency of isolation by year. The incidence of isolates during 2020 was compared with the average year isolation frequency using the univariate Poisson test. We compared the proportion of MRSA isolates during 2020 to the average proportion of other years with the Chi-squared test.
Our dataset included a total of 255 S. aureus isolated from 226 patients, 120 (53%) males, and 106 (47%) females, with a median age of 3.4 years (IQR 0.8 – 10.5). The mean isolation frequency per year was 51. We observed a significant decrease of isolations during 2020 (p = 0.02), but after adjusting for the total number of hospitalization per year there was no evidence that the incidence changed. Seventy-six (30%) S. aureus were MRSA. Twenty (26%) MRSA vs 23 (13%) MSSA (p = 0.02) were hospital-acquired. MRSA strains showed higher resistance to cotrimoxazole, clindamycin, macrolides, levofloxacin, gentamicin, and tetracyclin than MSSA strains. None of MRSA were resistant to linezolid and vancomycin, one was resistant to daptomycin. The proportion of MRSA did not change during the COVID-19 pandemic. The overall clindamycin resistance was high (17%). Recent antibiotic therapy was related to MRSA infection.
The proportion of MRSA did not change during the COVID-19 pandemic and remained high. Clindamycin should not be used as an empirical MRSA treatment due to its high resistance.
Staphylococcus aureus is a major source of disease ranging from soft-tissue infections (SSTIs) to bacteremia, associated with substantial morbidity and mortality in hospital settings and communities and also affecting children [1, 2].
Methicillin-resistant S.aureus (MRSA) strains are highly prevalent, and have traditionally been confined to individuals with frailty such as recent hospitalization or health-care utilization, residence in long-term care units, hemodialysis, indwelling percutaneous medical device and catheters [3, 4].
However, cases of infections caused by MRSA have also been documented among healthy community members, particularly among children without established risk factors for MRSA acquisition. These infections are mostly acquired in the community and have been referred to as community-associated MRSA infections (CA-MRSA) [5, 6].
CA-MRSA are mainly responsible for skin and soft tissue infections such as cellulitis or abscess. Health care-associated MRSA (HCA-MRSA) and hospital-acquired MRSA (HA-MRSA) share similar characteristics  and predominantly cause pneumonia, sepsis, or serious conditions [7, 8].
The prevalence of MRSA strains has not been adequately quantified in many countries, including Italy, especially in children [9, 10]. Limited data compared different patterns of antibiotic resistance complicated by the limited number of effective antibiotics analyzed in children . In addition, recurrent infections, common in children, can change antibiotic sensitivity .
The guidelines highlight the necessity of using different antibiotic empiric therapies depending on the local prevalence of resistance pattern [13, 14], but the general inadequate knowledge makes complex the management of MRSA.
Knowledge of local antibiotic resistance patterns represents a major challenge in the management of MRSA infection, also considering that antibiotic control in children may affect antibiotic resistance in adults [15, 16].
The COVID-19 pandemic increased antimicrobial resistance in adult patients, mainly due to inappropriate antibiotic prescription . A single-centre study in a pediatric tertiary care hospital in London, United Kingdom, found an increase in crude antibiotic consumption during the COVID-19 pandemic, but the association disappeared after adjusting for case-mix . Moreover, the extensive use of telehealth , social distancing, and school closure could have led to a decrease in the transmission of bacterial infections  with the consequent low antibiotic prescription rate in primary care.
The present investigation considers the demographic and clinical features of patients with MRSA and the corresponding antimicrobial pattern before and during the COVID-19 pandemic in a pediatric tertiary hospital, which functioned as a hub for SARS-CoV-2 positive patients.
Data source and study design
We performed an observational study at a tertiary care hospital (IRCCS Fondazione Cà Granda Ospedale Maggiore Policlinico), in Milan, northern Italy, from January 2017 to December 2021.
We included all the S. aureus positive samples for which an antibiogram was performed gathered in the microbiology electronic record, isolated from pediatric patients (< 18 years old). We collected data on age, sex, antimicrobial susceptibility, medical history, clinical course, and hospitalization days. S. aureus isolated after 48 h of hospitalization were considered hospital-acquired, those isolated from patients receiving hemodialysis, chemotherapy, and recent (within 30 days) surgery or exposure to health care were considered health care-associated, the others community-acquired.
The Milano Area 2 Ethical Committee approved the study, which included a waiver of informed consent because of the retrospective nature of the investigation.
The samples were collected from blood cultures, skin, nose, oropharyngeal, ear, conjunctival, preputial, wound, exudate, and rectal swabs, lymph node, fistula fluid, synovial fluid, peritoneal fluid, bone samples, and urine samples gathered from the stoma, urine bag or sterile collection cups.
Traditional culture and susceptibility testing took between 48 and 72 h, including a 16 to 24 h incubation and another 16 to 24 h to complete the susceptibility tests. Pathogen identification was confirmed by MALDI-TOF MS technology performed using VITEK® MS Plus (Biomerieux SA).
Antimicrobial susceptibility for antibiotics including cefoxitin, clindamycin, cotrimoxazole, linezolid, tetracycline, macrolides, daptomycin, levofloxacin, fusidic acid, mupirocin, gentamycin, and vancomycin was assessed using a specific card for Gram-positive bacteria analyzed with automated instrument Vitek 2 (Biomerieux SA). Cefoxitin (cefoxitin screening) is a very sensitive and specific marker of mecA/mecC-mediated methicillin resistance and is the antibiotic of choice to define the MRSA strain.
The Gram staining technique was only performed for positive blood cultures, to discriminate between Gram + and – in a short period to start a targeted therapy as soon as possible.
When blood culture was positive, in clinically suspected cases requested by the pediatrician, we used the molecular methods IDI-MRSA kit on a Smart Cycler II thermal cycler instrument (Cepheid, Sunnyvale, Calif., USA) or Xpert® MRSA/SA Blood Culture on GeneXpert instrument (Cepheid, Sunnyvale, Calif., USA) to distinguish MRSA strains from methicillin-susceptible Staphylococcus aureus (MSSA).
Continuous data are presented as median and interquartile range. We compared MSSA and MRSA strains. The chi-square test or Fisher’s exact test were used for categorical variables, the Mann–Whitney U-test for continuous ones. The incidence of isolations during 2020 was compared with the average year isolation frequency using the univariate Poisson test. We compared the proportion of MRSA isolations during 2020 with the average proportion of other years with the Chi-squared test. Statistical significance was considered as a p-value < 0.05. Statistical analysis was performed using R software (version 3.6.3 for Windows).
Our dataset included a total of 255 S. aureus isolated from 226 patients, 120 (53%) male, and 106 (47%) female, with a median age at the isolation of 3.4 years (IQR 0.8 – 10.5). Overall, 147 (58%) S. aureus were cultured from SSTIs, 48 (19%) from upper respiratory tract infections (URTIs), 35 (14%) from bloodstream infections, 10 (4%) from acute conjunctivitis, 6 (2%) from urinary tract infections (UTIs), 5 (2%) from osteoarticular infections and 4 (2%) from infections in other sterile sites. Forty-three (17%) samples were obtained after two days of hospitalization, 59 (23%) were health care-associated infections, while the remaining 153 (60%) were considered community-acquired. The mean isolation frequency per year was 51. We isolated 41 (16%) S. aureus in 2017, 65 (25%) in 2018, 50 (20%) in 2019, 36 (14%) in 2020 and 63 (25%) in 2021. We observed a significant decrease in absolute isolation during 2020 (p = 0.02). However, when the number of isolations per year was adjusted for the total number of hospitalizations during the same year, 2228 during 2020 versus an average hospitalization per year of 2994, we found a proportion of 16:1000 during 2020 versus an average of 17:1000.
We identified a predisposing factor in 92 (36%) cases. The most prevalent factor in our cohort was central venous catheter (n = 22), followed by trauma (n = 15), peripheral venous catheter (n = 9) and surgical intervention (n = 9). In 95 (34%) cases there was at least a chronic disease. The most prevalent was epidermolysis bullosa (n = 23), followed by neurologic diseases (n = 15), atopic dermatitis (n = 13), kidney diseases (n = 13) and metabolic diseases (n = 6). Patients with chronic illness had significantly higher proportions of health care-associated infections (56%) compared to other patients (4%, p < 0.01). There was no significant difference in the proportions of hospital-acquired infections (19% vs 16%).
Fifty-eight (23%) cases had a coinfection. Sixty-nine (27%) cases had a positive anamnesis for recent antibiotic use, 2 (1%) for antibiotic prophylaxis. The most frequently used antibiotics were amoxicillin and clavulanic acid (n = 40) followed by ampicillin (n = 5), ceftriaxone (n = 5) and azithromycin (n = 4). The median value of the maximal C reactive protein (CRP) measured during hospitalization was 1.85 mg/dl (IQR 0.3 – 5.8). The median length of hospital stay was 11 days (IQR 7 – 19). Comparing the patients with positive versus negative anamnesis for recent antibiotic use, there were no differences between the median age (3.3 and 3.3 years), maximal CRP in mg/dl (2 and 1.5 respectively), and days of hospitalization (14 and 10 respectively). Eighteen (45%) of the 40 cases with a positive anamnesis for recent amoxicillin-clavulanic acid use had an MRSA infection, the proportion being significantly higher than the other cases (p = 0.02).
Seventy-six (30%) S. aureus were MRSA. Table 1 summarizes the antimicrobial susceptibility pattern.
Twenty (26%) MRSA versus 23 (13%) MSSA (p = 0.02) were hospital-acquired, 17 (22%) MRSA versus 42 (23%) MSSA were health care-associated (p = 0.9). Compared to MSSA, MRSA infections presented significant higher proportions of positive anamnesis for recent antibiotic use (40% vs 25%, p = 0.01) and higher median value of maximal CRP (3.6 mg/dl, IQR 0.9 – 5.7, vs 1.1, IQR 0.2 – 5.9, p = 0.045). We did not observe other significant differences in demographic, clinical characteristics and site of infection between MRSA and MSSA Table 2.
There was higher resistance of MRSA versus MSSA to cotrimoxazole (22% vs 6%), clindamycin (24% vs 14%), macrolides (37% vs 17%), levofloxacin (46% vs 6%), fusidic acid (34% vs 6%), gentamicin (33% vs 6%), and tetracyclin (20% vs 4%). None of MRSA were resistant to linezolid and vancomycin, one was resistant to daptomycin. Table 3 shows the antimicrobial resistance pattern of MRSA and MSSA.
The proportion of MRSA by year was highest (36.5%) in 2017 and lowest (19.4%) in 2020, with intermediate values of 30.8%, 30.2% and 30% in 2018, 2021 and 2019 respectively. The difference was not significant (p = 0.1). The 2020 cases did not have significant difference in the proportion of chronic conditions (42% vs 36%, p = 0.6) compared with the others 4 years cases, and in the site of infection with 55% vs 58% SSTIs (p = 0.8), 14% vs 14% bloodstream infections (p = 1), 11% vs 20% URTIs (p = 0.2), 3% vs 2% osteoarticular infections (p = 0.5), 6% vs 2% UTIs (p = 0.2) and 6% vs 4% acute conjunctivitis (p = 0.6).
To our knowledge, this is the first Italian study to determine the S. aureus antimicrobial susceptibility and the prevalence of MRSA in a pediatric hospital setting. We found a high proportion of MRSA (30%). The prevalence of MRSA is similar to that reported in an Italian study on the adult population (33.6%)  and to the one recently estimated by the Antimicrobial Resistance Collaborators in Italy in 2019 (between 30 and 40%) , but higher than the one reported in a Turkish pediatric study (18.2%) . The stable trend in the proportion of MRSA in our pediatric sample is consistent with the stable/increasing trend in the Italian general population (from 34.1% in 2015 to 35.6% in 2019) reported by the European Centre for Disease Prevention and Control (ECDC) in the Annual Epidemiological Report for 2019 .
MRSA strains showed a significantly increased resistance to cotrimoxazole, clindamycin, macrolides, levofloxacin, gentamicin, and tetracyclin than MSSA strains. These results are consistent with data in the adult population, which reported that MRSA strains were more resistant to all antibiotics except for doxycycline  and significantly more resistant to ciprofloxacin, clindamycin, erythromycin, rifampicin, and tetracycline . We reported a high overall prevalence of clindamycin resistance (17%). Accordingly, clindamycin should not be used for empirical MRSA treatment, in line with the 10% limit indicated in the Clinical Practice Guidelines by the Infectious Diseases Society of America . As far as the intravenous route, we did not find S. aureus resistant to vancomycin and linezolid, and only one MRSA strain resistant to daptomycin. Therefore, these antibiotics should be used in severe infections as indicated in the above-quoted guidelines . We reported a low prevalence of mupirocin resistance (5%), consistent with a Brazilian study that found a 1.1% resistance . In contrast with the aforementioned study that reported a low prevalence of fusidic acid resistance (5.9%) , we found a higher proportion of resistant strains (14%). Topical mupirocin can thus be used for children with minor skin infections and secondarily infected skin lesions .
The World Health Organization (WHO) indicates surveillance as the core pillar in the global action plan on microbial resistance . A critical factor associated with MRSA is the quality of prescribed antibiotics, especially considering their spectrum of activity . Antibiotics are the most frequently prescribed drug in children  with a high rate of inappropriate prescription . Efforts should focus on decreasing broad-spectrum antibiotic use for common diseases . Italy has one of the highest rates of antibiotic use in the pediatric population among high-income countries, and the prescriptions pattern is dominated by broad-spectrum agents . Despite the diffusion of national clinical guidelines, inappropriate antibiotic prescriptions for common diseases such as acute otitis media and bronchiolitis remain frequent [33, 34]. The MAREA study monitored the adherence to guidelines of antibiotic use in pediatric pneumonia in Liguria, North-West Italy, finding a global adherence to guidelines in 45% of cases and 61% of patients receiving multidrug empirical regimens. The adherence to guidelines improved after a 1 day-educational intervention on pediatricians . We reported a relation between a positive anamnesis for recent antibiotic use and MRSA infections, and the relation was even stronger when we considered amoxicillin-clavulanic acid use. In our sample, the most common antibiotics were broad spectrum such as amoxicillin-clavulanate, ampicillin, ceftriaxone, and azithromycin. Anyway, our data do not allow us to assess the appropriateness of prescriptions.
The total number of S. aureus isolations significantly decreased during 2020, but after adjusting for the total number of hospitalization per year there was no evidence that the incidence changed. The drop in hospitalizations is due to the increased use of telehealth  and the substantial decrease in pediatric hospitalizations for many acute conditions, such as bronchiolitis and asthma, during the first and second wave of the COVID-19 pandemic [36, 37]. The role of predisposition in colonized patients, environmental factors, and antibiotic pressure in S. aureus hospital and household transmission is not fully understood , although the household environment plays a key role in MRSA transmission . Next-generation sequencing and whole genomic sequencing are promising methods for the control of nosocomial infections [38, 40].
Since we performed a retrospective analysis focusing on strains originating from a single-center, it was not possible to differentiate infections from colonization. Moreover, we had a high prevalence of epidermolysis bullosa patients, since our facility is a referral center for this rare genodermatosis. A strength of our work is a relatively large dataset and the uniform and comparative analytic approach.
Surveillance of antimicrobial resistance is essential to improve infection control, antibiotic prescriptions, and preventions policies [21, 27]. Our results did not show changes in MRSA proportions during the COVID-19 pandemic. The proportion of MRSA remains high. In our context, clindamycin should not be used as an empirical MRSA treatment due to its high resistance . Recent antibiotic use was associated with higher proportions of MRSA infections. The efforts should focus on decreasing broad-spectrum antibiotic use for common diseases.
Availability of data and materials
Data are available at the corresponding author upon reasonable request.
Coronavirus disease 19
C reactive protein
European Centre for Disease Prevention and Control
Methicillin-resistant Staphylococcus aureus
Methicillin-susceptible Staphylococcus aureus
Soft tissue infections
Upper respiratory tract infections
Urinary tract infections
World Health Organization
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The Institutional Ethical Committee (Milano Area 2) approved the study. Due to the retrospective nature of the study, the consent to participate was waived.
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La Vecchia, A., Ippolito, G., Taccani, V. et al. Epidemiology and antimicrobial susceptibility of Staphylococcus aureus in children in a tertiary care pediatric hospital in Milan, Italy, 2017—2021. Ital J Pediatr 48, 67 (2022). https://doi.org/10.1186/s13052-022-01262-1
- Staphylococcus aureus
- Antimicrobial susceptibility
- Public health
- COVID-19 pandemic