Surgical Site Infections remain stubbornly common, driving 3.3 million additional hospital days worldwide each year. Even after procedures like abdominal hysterectomy and cesarean delivery, pooled SSI incidences of 2.4% and 5.0% respectively translate into far more than just wound problems, including higher mortality, readmissions, and reoperations. As you compare organ or space infections with superficial cases and look at how culture-confirmed pathogens and prevention practices shift outcomes, the variation becomes the real story.
Key Takeaways
- SSIs are among the most common hospital-acquired infections in surgical wards
- 27% of surgical patients with an SSI have infections affecting the organ/space level
- 2.4% incidence of SSI after abdominal hysterectomy reported in a systematic review
- SSI increases the risk of postoperative death; pooled estimates indicate an increased mortality risk (meta-analysis)
- SSI is associated with a 2.5-fold increase in odds of postoperative mortality (meta-analysis estimate)
- SSI is associated with prolonged length of stay; estimates show an additional 7–10 days in many studies
- $28,697 average attributable cost per SSI in one large U.S. study (mean excess cost)
- $2.5 billion to $7.4 billion annual cost range from SSIs across the EU (systematic economic review estimate range)
- SSI-related costs vary by type; deep/organ-space SSIs cost more than superficial incisional SSIs (published comparative analyses)
- Risk of SSI increases with certain patient factors; diabetes prevalence and SSI association quantified in cohort studies (example: pooled OR estimates)
- Obesity (BMI≥30) increases SSI risk; meta-analyses report increased odds ratios compared with normal weight
- Smoking increases SSI risk; meta-analysis reports elevated odds versus nonsmokers
- Positive culture rates for SSIs vary by site; but pooled culture-confirmed SSI proportions are reported in microbiology studies
- Staphylococcus aureus is a leading SSI pathogen in many surgical cohorts (incidence share reported in reviews)
- Coagulase-negative staphylococci are frequently detected in superficial and deep SSIs in prosthetic-related surgeries (review data)
Surgical site infections affect up to 5 percent of common surgeries, extend stays, and greatly raise death risk.
Related reading
01 · Category
Prevalence & Burden9 stats
01
SSIs are among the most common hospital-acquired infections in surgical wards
02
27% of surgical patients with an SSI have infections affecting the organ/space level
03
2.4% incidence of SSI after abdominal hysterectomy reported in a systematic review
04
5.0% pooled SSI incidence after cesarean delivery reported in a systematic review (year of included studies varies by review)
05
7% pooled SSI incidence after spinal surgery reported in a meta-analysis
06
8.6% SSI incidence after coronary artery bypass grafting reported in a prospective study
07
5.3% SSI incidence after abdominal surgery reported in a prospective cohort study
08
SSIs contribute to 3.3 million additional hospital days globally each year (estimate)
09
Up to 25% of patients with SSIs require reoperation (systematic reviews summarize substantial reintervention needs)
Interpretation
Prevalence & Burden Interpretation
From a prevalence and burden perspective, surgical site infections remain a major hospital problem with pooled incidences ranging up to 8.6% after coronary artery bypass grafting and they drive heavy healthcare use, including 3.3 million extra hospital days globally each year and up to 25% of patients needing reoperation.
02 · Category
Clinical Outcomes5 stats
01
SSI increases the risk of postoperative death; pooled estimates indicate an increased mortality risk (meta-analysis)
02
SSI is associated with a 2.5-fold increase in odds of postoperative mortality (meta-analysis estimate)
03
SSI is associated with prolonged length of stay; estimates show an additional 7–10 days in many studies
04
Patients with SSI have higher readmission rates; pooled studies show increased readmissions versus controls (meta-analysis)
05
SSI patients have increased risk of reoperation; systematic review reports substantially higher rates than non-SSI patients
Interpretation
Clinical Outcomes Interpretation
For clinical outcomes, surgical site infection is linked to worse postoperative mortality and care utilization, including a 2.5-fold higher odds of death and an extra 7 to 10 days in hospital stay compared with patients without SSI.
03 · Category
Cost Analysis5 stats
01
$28,697average attributable cost per SSI in one large U.S. study (mean excess cost)
02
$2.5 billion to $7.4 billion annual cost range from SSIs across the EU (systematic economic review estimate range)
03
SSI-related costs vary by type; deep/organ-space SSIs cost more than superficial incisional SSIs (published comparative analyses)
04
In a U.S. claims study, mean total cost was $27,706for SSI cases vs $10,792 for non-SSI controls (difference reflects excess cost)
05
SSI increases hospital charges; one U.S. study reported 2–3 times higher charges for SSI patients (study estimate)
Interpretation
Cost Analysis Interpretation
Across cost analyses, surgical site infections substantially raise financial burden, with excess attributable cost averaging $28,697 per SSI in a major U.S. study and U.S. claims showing mean costs of $27,706 for SSI cases versus $10,792 for non-SSI controls, underscoring why SSIs drive major healthcare spending.
More related reading
04 · Category
Risk Factors & Prevention12 stats
01
Risk of SSI increases with certain patient factors; diabetes prevalence and SSI association quantified in cohort studies (example: pooled OR estimates)
02
Obesity (BMI≥30) increases SSI risk; meta-analyses report increased odds ratios compared with normal weight
03
Smoking increases SSI risk; meta-analysis reports elevated odds versus nonsmokers
04
Preoperative antibiotic prophylaxis reduces SSI risk; meta-analysis supports significant risk reduction versus no prophylaxis/incorrect use
05
Maintaining normothermia reduces SSI risk; meta-analyses show lower SSI rates with active warming
06
Perioperative glycemic control protocols reduce SSI risk in diabetic and non-diabetic surgical populations (systematic review evidence)
07
5 components of the WHO SSI-prevention and surgical safety approach include antibiotic prophylaxis timing, skin antisepsis, and sterile technique (checklist design)
08
Chlorhexidine bathing reduces healthcare-associated infections; evidence supports fewer SSIs as part of broader infection prevention (systematic review)
09
Use of antimicrobial sutures reduces SSI risk compared with standard sutures (meta-analysis estimate)
10
Negative pressure wound therapy reduces SSI risk in closed incisions; meta-analyses report reduced SSI rates in high-risk surgeries
11
Use of antibiotic-impregnated dressings shows reduced SSI risk versus standard dressings in clinical trials/meta-analyses (reported relative reductions)
12
Screening and decolonization for Staphylococcus aureus (e.g., MRSA) reduces surgical site infections in covered settings; systematic review evidence supports reduction
Interpretation
Risk Factors & Prevention Interpretation
Across Risk Factors and Prevention, the strongest and most consistent trend is that modifiable care steps can meaningfully cut SSI risk, with pooled evidence showing preoperative antibiotic prophylaxis, active normothermia, and structured glycemic control all lowering infections while patient risks such as obesity and smoking raise them.
05 · Category
Microbiology & Pathogens12 stats
01
Positive culture rates for SSIs vary by site; but pooled culture-confirmed SSI proportions are reported in microbiology studies
02
Staphylococcus aureus is a leading SSI pathogen in many surgical cohorts (incidence share reported in reviews)
03
Coagulase-negative staphylococci are frequently detected in superficial and deep SSIs in prosthetic-related surgeries (review data)
04
Gram-negative organisms contribute to a substantial fraction of SSIs, especially abdominal/colorectal surgery (microbial review synthesis)
05
Enterococcus species are reported among common pathogens in colorectal and abdominal SSIs (reviewed proportions)
06
MRSA is detected in a subset of SSIs; pooled MRSA proportions are reported in surveillance reviews (meta-analysis)
07
E. coli accounts for a meaningful proportion of gram-negative SSIs in abdominal/urinary tract–related surgical infections (review reports share)
08
Enterobacteriaceae are common in culture-positive SSIs after gastrointestinal surgery (surveillance synthesis)
09
Pseudomonas aeruginosa is an important pathogen in certain high-risk wound/implant-related SSIs (review evidence)
10
Polymicrobial infections occur in a significant fraction of SSIs, especially in contaminated surgeries (systematic review evidence)
11
Culture-positive SSIs often involve skin flora such as S. aureus and coagulase-negative staphylococci (microbiologic reviews)
12
CDC estimates MRSA causes more than 100,000 invasive infections annually in the U.S. (background for MRSA burden relevant to SSIs)
Interpretation
Microbiology & Pathogens Interpretation
Across microbiology and pathogen studies, culture-confirmed SSIs are often driven by common Gram positive skin organisms like Staphylococcus aureus and coagulase negative staphylococci as well as meaningful Gram negative and Enterococcus contributions, and MRSA is present in a measurable subset of cases alongside the broader burden of more than 100,000 invasive MRSA infections annually in the US.
06 · Category
Surveillance & Reporting3 stats
01
CDC’s NHSN reports standardized SSI definitions for surveillance used across facilities in the U.S. (standardization impact quantified by adoption of NHSN)
02
The NHSN ‘Surgical Site Infection’ component is part of NHSN acute care hospital surveillance (program documentation)
03
CMS reports SSI (e.g., colon surgery) as publicly available quality measures (public reporting documentation)
Interpretation
Surveillance & Reporting Interpretation
Across Surveillance and Reporting, the U.S. is moving toward more comparable SSI monitoring because CDC’s NHSN standardizes SSI surveillance definitions that facilities adopt for acute care reporting, and CMS then turns results such as colon surgery into publicly reported quality measures.
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Timothy Grant. (2026, February 13). Surgical Site Infection Statistics. Gitnux. https://gitnux.org/surgical-site-infection-statistics
MLA
Timothy Grant. "Surgical Site Infection Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/surgical-site-infection-statistics.
Chicago
Timothy Grant. 2026. "Surgical Site Infection Statistics." Gitnux. https://gitnux.org/surgical-site-infection-statistics.
Sources & references
46 datasets cited across this report · attribution is report-level
+41 additional datasets cited (not shown individually)