Are Cloth Scrub Caps Hygienic? The Infection-Control Evidence
Yes. Peer-reviewed studies show cloth scrub caps are at least as safe as disposable bouffants for surgical site infection, shed fewer airborne particles, and stay hygienic when laundered correctly. The evidence points to laundering standards, not the fabric itself, as what determines infection risk.
Last updated: 10 June 2026
The studies at a glance
Every study below is documented in the Medicus Caps evidence library. Together they form the strongest case for properly managed reusable headwear.
| Study | Year | Sample / method | Key finding |
|---|---|---|---|
| Markel et al., Journal of the American College of Surgeons | 2017 | Mock-surgery comparison of cloth skull caps vs disposable bouffants | Disposable bouffants showed higher permeability, particulate contamination and microbial shedding than cloth skull caps. |
| Haskins et al., Hernia | 2017 | Clinical outcomes analysis | No link found between the type of surgical hat worn and postoperative wound events. |
| Hussain et al., Neurosurgery (Vol 82, Issue 4) | 2018 | Class I (clean) surgical cases | Switching from surgical skull caps to bouffant caps did not reduce surgical site infections. |
| Kothari et al., Journal of the American College of Surgeons | 2018 | 1,543 patients (bouffant in 39%, skull cap in 61%) | Raw SSI rates were 8% (bouffant) vs 5% (skull cap), but after adjusting for procedure type no significant difference remained. |
| Nyima et al., Surgical Research | 2024 | Rapid review of cloth vs disposable headwear | No evidence that disposable bouffant caps reduce SSIs versus properly laundered cloth caps; cloth caps showed advantages in communication, cost and environmental impact. |
| Gumera et al., Journal of Hospital Infection | 2024 | Systematic review and meta-analysis, 9 studies, 45,708 cases | No significant difference in SSI rates between reusable and disposable headwear (OR 0.79; 95% CI 0.59–1.07; P = 0.13), with significantly lower carbon footprint and environmental impact for reusables (all P < 0.005). |
| Hughes et al., Patient Safety in Surgery | 2026 | Direct bacterial colonisation comparison across 107 theatre personnel | Cloth caps carried more bacteria than disposables (mean 5.16 vs 1.06 colony-forming units; growth rank 0.93 vs 0.20, P < 0.001). Authors concluded the issue is proper sterilisation of cloth caps, not the material itself. |
| Bartek et al., Clinical Infectious Diseases (original data Hill et al., The Lancet, 1974) | 2017 | Review of decades of bacterial dispersal research | Fabric friction launches bacteria-laden skin cells into the air; weave density and fit determine how many become airborne, making tightly woven fabric a contamination-control decision. |
| O'Connor et al., Orthopedic Nursing | 2026 | Systematic review of 538 studies (8 met inclusion criteria) on facial-hair coverage | No statistically significant difference in SSI rates between covered and uncovered facial hair — underlining how thin the evidence base is for several headwear assumptions. |
What the evidence actually shows
Read together, these studies make three things clear. First, no high-quality study shows disposable bouffants reduce surgical site infections compared with cloth caps. The largest analysis to date — Gumera et al.'s meta-analysis of 45,708 cases — found no significant difference in SSI rates, with the confidence interval actually favouring reusables.
Second, the physics favour a well-made cloth cap. Markel et al. found disposable bouffants were more permeable and shed more particles than tightly woven cloth skull caps. Because every person in theatre sheds roughly 200 million skin cells an hour — about a tenth carrying viable bacteria — a snug, tightly woven cap that contains those particles is doing real contamination-control work.
Third, and most importantly, hygiene depends on laundering. The 2026 Hughes study found cloth caps carried more bacteria than disposables in everyday use — but the authors were explicit that the answer is proper sterilisation of cloth caps, not abandoning them. A cloth cap is only as clean as its last wash.
The washing protocol that keeps cloth caps compliant
NHS England's uniforms and workwear guidance (updated 2 April 2020), drawing on 2007 research, sets out what a compliant wash looks like:
- Washing with detergent at 30°C removes most Gram-positive micro-organisms, including MRSA.
- A ten-minute wash at 60°C is sufficient to remove almost all micro-organisms — in tests, only 0.1% of any Clostridioides difficile spores remained, a level microbiologists judge is not a cause for concern.
- There is little effective difference between domestic and commercial laundering for removing micro-organisms, so home washing at 60°C is a legitimate option.
In practice, that means washing your cap after every shift or case in high-risk areas such as operating theatres and ICUs, owning several caps so a clean one is always ready, and keeping used caps separate from clean ones in a dedicated laundry bag. Our full care guide covers drying and ironing in detail.
What infection-control teams ask
Are reusable cloth caps allowed under NHS guidance?
Yes. NHS England's workwear guidance requires theatre staff to cover hair to keep it out of the sterile field, and confirms that home laundering at 60°C is as effective as commercial laundering at removing micro-organisms. The guidance is about clean, properly laundered headwear — not about banning reusables.
Do cloth caps cause more surgical site infections?
The evidence says no. Multiple studies (Haskins 2017, Hussain 2018, Kothari 2018) found no significant SSI difference by cap type, and the 2024 Gumera meta-analysis of 45,708 cases confirmed reusables match disposables for SSI rates.
If cloth caps can carry more bacteria, how can they be hygienic?
The 2026 Hughes study did record higher bacterial loads on cloth caps in everyday use — but its conclusion was that this reflects laundering practice, not the fabric. A cap washed at 60°C after every shift removes almost all micro-organisms. Hygiene is a function of the wash cycle, not the material.
Should our department mandate disposable-only?
The research does not support disposable-only policies on infection-control grounds. Gumera et al. found policy choice did not affect SSI rates (OR 1.21; 95% CI 0.85–1.73; P = 0.30), while reusables delivered significantly lower carbon footprint and environmental impact. The more defensible policy is robust laundering standards.
What the evidence does not show (the honest limitations)
To stay credible, it is worth being clear about what these studies do not prove. They do not show that cloth caps actively lower SSI rates — the consistent finding is no significant difference, not cloth superiority for infections. The Markel particle-shedding advantage was measured in mock surgery, not patient outcomes. The 2026 Hughes study is a genuine caution: unwashed or poorly laundered cloth caps can carry more bacteria than a fresh disposable, so the benefit is conditional on compliance. And the O'Connor beard-cover review reminds us that several long-standing headwear assumptions rest on thin evidence. The honest summary: a well-made cloth cap, washed properly, is at least as safe as a disposable and sheds fewer particles — but the laundering is doing the heavy lifting.
Equipping a department?
If your team is reviewing its headwear policy, the simplest next step is to trial the real thing. Order a bulk-order sample box to assess fit and fabric, or read our bulk and wholesale guide for NHS-to-worldwide ordering. For everyday questions, see our scrub cap FAQs.
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