Terminal Disinfection Definition
What is terminal disinfection?
Terminal disinfection is the thorough disinfection of a place and the items in it after the source of infection has left. In practice that means after a patient is discharged, transferred or dies, and the goal is that no pathogens remain. It differs from the "disinfection at any time" (ongoing disinfection) done while the patient is still there.
Approach: I found no definition of the term in the biocides, disinfectant-registration or infection-control datasets I searched (Swiss, Swedish, German and Chinese sources included). So the definitions below come from official public-health pages I opened.
How official sources define it
- COVID-19 protocol (China's National Health Commission, English version on WHO's website): "Terminal disinfection refers to the thorough disinfection after the source of infection has left relevant sites, and it should be ensured that the places and the items going through terminal disinfection should no longer have pathogens." (Annex 5, Technical Protocol for Site-specific Disinfection, p. 2)
- What it covers: the patient's contaminants (blood, secretions, vomitus, faeces) and items and places that may be contaminated.
- When it is done in medical institutions:
- at the end of each working day in fever and infectious-disease outpatient clinics
- in isolation wards
- after a patient is discharged or dies
- after an asymptomatic case's nucleic acid test turns negative
- Surfaces covered: floors, walls, furniture, bedding, medical supplies and indoor air.
- What it leaves out: large-scale disinfection of the outdoor environment is not needed. Places where asymptomatic cases stayed only briefly, with no obvious contamination, do not need it either.
- Procedure: follows Appendix A of China's national standard GB 19193-2015 (General Principles of Disinfection of Epidemic Focus).
- US CDC ("terminal cleaning"): "Cleaning and disinfection after the patient is discharged or transferred. Includes the removal of organic material and significant reduction and elimination of microbial contamination." The CDC contrasts this with "routine cleaning", which is done while the room is occupied. (CDC Key Definitions)
- NHS Scotland ("terminal decontamination" or "terminal clean"): "the decontamination (including cleaning and disinfection) of an entire room or area during or after use". It "should be carried out for patients or service users with known or suspected infectious status and upon the cessation of an outbreak." (National Infection Prevention and Control Manual glossary)
Points to note
- The sources use different names for the same idea: "terminal disinfection" in the Chinese/WHO protocol, "terminal cleaning" at the CDC, and "terminal decontamination" in NHS Scotland. The US and UK terms explicitly include cleaning as well as disinfection.
- The NHS Scotland definition is broader: it allows terminal decontamination "during or after use" and ties it to the end of an outbreak, not only to a patient leaving.
If you're asking because of a product claim, I can check how a disinfectant for terminal or room disinfection would be classified as a product type, or what efficacy data it needs, under the EU BPR, GB BPR or Swiss biocides rules.
How does it differ from concurrent and preventive disinfection?
The difference comes down to whether, and when, a source of infection is present. Preventive disinfection is done when no confirmed source of infection exists, on places and items that may be contaminated. Concurrent disinfection is done while the source of infection is still present. Terminal disinfection is a single thorough disinfection after the source has left.
Approach: The China CDC disease-control collection in the datasets has no definitions of these terms, so the definitions below come from official Chinese National Health Commission (NHC) standards and the NHC protocol hosted by WHO. Of the three official definitions I found in English (China's, the CDC's and NHS Scotland's), only the Chinese standards formally define all three terms.
Side-by-side (Chinese national standards)
| Preventive (预防性消毒) | Concurrent (随时消毒) | Terminal (终末消毒) | |
|---|---|---|---|
| Trigger | "No clearly identified source of infection is present" (my translation) | A source of infection is still present in the infectious focus | The source of infection has left the infectious focus |
| Purpose | Disinfect places and items that may be contaminated by pathogens | Promptly kill or remove the pathogens the source is shedding | One thorough disinfection, so the place and items no longer carry pathogens |
| Frequency | Routine and periodic, for example after each run of a public transport vehicle | Ongoing; GB 19193-2003 says it "should be carried out daily (1-2 times)" in an infectious patient's home | Once, at the end |
| Typical example | Wiping vehicle surfaces with 250-500 mg/L available-chlorine disinfectant after each run (WS 695-2020) | Disinfecting contaminated items and the patient's excreta while the patient is in an isolation ward or at home | The ward after a patient's discharge, transfer or death; the home after the patient is hospitalised or dies |
What each source says
- Preventive disinfection
- WS 695-2020 (NHC, public transport during COVID-19) defines it as disinfection of places and items that may be contaminated by pathogenic microorganisms, carried out "when no clearly identified source of infection is present" (my translation). In the same standard, terminal disinfection is "the thorough disinfection carried out after the source of infection has left the infectious focus" (my translation). (WS 695-2020, clause 2)
- WS 695 also shows how disinfection steps up. Preventive disinfection is the routine measure. Once a suspected or confirmed case, or an asymptomatic infected person, is found on board, terminal disinfection follows at higher strength: 1,000 mg/L available chlorine or 500 mg/L chlorine dioxide. (clauses 3.2 to 3.3)
- WS/T 700-2020 applies the same idea to flood-hit areas. It warns against spraying where there is no indication for disinfection ("防止过度消毒", prevent over-disinfection). If an outbreak is found, its clause 4.9 switches to disinfection of the epidemic site under GB 19193. (WS/T 700-2020, clauses 3.5, 4.4, 4.9)
- Concurrent and terminal disinfection
- These two are the sub-types of "disinfection of an infectious focus" in GB 19193, General Principles of Disinfection for Infectious Foci.
- Concurrent disinfection is done while the source is present, "to promptly kill or remove the pathogenic microorganisms discharged by the source" (my translation).
- Terminal disinfection is the final, thorough disinfection after the source has left. The standard also sets pass criteria: at least a 90% kill rate of natural bacteria on surfaces, and no pathogen detected. (GB 19193-2003, clauses 3.3, 3.4, 4.1.2, 4.2.1)
- The copy I could open is the 2003 edition. The NHC COVID-19 protocol cites GB 19193-2015, which suggests a newer edition exists, so treat the 2003 wording as historical text. I could not open the 2015 text to confirm its definitions.
- NHC COVID-19 protocol, English version on WHO's website: it calls concurrent disinfection "disinfection at any time": "the timely disinfection of items and places contaminated by patients and asymptomatic infected persons." It advises against spray disinfection "when there are people in the room", a practical difference from terminal disinfection, which can include indoor air spraying when no one is in the room. (Annex 5, pp. 1-3)
Outside China: In the CDC and NHS Scotland sources from your earlier question, the counterpart to terminal cleaning is "routine cleaning" of an occupied room. Neither source sets out a separate preventive versus concurrent split.