What Kills Viruses? A Guide by Virus Type
"Does hand sanitizer kill it?" has no single answer, and the reason is structural: some viruses are wrapped in a fatty membrane that alcohol dissolves, and some are not. This page sets out the agent-by-virus evidence for the four viruses this network covers in depth — norovirus, COVID-19, Ebola and hantavirus — including which agents fail, how long each virus survives in the environment, and where no authority publishes a number at all.
The one rule that explains most of the confusion. Alcohol kills viruses by dissolving a lipid envelope. Enveloped viruses — coronaviruses, ebolaviruses, hantaviruses, influenza — have one, so alcohol works on them. Norovirus does not, so it does not. Soap and water works on both, because it removes virus mechanically instead of relying on chemistry. Almost every "but I used sanitizer and still got sick" story is this distinction.
The Agent × Virus Matrix
Each cell records what the responsible authority actually specifies for that virus, not a general inference. Where an agent is effective in principle but the agency does not name it for that use, the cell says so — that distinction matters if you are following a cleanup protocol rather than satisfying curiosity.
| Agent | Norovirus non-enveloped | SARS-CoV-2 enveloped | Ebola virus enveloped | Hantavirus enveloped |
|---|---|---|---|---|
| Soap and water (hands) | First choice. CDC: sanitizer "is not a substitute for handwashing"; scrub 20 seconds | Effective | Effective; WHO names soap and water or alcohol hand rub | Effective; CDC specifies handwashing after any rodent-area cleanup |
| Alcohol hand rub (60–80%) | Underperforms. CDC: "does not work well against norovirus." Supplement only | Effective when hands are not visibly soiled | Effective; alcohol-based hand rub is standard in Ebola care settings | Not named by CDC for cleanup use — evaporates long before the 5-minute contact time |
| Chlorine bleach (surfaces) | Required. CDC: 5–25 tbsp household bleach per gallon (≈1,000–5,000 ppm) | Effective; an EPA-registered product is the usual route | Standard in outbreak settings; 0.5% solutions for body-fluid spills per WHO practice | CDC's recipe: 1 part bleach to 9 parts water (1.5 cups per gallon), 5-minute contact |
| Quaternary ammonium ("quat") wipes | Not reliably effective without bleach or a registered norovirus claim | Effective — many EPA-registered products are quat-based | Not the named agent in outbreak protocols | Acceptable only if the label says "disinfectant"; follow the label's own contact time |
| Hydrogen peroxide | Accelerated hydrogen peroxide products with a registered norovirus claim work | Effective; widely registered | Not the named agent in outbreak protocols | Not named by CDC for this use |
| Vinegar / "natural" cleaners | Not effective | Not a disinfectant; no EPA registration | Not a disinfectant | Not a disinfectant |
| Heat (cooking / laundry) | Relatively heat-resistant: CDC says it can survive 145°F (63°C) — cook shellfish thoroughly, wash hot, dry on highest heat | Readily inactivated by normal laundry temperatures | Inactivated by heat; incineration is used for waste | CDC: launder in hot water with detergent, machine dry on high or air-dry in sun |
| Sunlight / UV | Not part of CDC's norovirus protocol | Not a household control measure per CDC | Not part of outbreak protocols | CDC's own instruction for papers and unwettable items: leave outdoors in sunlight for several hours |
| Sweeping or dry vacuuming | Avoid dry-handling vomit; never shake contaminated laundry (aerosolises virus) | Not a stated hazard | Avoid any dry handling of contaminated material | Never. Dry sweeping or vacuuming aerosolises the virus — this is the primary route of human infection |
How Long Each Virus Lasts in the Environment
This is the second half of the question and the half most often answered with invented precision. Here is what is actually published, and what is not.
| Virus | Published environmental survival | What that means in practice |
|---|---|---|
| Norovirus | CDC: "can persist on surfaces for days or weeks and is resistant to many common disinfectants." CDC publishes no per-surface breakdown. | The long survival plus an infectious dose measured in tens of particles is why one contaminated handle can seed an outbreak weeks later. Norovirus transmission → |
| Hantavirus | Puumala virus excreted by infected bank voles remained infectious to other voles in contaminated bedding at room temperature for 12–15 days (Kallio et al., J Gen Virol 2006). This is Puumala, a European hantavirus — not Sin Nombre, the US species. | Two weeks is long enough that a cabin or shed closed up for a fortnight is not self-sterilising. It is the experimental basis for treating old droppings as hazardous. Hantavirus cleanup protocol → |
| SARS-CoV-2 | Remained viable in experimental aerosols, and persisted longer on plastic and stainless steel than on copper or cardboard (van Doremalen et al., N Engl J Med 2020). CDC assesses real-world surface transmission as low risk relative to inhalation. | Surfaces are not the main route for COVID — air is. Cleaning matters least here of the four. COVID variants → |
| Ebola virus | No surface-survival time is published by CDC or WHO. Contaminated objects — needles, bedding, clothing — are named as a transmission route with no duration attached. | Ebola control is built around direct contact with body fluids and with the bodies of the dead, not around fomite half-lives. Ebola transmission → |
Reading an EPA-Registered Label
In the United States a product may only claim to kill a specific virus if EPA has registered that claim, and the registration is pathogen-specific. EPA publishes the registered lists by pathogen — the SARS-CoV-2 list, the norovirus list, the Ebolavirus list, and a list of products qualifying for emerging-viral-pathogen claims — at its selected registered disinfectants page. Three practical consequences:
- "Kills 99.9% of germs" is not a virus claim. It usually refers to bacteria. Look for the named virus, or the EPA registration number, and check it against the relevant list.
- A COVID claim is not a norovirus claim. This is the single most common labelling mistake in a household: a wipe registered against SARS-CoV-2 is registered against an enveloped virus, and says nothing about norovirus.
- Contact time is part of the claim. A surface must stay visibly wet for the time the label states — commonly 1 to 10 minutes. Wiping dry immediately voids the registered efficacy, and this is why alcohol wipes cannot satisfy a five-minute protocol: they evaporate first.
Five Mistakes the Search Data Keeps Surfacing
- Using hand sanitizer during a norovirus outbreak. A 2011 survey of long-term care facilities in northern New England found that facilities whose staff were equally or more likely to use alcohol sanitizer than soap and water for routine hand hygiene had higher odds of a confirmed norovirus outbreak (Blaney et al., Am J Infect Control 2011). Sanitizer is a supplement, never the plan.
- Using the hantavirus bleach recipe for everything. 1:9 is CDC's rodent-cleanup strength. It is far stronger than CDC's norovirus surface guidance needs, and stronger is not better — more surface damage, more fumes, no shorter contact time.
- Dry-sweeping a rodent-contaminated space. For hantavirus this is not a cleaning error, it is the exposure event: the virus reaches people by being aerosolised from dried urine, droppings and nesting material. Ventilate 30 minutes, wet everything down first, never sweep or vacuum.
- Shaking out contaminated laundry. CDC's norovirus laundry instruction is explicit about not shaking soiled items, for the same aerosolisation reason.
- Assuming a quick steam kills norovirus in shellfish. CDC states norovirus can survive temperatures as high as 145°F (63°C); "thorough" cooking to at least that internal temperature is the point, not brief steaming.
Scope. This page summarises published disinfection guidance and peer-reviewed environmental-survival measurements for orientation. It is educational information, not medical advice, not an occupational-safety plan, and not a substitute for a product label. For any cleanup covered by an employer's duty of care — healthcare, food service, remediation work — follow the operative agency protocol and your state occupational-safety authority, not a summary. Where this page and a product label or agency page disagree, the label and the agency govern.
Frequently Asked Questions
Does hand sanitizer kill viruses?
For enveloped viruses — coronaviruses, ebolaviruses, hantaviruses, influenza — yes, because alcohol dissolves the lipid envelope. For norovirus, which has no envelope, CDC states sanitizer "does not work well" and "is not a substitute for handwashing." Soap and water works on both groups because it removes virus mechanically.
What disinfectant kills norovirus?
Chlorine bleach — CDC's recipe is 5–25 tablespoons of household bleach per gallon of water (≈1,000–5,000 ppm) — or an EPA-registered product carrying a specific norovirus claim, including accelerated hydrogen peroxide formulations. Quats without bleach, alcohol wipes and vinegar are not reliably effective.
How long do viruses survive on surfaces?
By orders of magnitude differently, and for some viruses nobody publishes a figure. Norovirus: "days or weeks" per CDC. Hantavirus: 12–15 days at room temperature for Puumala virus in an animal experiment. SARS-CoV-2: viable in experimental aerosols, longer on plastic and steel than on copper or cardboard, but a low real-world transmission route. Ebola: no published surface-survival time.
What is the difference between enveloped and non-enveloped viruses?
An enveloped virus carries a lipid membrane taken from a host cell; alcohol, detergents and most disinfectants disrupt it and the virus falls apart. A non-enveloped virus is a bare protein shell — no membrane to dissolve — so it tolerates drying, disinfectants and time far better. That is the whole reason norovirus behaves differently from the other three viruses on this page.
What bleach dilution should I use?
It depends on the pathogen. CDC specifies 1 part bleach to 9 parts water (1.5 cups per gallon) with five minutes of wet contact for rodent and hantavirus cleanup, and a much weaker 5–25 tablespoons per gallon for norovirus surfaces. Mix fresh — diluted bleach loses strength — and never mix bleach with ammonia or acids.
Sources & References
- Centers for Disease Control and Prevention. Preventing Norovirus and How Norovirus Spreads — bleach concentration, sanitizer limitation, "days or weeks" surface persistence, 145°F heat resistance, laundry instruction. cdc.gov/norovirus/prevention
- Centers for Disease Control and Prevention. How to Clean Up After Rodents (reviewed April 8, 2024) — 30-minute ventilation, 1:9 bleach (1.5 cups per gallon), five-minute contact time, no sweeping or vacuuming, sunlight for unwettable items. cdc.gov/rodents/cleaning
- Kallio ER, Klingström J, Gustafsson E, et al. Prolonged survival of Puumala hantavirus outside the host: evidence for indirect transmission via the environment. J Gen Virol 2006;87(8):2127–34. doi:10.1099/vir.0.81643-0 · PMID 16847107
- van Doremalen N, Bushmaker T, Morris DH, et al. Aerosol and surface stability of SARS-CoV-2 as compared with SARS-CoV-1. N Engl J Med 2020;382(16):1564–7. doi:10.1056/NEJMc2004973
- Blaney DD, Daly ER, Kirkland KB, et al. Use of alcohol-based hand sanitizers as a risk factor for norovirus outbreaks in long-term care facilities in northern New England, December 2006 to March 2007. Am J Infect Control 2011;39(4):296–301. doi:10.1016/j.ajic.2010.10.010
- U.S. Environmental Protection Agency. Selected EPA-Registered Disinfectants — the pathogen-specific registered product lists. epa.gov/pesticide-registration/selected-epa-registered-disinfectants
- World Health Organization. Ebola disease — fact sheet (transmission routes, including contaminated objects; hand hygiene). who.int/news-room/fact-sheets/detail/ebola-disease
- U.S. Food and Drug Administration. Food Code 2022, §2-201 — exclusion and reinstatement rules that sit behind the norovirus food-service guidance referenced here. fda.gov/food/fda-food-code