The Scientific World Journal

The Scientific World Journal / 2021 / Article

Review Article | Open Access

Volume 2021 |Article ID 9342748 |

Abdolmajid Fadaei, "Viral Inactivation with Emphasis on SARS-CoV-2 Using Physical and Chemical Disinfectants", The Scientific World Journal, vol. 2021, Article ID 9342748, 6 pages, 2021.

Viral Inactivation with Emphasis on SARS-CoV-2 Using Physical and Chemical Disinfectants

Academic Editor: Noureddin Nakhostin Ansari
Received06 Jun 2021
Accepted02 Oct 2021
Published25 Oct 2021


Background. Recently, an outbreak of a novel human coronavirus SARS-CoV-2 has become a world health concern leading to severe respiratory tract infections in humans. Virus transmission occurs through person-to-person contact, respiratory droplets, and contaminated hands or surfaces. Accordingly, we aim at reviewing the literature on all information available about the persistence of coronaviruses, including human and animal coronaviruses, on inanimate surfaces and inactivation strategies with biocides employed for chemical and physical disinfection. Method. A comprehensive search was systematically conducted in main databases from 1998 to 2020 to identify various viral disinfectants associated with HCoV and methods for control and prevention of this newly emerged virus. Results. The analysis of 62 studies shows that human coronaviruses such as severe acute respiratory syndrome (SARS) coronavirus, Middle East respiratory syndrome (MERS) coronavirus or endemic human coronaviruses (HCoV), canine coronavirus (CCV), transmissible gastroenteritis virus (TGEV), and mouse hepatitis virus (MHV) can be efficiently inactivated by physical and chemical disinfectants at different concentrations (70, 80, 85, and 95%) of 2-propanol (70 and 80%) in less than or equal to 60 s and 0.5% hydrogen peroxide or 0.1% sodium hypochlorite within 1 minute. Additionally, glutaraldehyde (0.5–2%), formaldehyde (0.7–1%), and povidone-iodine (0.1–0.75%) could readily inactivate coronaviruses. Moreover, dry heat at 56°C, ultraviolet light dose of 0.2 to 140 J/cm2, and gamma irradiation could effectively inactivate coronavirus. The WHO recommends the use of 0.1% sodium hypochlorite solution or an ethanol-based disinfectant with an ethanol concentration between 62% and 71%. Conclusion. The results of the present study can help researchers, policymakers, health decision makers, and people perceive and take the correct measures to control and prevent further transmission of COVID-19. Prevention and decontamination will be the main ways to stop the ongoing outbreak of COVID-19.

1. Introduction

Like other countries of the world, Iran has been adversely affected by the pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and Middle East respiratory syndrome (MERS) coronavirus. As the third highly pathogenic human coronavirus, COVID-19 has emerged in the last two decades. The virus transmission through human-to-human contact has been reported both in hospital and family settings [1].

Since the 1970s, approximately 40 novel infectious diseases have been detected, and over the last 20 years, several major outbreaks have occurred, including SARS (2002-2003), H1N1 flu (swine flu) (2009-2010), Ebola (2014–2016), Zika virus (2015-2016), and COVID-19 (2019-2020) [2, 3]. Though respiratory pathogens, such as flu, spread through airborne dispersion of small particle aerosols (≤5 μm) generated by breathing, coughing, or sneezing of an infected person, respiratory syncytial viruses, SARS-CoV, and MERS-CoV can be transmitted via large droplets blown through the air into the eyes, nose, and mouth in a short distance [4, 5]. A variety of disinfectants such as sodium hypochlorite, hydrogen peroxide, alcohols, povidone-iodine, or glutardialdehyde, ultraviolet radiation, and dry heat or moist heat are used across the world for disinfection, mainly in hospitals [6, 7].

By this review, we aimed to provide a summary of all information available on the persistence of all coronaviruses, including emerging SARS-CoV and MERS-CoV, as well as bestial coronaviruses such as contagious canine coronavirus (CCV), transmissible gastroenteritis virus (TGEV), and mouse hepatitis virus (MHV), on various types of inanimate surfaces and the efficacy of the widely applied surface disinfectants used against different types of viruses and coronaviruses.

2. Method

In order to identify various viral disinfectants associated with HCoV and methods for control and prevention of this newly emerged virus, a comprehensive search was systematically conducted between 1998 and 2020 in main databases, including the Elsevier Bibliographic Database (Scopus), Institute for Scientific Information (ISI) Web of Science, Google Scholar, and PubMed (MEDLINE), using free text words, MeSH (Medical Subject Headings), and their possible combination. The last search was conducted on November 25, 2020. We searched in the aforementioned databases with proper keywords: (“Viruses” OR “Coronaviruses” OR “CoV” OR “Human Coronaviruses “OR “HCoV” OR “nCov” OR “Novel Coronaviruses” OR “2019 Novel Coronavirus” OR “Covid-19” OR “2019-nCoV” OR “Severe Acute Respiratory Syndrome- Coronaviruses-2” OR “SARS-COV-2”) AND (“Disinfectant” OR “Disinfection” OR “Chemical Inactivation” OR “Physical Inactivation” OR “Biocidal Agents”). To avoid bias, we systematically investigated the title, abstract, and full text of the studies. Then, information such as first author’s name, publication year, country, type of disinfectant (a few disinfectants used the commercial brand), concentration, type of virus, strain/isolate, contact time, reduction of viral infectivity (log10), and main findings was extracted. A total of 208 peer-reviewed publications were accessed based on the relevance of titles to the research. These were further screened to 123 after reading through their abstracts. After screening the full text of the papers, 62 cases were used for this review, excluding the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) reference [8]. Papers were excluded as a result of irrelevant abstracts to our review goals, inconsistent titles with abstract and full-text content, insufficient presentation of information, use of irrelevant statistical tools, not supported scientific claims, or extreme violation of certain assumptions in results’ explanation and discussion (Figure 1).

3. Results

According to the searched studies, different types of physical disinfectants used for viral inactivation include dry heat, moist heat, gamma irradiation, visible light plus methylene blue (MB) (plasma units), and ultraviolet C (Table 1). Moreover, among chemical disinfectants, ethanol (70–95%), 2-propanol (70–100%), the combination of 45% 2-propanol with 30% 1-propanol, and Desderman (78% ethanol) readily inactivated coronavirus, poliovirus, and adenovirus infectivity by approximately 2–5 log10 or more. Hydrogen peroxide was effective at a concentration of 0.5% and a contact time of 1 min with virucidal efficacy against coronavirus and influenza type A. Sodium hypochlorite (0.001–0.6%) readily inactivated poliovirus, adenovirus, Ebola, HIV, and coronavirus infectivity by approximately 0.9–7 log10 or more. Glutaraldehyde (0.5–2%), formaldehyde (0.7–1%), and povidone-iodine (0.1–0.75%) could readily inactivate different viruses including type A influenza virus, a type of coronavirus (Table 2).

DisinfectionConcentrationVirusStrain isolateRetention timeReduction of viral infectivity (log10)Reference

UVC (254 nm)Dose of 3 J/m2SARS-CoV-2Isolate FFM-111–34 min1.0[9]
UVC (254 nm)Dose of 7 J/m2SARS-CoV-2Isolate FFM-111–34 min2.0[9]
UVC (254 nm)Dose of 28 J/m2SARS-CoV-2Isolate FFM-111–34 min3.0[9]
UVC (254 nm)Dose of 140 J/m2SARS-CoV-2Isolate FFM-111–34 min6.0[9]
UVC (254 nm)Dose of 6.9 J/m2SARS-CoV-22 h1.0[10]
UVB (300 nm)Dose of 1400 J/m2Vaccinia virus2 h2.0[11]
UVC (254 nm)Dose of 0.2 J/cm2SARS-CoV-2Frankfurt 1≥3.4[12]
UVC (254 nm)Dose of 0.2 J/cm2CCHFVAfg09-2990≥2.2[12]
UVC (254 nm)Dose of 0.2 J/cm2NiVMalaysia≥4.3[12]
UVC (222 nm)Dose of 0.56 mJ/cm2HCoV229E1.0[13]
UVC (222 nm)Dose of 0.39 mJ/cm2HCoVOC431.0[13]
Pulsed-xenon ultraviolet lightSARS-CoV-2USA-WA1/20202 min>4.54[14]
Visible light plus MB (plasma units)120 J/cm2MERS-CoVEMC/2012≥3.3[12]
Visible light plus MB (plasma units)120 J/cm2EBOVMayinga-76≥4.6[12]
Gamma irradiation1 mradSARS-CoV-1Strain Tor 25 s>4.0[15]
Dry heat90°CPoliovirusStrain Sabin1 min>4.6[16]
Dry heat90°CAdenovirusType 51 min3.9[16]
Dry heat60°CCCVSP-80 strain1 min1.56[17]
Dry heat60°CMHVRV-13 strain1 min2.87[17]
Dry heat80°CCCVSP-80 strain1 min>4.04[17]
Dry heat80°CMHVRV-13 strain1 min>3.88[17]
Dry heat56°CSARS-CoVIsolate FFM-130 min≥5.01[18]
Dry heat60°CSARS-CoVIsolate FFM-130 min≥5.01[18]
Dry heat4°CPEDVStrain CV777120 min0.0[19]
Dry heat40°CPEDVStrain CV777120 min1.0[19]
Dry heat56°CPEDVStrain CV77710 min1.0–1.7[20]
Dry heat56°CMERS-CoVMERS-CoV strain Hu/France-FRA2_130569/2013 (FRA2)30 s0.1–0.9[21]
Dry heat56°CCCVStrain S37830 min≥5.01[22]
Moist heat90°CPoliovirusStrain Sabin1 min>5.0[18]
Moist heat90°CAdenovirusType 51 min>4.1[18]

CCHFV: Crimean-Congo haemorrhagic fever virus; NiV: Nipah virus; EBOV: Ebola virus; MB: methylene blue; SARS: severe acute respiratory syndrome; MERS: Middle East respiratory syndrome; MHV: mouse hepatitis virus; CCV: canine coronavirus; HCoV: human coronavirus; TGEV: transmissible gastroenteritis virus; PEDV: porcine epidemic diarrhoea virus.

DisinfectionConcentrationVirusStrain isolateContact timeReduction of viral infectivity (log10)Reference

Ethanol95%SARS-CoVIsolate FFM-130 s≥5.5[23]
Ethanol80%MERS-CoVStrain EMC30 s>4.0[24]
Ethanol70%PoliovirusStrain Sabin1 min2.1[16]
Ethanol70%AdenovirusType 51 min2.4[16]
2-Propanol100%SARS-CoV-2Isolate FFM-130 s≥3.31[23]
2-Propanol70%SARS-CoV-2Isolate FFM-130 s≥3.31[23]
Desderman (78% ethanol)78%SARS-CoV-2Isolate FFM-130 s≥5.01[23]
Sterillium (45% 2-propanol and 30% 1-propanol)45% and 30%SARS-CoV-2Isolate FFM-130 s≥2.78[23]
Hydrogen peroxideVapor of unknown concentrationTGEVPurdue strain type 12-3 h4.9–5.3[25]
Hydrogen peroxide0.5%HCoVStrain 229E1 min>4.0[26]
Hydrogen peroxide0.5%Influenza A virusPR-81 min>4.75[26]
Hydrogen peroxide0.5%HCoVType 371 min>4.25[26]
Benzalkonium chloride0.04%HCoVStrain 229E1 min<3.0[27]
Didecyldimethylammonium chloride0.0025%CCVStrain S3783 d>4.0[28]
Sodium hypochlorite2500 ppmPoliovirusStrain Sabin10 min4.5[16]
Sodium hypochlorite2500 ppmAdenovirusType 510 minND[16]
Sodium hypochlorite10 ppmCCVSP-80 strain10 min0.9[17]
Sodium hypochlorite100 ppmCCVSP-80 strain10 min1.05[17]
Sodium hypochlorite0.5–0.6%Ebola virus10 min1.1[29]
Sodium hypochlorite0.5%HIV1 min≥7[29]
Formaldehyde0.7%SARS-CoVIsolate FFM-12 min>3.01[18]
Formaldehyde1%SARS-CoVIsolate FFM-12 min>3.01[18]
Glutaraldehyde0.5%SARS-CoVIsolate FFM-12 min>4.01[18]
Glutaraldehyde2%HCoVStrain 229E1 min>3.0[27]
Glucoprotamin26%SARS-CoVIsolate FFM-12 min>1.68[27]
Magnesium monoperphthalate0.5%SARS-CoVIsolate FFM-130 min>4.5[27]
PVP-I surgical scrub (7.5 g/L available iodine)7.5 g/LMERS-CoVIsolate HCoV-EMC/201215 s4.64[30]
PVP-I skin cleanser (4 g/L available iodine)4 g/LMERS-CoVIsolate HCoV-EMC/201215 s4.97[30]
PVP-I gargle and mouthwash (1 g/L available iodine)1 g/LMERS-CoVIsolate HCoV-EMC/201215 s4.30[30]
Povidone-iodine0.23%SARS-CoVIsolate FFM-115 s4.60[4]
Povidone-iodine0.23%MERS-CoVIsolate HCoV-EMC/201215 s4.40[4]
Povidone-iodine0.23%Influenza virus AH1N115 s5.67[4]

ND: not done; SARS: severe acute respiratory syndrome; MERS: Middle East respiratory syndrome; MHV: mouse hepatitis virus; CCV: canine coronavirus; HCoV: human coronavirus; TGEV: transmissible gastroenteritis virus.

4. Discussion

Viral inactivation by physical and chemical disinfectants has a wide application in human disease-control programs to prevent the spread of viral infectious diseases. The veridical activity of chemical compounds and physical agents cannot be predicted reliably only on the basis of their mechanism of action and the nature and morphology of the viruses to be inactivated. Physical disinfectants including UVC disinfection system for surface disinfection in 11–34 min exposure time with more than (5 log10 reduction) 99.999% efficiency can inactivate SARS-CoV-2. Additionally, UVC light affects viruses, such as vaccinia virus, CCHFV, and NIV with inactivation efficiency more than 99% (2-log10 reduction). One study reported higher susceptibility of nonenveloped viruses to UVC radiation than enveloped ones [31]. Exposure to UV-C radiation showed no significant effects on canine coronavirus inactivation for up to 3 days [22]. Findings of one study showed that SARS-CoV-2 is 3-fold more sensitive to UV than influenza [10]. Another study showed that ultraviolet light at 134 W/cm2 for 15 min inactivates the infectivity of SARS-CoV-2 by 99.999% [11]. Another study showed that ultraviolet light at 0.162 W/cm2 for 30 min inactivates infectivity of SARS-CoV and provides less than 1-log10 reduction [32]. Ultraviolet radiation in sunlight is the primary virucidal agent in the environment [11]. Until now, most useful cases of coronavirus inactivation have been accomplished using mercury vapor lamps with peak radiation at 254 nm [33]. Gamma irradiation at 1 mrad is effective for the inactivation of coronavirus in a short contact time. Dry heat (56°C, 60°C, 80°C, and 90°C) is used to inactivate poliovirus, adenovirus, and a type of coronavirus, and moist heat is used to inactivate poliovirus and adenovirus. One study reported that CCV was completely inactivated at 65°C after 40 min and at 75°C after 30 min [22, 34]. Another study found that, at 56°C, most of the viruses (SARS-CoV-2) were inactivated after 20 min [35]. One study reported that SARS-CoV was completely inactivated at 56°C after 90 min, at 67°C after 60 min, and at 75°C after 30 min [32]. Dry heat at 60°C for 30 min, 65°C for 15 min, and 80°C for 1 min could vigorously decrease coronavirus infectivity by at least 99.99% [36]. One study reported that SARS-CoV-2 was completely inactivated at 56°C after 30 min, at 60°C after 60 min, and at 92°C after 15 min [37].

4.1. Inactivation of Viruses by Chemical Disinfectants

Various chemical disinfectant compounds such as Desderman (78% ethanol), ethanol with different concentrations (70, 80, 85, and 95%), 2-propanol (concentration of 70 and 80%), and Sterillium (45% 2-propanol and 30% 1-propanol) are used for viral inactivation. The WHO has recommended the use of alcohol-based (containing at least 60% alcohol) hand sanitizers when soap and water are not available [38]. Ethanol 62–71% used for disinfection of small surfaces exhibited a similar efficacy against coronavirus [39].

Hydrogen peroxide vapor in the gas phase at a concentration of 0.05% required 1 min exposure time to inactivate the influenza type A virus—a type of coronavirus. A minimum concentration of sodium hypochlorite of 0.001% could effectively inactivate some types of viruses in 1 min. On the contrary, sodium hypochlorite 0.6% required more contact time to inactivate poliovirus, adenovirus, Ebola, HIV, and coronavirus. According to our data in this study, the WHO also recommended the use of bleach solution at concentrations of 1 to 5% for disinfection of surfaces at different times [40]. Bleach is typically used at a concentration of 0.05% [39]. Authors found that sodium hypochlorite 6% and phenolic compounds 5% were effective in inactivation of coronavirus [41]. Disinfectants such as formaldehyde (0.7–1%) and glutaraldehyde (0.5–2%) were effective in inactivation of coronavirus. Glucoprotamin (26%) and magnesium monoperphthalate (0.5%) also required more contact time for the destruction of coronavirus. One study reported that CCV was incubated with formaldehyde (0.036% and 0.009%) and glutaraldehyde (0.002% and 0.001%) at different temperatures to evaluate their virus-inactivating potential [41]. Glutaraldehyde is a main dialdehyde used as a disinfectant and sterilizer, specifically for hospital instruments, and is widely applicable as a means of inactivating viruses, bacteria and their spores, and fungi [22]. Povidone-iodine with a concentration of 0.1, 0.23, 0.4, and 0.75% could readily inactivate different coronaviruses and influenza type A infectivity in 15 s by approximately more and equal to 4-log10 (≥99.99). Another study showed that UVC irradiation, dry heat, formaldehyde (formalin), glutaraldehyde, and excessive pH value were able to inactivate SARS-CoV [35]. The enveloped viruses such as coronavirus and influenza were more readily inactivated by physical and chemical disinfectants than nonenveloped viruses, such as adenovirus and poliovirus.

4.2. General Recommendations to Be Followed

Before using any disinfectant, any surface should be initially cleaned with a water and detergent solution. Then, healthcare disinfectants such as formaldehyde, glutaraldehyde, and sodium hypochlorite can be applied.

The disinfectant concentration and exposure time play the most important role in surface viral inactivation.

5. Conclusions

In conclusion, the obtained results indicated that the WHO-recommended alcohol-based formulations were validated with various enveloped viruses. A strong veridical effect against newly emerged pathogens, including EBOV, SARS-CoV, and MERS-CoV, could be demonstrated implicating the applicability of these WHO formulations in healthcare, public health, and outbreak associated with these types of viruses.

Data Availability

All the data generated or analyzed during this study are included within the article.

Conflicts of Interest

The author declares no conflicts of interest.

Authors’ Contributions

A. M. Fadaei conceptualized and designed the study, interpreted the data, drafted the article, and read and approved the final manuscript.


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Copyright © 2021 Abdolmajid Fadaei. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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