Safety alert for hospital environments and health professional: chlorhexidine is ineffective for coronavirus

SUMMARY

An alarming fact was revealed by recent publications concerning disinfectants: chlorhexidine digluconate is ineffective for disinfecting surfaces contaminated by the new coronavirus. This is a finding that requires immediate disclosure since this substance is widely used for the disinfection of hands and forearms of surgeons and auxiliaries and in the antisepsis of patients in minimally invasive procedures commonly performed in hospital environments. The objective of this study is to compare the different disinfectants used for disinfection on several surfaces, in a review of worldwide works. Scientific studies were researched in the BVS (Virtual Health Library), PubMed, Medline, and ANVISA (National Health Surveillance Agency) databases. The following agents were studied: alcohol 62-71%, hydrogen peroxide 0.5%, sodium hypochlorite 0.1%, benzalkonium chloride 0.05-0.2%, povidone-iodine 10%, and chlorhexidine digluconate 0.02%, on metal, aluminum, wood, paper, glass, plastic, PVC, silicone, latex (gloves), disposable gowns, ceramic, and Teflon surfaces. Studies have shown that chlorhexidine digluconate is ineffective for inactivating some coronavirus subtypes, suggesting that it is also ineffective to the new coronavirus.

Coronavirus; Disinfection; Asepsis; Chlorhexidine

RESUMO

Um dado alarmante revelado por publicações a respeito dos agentes desinfetantes: o digluconato de clorexidina é ineficaz para desinfecção de superfícies contaminadas por coronavírus. Trata-se de uma constatação que reclama imediata divulgação, uma vez que essa substância é amplamente usada para degermação de mãos e antebraços dos cirurgiões e auxiliares e na antissepsia dos pacientes, em procedimentos minimamente invasivos, comumente em ambientes hospitalares. O objetivo deste trabalho foi comparar os diferentes desinfetantes usados para desinfecção em diversas superfícies em revisão de trabalhos mundiais. Foram pesquisados trabalhos científicos na BVS (Biblioteca Virtual de Saúde), PubMed, Medline e Anvisa (Agência Nacional de Vigilância Sanitária). Foram estudados os seguintes agentes: álcool 62-71%, peróxido de hidrogênio 0,5%, hipoclorito de sódio 0,1%, cloreto de benzancônio 0,05-0,2%, iodo povidina 10% e digluconato de clorexidina 0,02%, em superfícies de metal, alumínio, madeira, papel, vidro, plástico, PVC, silicone, látex (luvas), avental descartável, cerâmica e teflon. Os estudos demonstraram que o digluconato de clorexidina é ineficaz para a inativação de alguns subtipos de coronavírus, sugerindo que também seja ineficaz contra o novo coronavírus.

Coronavírus; Desinfecção; Assepsia; Clorexidina

INTRODUCTION

COVID-19 is a pandemic caused by a new coronavirus, Sars-CoV-2, which, by 28 May 2020¹ , had affected approximately 5,593,631 patients throughout the world, having been the cause of 353,334 deaths (https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200528-COVID-19-sitrep-9.pdf?sfvrsn=5b154880_2)² .

The exponential growth of the novel coronavirus resulted in the halting of the world economy. According to the United Nations Industrial Development Organization (UNIDO), the world is experiencing the greatest challenge of the post-war era due to the sudden stoppage of economic activity in developed and developing countries. The latest forecasts by the World Trade Organization (WTO) expect a global contraction of around 9% of the world economy³ .

Other pandemic outbreaks have happened before, including the Spanish flu (1917-1919), which killed between 50 and 100 million people⁴ , and the black plague, which struck Europe between 1347 and 1352 and that, according to Alfani and Murphy⁵ , was the worst plague of all times, killing between one- and two-thirds of the European population and also affecting the north of Africa and most of Asia.

The coronaviruses comprise a large family of viruses, common in humans and some animals, such as camels, oxen, cats, and bats⁶ . The most recent pandemic was caused by Sars-CoV-2, which, in its most severe presentation, causes severe acute respiratory failure. This pandemic began in December 2019, in the city of Wuhan, in the Chinese province of Hubei. It spread quickly through China and, soon after, worldwide. In March 2020, the World Health Organization (WHO) recognized the situation as a “pandemic” that, as defined by the entity, is a disease outbreak with a number of cases above the expected, affecting several countries and continents⁷ .

One of the factors that may be related to the rapid spread of the novel coronavirus is its great resistance to external environments, unlike other viruses, which are inactivated in seconds, which makes it a challenge regarding strategies of disinfection or adequate antisepsis⁸ .

Asepsis, antisepsis, and disinfection have different goals. Asepsis is the set of measures that we use to prevent the penetration of microorganisms in an environment that does not have them, i.e., which is free of infection. Antisepsis is the set of measures proposed to inhibit the growth of microorganisms or remove them from a particular environment, destroying them or not. Disinfection is the process of destroying microorganisms, pathogens or not, occurring in surfaces and objects by applying germicidal agents, classified as disinfectants⁹ .

In practice, the terms antiseptics and disinfectants are used as synonyms; however, they are characterized as antiseptics when used in living tissues, such as the skin and mucous membranes, and as disinfectants when used on inanimate objects, such as metals, wood, and latex⁹ .

Concern about the use of proper antiseptics and disinfectants is related to the health and safety of the people on the frontline of the pandemic. In this context, given the absence of a vaccine against Sars-CoV-2 and of effective treatments for the most acute stages of COVID-19, prevention and antisepsis measures, based on the use of effective disinfecting agents, according to the field of activity, are fundamental to control the dissemination of the disease.

Thus, this review aims to alert health authorities, health professionals, life maintenance agents, such as nurses, pharmacists, biomedicine professionals, paramedics, firefighters, police officers, among others, regarding the inefficiency of chlorhexidine digluconate against the new coronavirus and the need to use appropriate antisepsis and disinfection agents at a large scale.

SARS-COV-2

According to the Pan American Health Organization (PAHO), seven human coronaviruses (HCoVs) have been identified: HCoV-229E, HCoV-OC43, HCoV-NL63, HCoV-HKU1, Sars-CoV (which causes severe acute respiratory syndrome), Mers-Cov (which causes the Middle Middle East respiratory syndrome), and, most recently, the novel coronavirus (which at first was temporarily called 2019-nCoV and, on 11 February 2020, received the name of Sars-CoV-2), which is responsible for causing the COVID-19 disease¹⁰ .

The coronavíruses belong to the Coronaviridae family and are responsible for a variety of diseases in man and animals, affecting, in particular, the respiratory system. They are composed of single-stranded, positive-sense RNA, containing from 26 to 32 kilobases, and are associated with proteins, forming a nucleocapsid. Its particles present projections on their envelope shaped like spicules, formed by S protein (Spike protein) trimers. These projections look like a crown, hence the name coronavirus¹⁰ ( Figure 1 ).

FIGURE 1
MOLECULAR STRUCTURE OF THE NOVEL CORONAVIRUS (SARS-COV-2).

Sars-CoV-2 is transmitted mainly by respiratory droplets and has an incubation period of about 4-5 days before the onset of symptoms, which include fever, cough, breathing difficulties, headaches, muscle and/or joint pain, diarrhea, and nausea. In more severe cases, COVID-19 patients develop acute respiratory distress syndrome (ARDS). The severity of the disease is related not only to the viral infection but also to the host’s response, who may succumb to other underlying comorbidities¹² .

Some studies have shown that the human coronaviruses are very resistant outside a host and may remain active on various surfaces for up to nine days⁸ , which may explain the effectiveness of contagion and the unbridled spread of the novel coronavirus. According to a study published by Doremalen and collaborators¹³ , Sars-CoV-2 viruses have been detected in up to 72 hours after their application in plastic and stainless steel.

GERMICIDES USED AGAINST THE CORONAVIRUS

According to Geller, Varbanov, and Duval (2012)¹⁴ , a good germicide is considered effective as a disinfectant and antiseptic if it can induce, in well-defined contact time, a reduction in viral titers greater than 3 or 4 log_10, depending on the American and European regulatory agencies.

The sensitivity of HCoV 229E, a subtype of human coronavirus, to the action of antiseptic disinfectants was evaluated in a study published by Sattar and collaborators¹⁵ _, which validated disinfecting agents that reduced viral titers of 3 log ₁₀after exposure for 1 minute ( Table 1 ).

TABLE 1
ANTISEPTIC AND DISINFECTANT AGENTS THAT WORK AGAINST THE HCOV (HUMAN CORONAVIRUS).

Tested disinfectant antiseptics	Concentration	Reduction of the viral titer ≥ 3 log 10after 1 min
Sodium hypochlorite	0.10% and 0.50%	YES
Chloramine-T	0.10% and 0.30%	YES
Sodium hypochlorite/ Potassium bromide	0.05% and 0.10%	YES
Povidone-iodine	10%	YES
Ethanol	70%	YES
Glutaraldehyde	2%	YES
Chlorhexidine + Cetrimide	0.008% + 0.08%	NO
Chlorhexidine + Cetrimide + Ethanol	0.05% + 0.5% + 70%	YES

Source: Adapted from Sattar and colleagues (1989) 15.

Table 1 shows that chlorhexidine alone, associated to cetrimide or associated to less than 70% ethanol, which is widely used in medicine, is ineffective against the HCOV 229E, one of the lightest variants of the coronavirus, since reaches only 0.008-0.8 log ₁₀ of inactivation, except when associated with 70% ethanol¹⁵ .

The biocidal agent chlorhexidine is widely used in hospitals for antisepsis of cutaneous and mucosal surfaces in the antisepsis of the hands and forearms of surgeons and asepsis and antisepsis of surgical patients or patients undergoing invasive and minimally invasive procedures, such as peripheral punctures, placement of catheters, vesical tubes, drains, central venous catheters, and tracheostomies, all common procedures in patients admitted to intensive care units (ICUs)¹⁶ .

They are usually used at a concentration of 0.5% and may be associated with antiseptic solutions, aqueous or alcoholic, and are excellent germicides, according to Moriya and Modena⁹ . This is the option of choice against gram-positive bacteria, but its action is ineffective for the coronavirus family⁹ .

According to Colares (2015)¹⁷ , the microbicidal activity of chlorhexidine is mainly against gram-positive and gram-negative vegetative bacteria. It does not act on sporulating forms, except at high temperatures. Some lipophilic viruses, such as influenza, herpes virus, and HIV, are quickly inactivated.

Another study that is very relevant to this topic was conducted by the University of Medicine of Greifswald, Germany. It described the persistence of various strains of coronavirus, including Sars-CoV, Mers-CoV, and HCoV, on different surfaces. The authors demonstrated that these variants of the coronavirus can persist on inanimate surfaces, such as metal, glass, or plastic for between two hours and nine days⁸ .

In addition, this study also described the action of some disinfectant agents, including alcohol 70%, hydrogen peroxide 0.5%, sodium hypochlorite 0.1%, benzalkonium hydrochloride 0.05-0.2%, povidone-iodine 10%, and 0.02% chlorhexidine digluconate, comparing the inactivity of the several strains mentioned in several inanimate surfaces, such as metal, aluminum, paper, glass, plastic, PVC, silicone, latex (gloves), disposable aprons, ceramics, and Teflon ( Table 2 ). In this table, it is possible to observe that certain strains of coronaviruses are capable of resisting up to five days on metal, paper, glass, plastic, PVC, and silicone surfaces⁸ .

TABLE 2
PERSISTENCE OF THE CORONAVIRUS IN DIFFERENT INANIMATE SURFACES.

Surfaces	Virus	Inoculum (viral titer)	Temperature	Persistence
Steel	MERS-CoV	105	20o to 30°C	8h to 48h
Aluminum	HCoV	5x103	21oC	2-8h
Metal	SARS-CoV	105	Room temp.	5 days
Wood	SARS-CoV	105	Room temp.	4 days
Paper	SARS-CoV	105	Room temp.	4-5 days
Glass	SARS-CoV HCoV	105 103	Room temp. 21oC	4 days 5 days
Plastic	SARS-CoV MERS-CoV	105 105	22o to 25oC 20°C	≤ 5 days 48h
PVC	HCoV	103	21o	5 days
Silicone	HCoV	103	21o	5 days
Gloves (latex)	HCoV	5X103	21o	8h
Disposable apron	SARS-CoV	106	Room temp.	2 days

Source: Adapted from Sattar and colleagues (2020) 8.

The data in Table 3 are even more alarming, because they demonstrate that chlorhexidine reduces the titer of the MHV virus, a murine strain of the coronavirus, only in 0.7-0.8 log₁₀, and the standard level established by international bodies is ≥3 log ₁₀ of inactivation in 1 minute of exposure⁸ .

TABLE 3
INACTIVATION OF THE CORONAVIRUS BY DIFFERENT DISINFECTANTS.

Biocidal Agent	Concentration	Virus	Exposure Time	Reduction of viral activity (log10)
Ethanol	70%	MHV	10 min.	≥ 3.9
Sodium hypochlorite	0.21%	MHV	30 s	≥ 4.0
Hydrogen peroxide	0.5%	HCoV	1 min.	>4
Povidone-iodine	0.23% 0.23%	SARS-CoV MERS-CoV	15 s 15 s	≥ 4.4 ≥ 4.4
Glutaraldehyde	2.0%	HCoV	1 min.	>3
Chlorhexidine gluconate	0.02%	MHV	10 min.	0.7-0.8

Source: Adapted from Sattar and colleagues (2020) 8.

The study by Koh (2020) demonstrates a great increase of cases of COVID-19 infections among health professionals, making this a high-risk group. From 138 cases of patients treated at the Hospital of Wuhan, 40 (29%) were health professionals. Among those affected, 31 (77%) worked in general activities, seven (17.5%) in the emergency room, and two (5%) in the ICU¹⁸ .

The Federal Nursing Council (COFEN) (2020) published that already over 10,000 nurses, technicians, and nursing assistants have been removed from work due to COVID-19 in Brasil, with 88 deaths by May 2020. According to the Council, this figure is more than double than that of contaminated professionals in Italy (http://www.cofen.gov.br/cofen-publica-observatorio-diario-da-COVID-19-entre-profissionais-de-enfermagem_79551.html)¹⁹ . However, to date, no study has assessed the possible association between the use of chlorhexidine as a disinfection agent as a possible cause of dissemination of the novel coronavirus among health professionals, but this could be a potential factor for greater infection due to its inefficiency in inactivating the virus.

PROTECTIVE AND ANTISEPSIS MEASURES AGAINST THE NOVEL CORONAVIRUS

The Regional Council of Pharmacy of Minas Gerais created a booklet called PADM - Protocol for Antisepsis of Massive Disinfection in response to the novel coronavirus; we suggest its adoption as complementary care for the protection of the population and mainly of healthcare professionals who are at the frontline of the pandemic ²⁰ .

The PADM includes actions of antisepsis of the hands and forearms to eliminate a possible viral load; lips, tongue, and mucous membranes of the oral cavity; nostrils and oropharyngeal mucosa; eyeballs and lacrimal ducts; and dermis and mucosae of infected and hospitalized. The booklet also advocates for defining clean and dirty areas, based on green, yellow, and red areas, with basic cleaning actions for non-disposable PPE and measures for handling disposable materials²⁰ .

In addition, based on the data from Kampf (2020)⁸ , solutions of ethanol (78-95%), 2-propranolol 45%, in combination with 1-propanolol 30%, glutaraldehyde (0.5-2.5%), formaldehyde (0.7-1%), and povidone-iodine (0.23-7.5%) were the most effective agents for antisepsis, with a reduction of the viral load of 4 log ₁₀ or more, i.e., above the value recommended by the American and European authorities.

For the disinfection of rooms, patient waiting areas, surgical centers, and all common areas of hospitals, outpatient clinics, and other clinics, we suggest using pressurized backpack sprayers to massively apply sodium hypochlorite solutions at 0.1-0.5%, between 100 and 300 ml per m² , and in open areas (CCDCP, 2020)²¹ , since this has been proven to be greatly effective against the coronavirus, in addition to being very accessible.

According to a technical note published by the Brazilian Health Regulatory Agency (Anvisa), common household disinfectants, including water and soap or a solution of diluted bleach can deactivate the novel coronavirus on surfaces. This is due, mainly, to the fact that these disinfectants destroy the lipid layer that surrounds the coronavíruses²² .

In addition, the note also informs about alternatives to alcohol 70% that cannot be used to disinfect objects and surfaces, including sodium hypochlorite 0.1%, bleaches containing hypochlorite (sodium or calcium) 0.1%, povidone-iodine 1%, hydrogen peroxide 0.5%, peracetic acid 0.5%, benzalkonium chloride 0.05%, phenolic compounds, and disinfectants for general use approved by Anvisa.

In a decision published on 17 March of this year²³ , Anvisa exceptionally authorized the selling of chlorhexidine digluconate 0.5%, provided it is prepared according to the guidelines of the 2^nd edition, Revision 2, of the Brazilian Pharmacopoeia National Form²⁴ , which recommends adding other components to chlorhexidine, including isopropyl alcohol, benzalkonium chloride, polysorbate, lactic acid, and purified water. It is worth mentioning that, alone, chlorhexidine, as well as benzalkonium chloride, are not effective against the coronavirus⁸ .

According to these data, it is suggested that chlorhexidine at the usual concentrations of 0.5% and 2% marketed in Brasil, alone or associated with cetrimide or alcohol at less than 70%, is completely ineffective against the novel coronavirus⁸ , putting healthcare professionals at a greater chance of contamination.

CONCLUSION

According to the data found in the literature, chlorhexidine is ineffective for the disinfection of surfaces containing coronavirus subtypes, which leads us to believe that it is also ineffective against the novel coronavirus. These data lead to a great concern regarding the spread of the novel coronavirus among health professionals, in particular physicians and nurses and other life and order maintenance agents since chlorhexidine is widely used in surgical and invasive procedures in ICUs, particularly in view of the great resistance of the novel coronavirus on surfaces such as plastic, face shields, latex gloves, masks, and disposable aprons.

Therefore, the use of other disinfectant agents is recommended, among them alcohol 70%, sodium hypochlorite 0.1%, bleach containing hypochlorite (sodium or calcium) 0.1%, povidone-iodine 1%, which have proved to be more effective. In addition, we suggest the completion of studies to prove the effectiveness of the disinfecting agents listed in the paper against the novel coronavirus, Sars-CoV-2, in view of its high degree of dissemination and the absence of studies related to this type of virus.

Acknowledgments

We would like to thank the Must University for their support.

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Publication Dates

• Publication in this collection
  21 Sept 2020
• Date of issue
  2020

History

• Received
  17 June 2020
• Accepted
  28 June 2020