Related Experiment Video
Updated: Jan 6, 2026

Halogenated Agent Delivery in Porcine Model of Acute Respiratory Distress Syndrome via an Intensive Care Unit Type Device
Published on: September 24, 2020
Hypochlorous Acid (HOCl) as a Promising Respiratory Antiseptic
Michael Winter1, Dirk Boecker2, Wilfried Posch3
1Team Winter Kompetenztraining, 1030 Vienna, Austria.
Abstract:
The COVID-19 pandemic has inflicted unprecedented pressure on communities and healthcare systems around the world. An outstandingly broad and intensive investigation of possible therapeutic interventions is currently taking place to prevent similar future threats to the global population. Investigating the related mechanisms of action is often complex and time consuming. Moreover, research on biochemical interactions of new drugs involves a considerable amount of effort, consequently bearing inherent financial and operational risks for pharmaceutical companies. An interesting approach to counteract colonization and infection is the concept of antiseptic treatment in vivo. Antiseptics are cost-effective and globally accessible, due to their ease of production, transportation and handling. A broad spectrum of active agents with different properties is readily available. One of these substances is hypochlorous acid (HOCl), which is also a naturally occurring biocidal agent and as such part of the innate immune system. Its successful history of medical use in wound treatment, combined with low cytotoxicity and documented efficacy against various pathogens, suggests that HOCl might be an effective agent for treating the respiratory mucosa. This could potentially enable therapeutic inhalation for combating bacterial infections and viral pathogens such as human respiratory syncytial, influenza, and SARS-CoV-2 viruses, which will be discussed in the present article.
Insights
Hypochlorous acid (HOCl), a natural immune agent, shows promise as a cost-effective antiseptic for respiratory infections. Its low cytotoxicity and broad efficacy suggest potential for treating viral and bacterial pathogens via inhalation.
Area of Science:
- Medical Research
- Infectious Diseases
- Biochemistry
Background:
- The COVID-19 pandemic highlighted the need for effective global health interventions.
- Investigating new therapeutic mechanisms is complex, time-consuming, and costly.
- Antiseptic treatments offer a cost-effective and accessible approach to infection control.
Purpose of the Study:
- To explore the potential of hypochlorous acid (HOCl) as an in vivo antiseptic for respiratory tract infections.
- To assess HOCl's suitability for therapeutic inhalation against various pathogens.
- To discuss the mechanisms and efficacy of HOCl in combating respiratory illnesses.
Main Methods:
- Literature review of existing research on hypochlorous acid (HOCl).
- Analysis of HOCl's properties, including its natural occurrence, biocidal activity, and cytotoxicity.
- Examination of HOCl's historical medical applications, particularly in wound care.
- Evaluation of potential efficacy against respiratory pathogens like SARS-CoV-2, influenza, and RSV.
Main Results:
- Hypochlorous acid (HOCl) is a naturally occurring component of the innate immune system.
- HOCl exhibits broad-spectrum antimicrobial activity with low cytotoxicity.
- Previous medical use in wound treatment demonstrates HOCl's safety and efficacy.
- HOCl's properties suggest potential for treating respiratory mucosa infections.
Conclusions:
- Hypochlorous acid (HOCl) presents a promising, accessible therapeutic option for respiratory infections.
- Therapeutic inhalation of HOCl could be a viable strategy against bacterial and viral respiratory pathogens.
- Further research into HOCl for respiratory applications is warranted given its favorable profile.
Related Concept Videos
Hand hygiene
Hand washing...
Chemical Agents for Microbial Control
Carboxylic Acids to Acid Chlorides
Mixtures of Acids
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
Acute Respiratory Failure-V
Ensure that patients are monitored continuously for their response to therapy, including changes in...
Surface Membrane Barriers
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...

