With which chemical substance can an object/surface be decontaminated from Coronavirus?

Raj. CHO -2020

Applied Microbiology & Infection control

Easy

Appeared in: Raj. CHO -2020

Explanation

Sodium hypochlorite (household bleach) is a chlorine-releasing compound that acts as a powerful oxidizing agent, making it a universal disinfectant.
It is recommended by health authorities for surface disinfection against a broad spectrum of pathogens, including viruses like Coronavirus.
It is effective, fast-acting, and inexpensive, making it a practical choice for routine environmental cleaning in healthcare and home settings.
A 0.1% solution (1000 ppm) is typically sufficient for general surfaces, while a 0.5% solution (5000 ppm) is used for spills of blood or body fluids.

Option A: Formaldehyde is a highly toxic chemical and a potential carcinogen. It is used as a high-level disinfectant or for fumigation in controlled environments, not for routine surface cleaning due to its health risks.
Option B: Methanol (wood alcohol) has weak disinfectant properties and is highly toxic if ingested, inhaled, or absorbed through the skin. It is not used for disinfection in healthcare.
Option C: Glutaraldehyde is a high-level disinfectant used for sterilizing heat-sensitive medical instruments, such as endoscopes. It is toxic, an irritant, and requires special handling and ventilation, making it unsuitable for general surface disinfection.

Visual 1: Infographic: How to Prepare a 0.1% Bleach Solution - Shows a simple visual guide for diluting standard household bleach with water to achieve the correct concentration for surface disinfection.
Visual 2: Chart: Spectrum of Activity for Disinfectants - A chart comparing different classes of disinfectants (chlorine, aldehydes, alcohols, phenolics) and their effectiveness against bacteria, viruses, fungi, and spores.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Chemical Disinfection and Sterilization as background academic context rather than a clinical decision trigger.
Proper surface disinfection is a cornerstone of infection prevention and control, breaking the chain of transmission for pathogens like SARS-CoV-2.
Nurses must be proficient in selecting the appropriate disinfectant for the specific situation (routine cleaning vs. blood spill) and using it safely and effectively.
What if? If a surface is visibly soiled with blood, the protocol changes. The nurse must first clean the visible matter, then use a stronger 0.5% sodium hypochlorite solution (1:10 dilution of bleach) due to bleach being inactivated by organic material.

How to Approach the Question

First, identify the core task in the question: surface decontamination for Coronavirus.
Recall that Coronavirus is an enveloped virus, which is generally susceptible to most common disinfectants.
Evaluate each option based on its primary use, effectiveness, and safety for general surface cleaning.
Eliminate Formaldehyde and Glutaraldehyde, recognizing them as high-level disinfectants for instruments, not general surfaces, due to their high toxicity.
Eliminate Methanol, knowing it is a toxic alcohol with poor disinfectant properties.
Identify Sodium Hypochlorite (bleach) as a common, effective, and recommended disinfectant for surfaces, making it the correct choice.

Concept Tested & Keywords

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