Which of the following is an appropriate disinfection method for parvovirus-contaminated environments?

• A. Bleach diluted 1:30 applied for 10 minutes
• B. Trifectant spray only
• C. Stem cleaning
• D. Parvocidal disinfectant is ineffective

Answer: (A)

Parvovirus is a non-enveloped virus that is exceptionally resistant to many disinfectants, so effective environmental disinfection depends on using a chlorine-releasing agent at a concentration that is proven to inactivate the virus and allowing enough contact time. Diluted bleach (sodium hypochlorite) around 1:30–1:32 with at least 10 minutes of wet contact time provides a reliable level of virucidal activity against parvovirus, even on surfaces with organic matter if the area is first cleaned to remove debris. Freshly prepared solution, thorough coverage of all contaminated surfaces, and keeping the surfaces wet for the full contact time are key. This approach is more reliable than a spray-only product or methods that don’t ensure sufficient concentration and contact time, and it aligns with established guidance for parvovirus environmental decontamination. Steam cleaning can reduce viral load but does not guarantee complete inactivation without a compatible chemical disinfectant, and claims that no disinfectant is effective against parvovirus are not accurate.