During a respiratory-virus outbreak, employers should make it practical for sick workers to stay home, improve indoor air, support basic hygiene, and add precautions such as well-fitting masks when the situation calls for them. Tailor the response to job duties, the building, and local virus activity; healthcare workplaces must follow separate infection-control guidance.
What should I do if there’s a virus outbreak at work?
Start with measures that reduce the chance an infectious person shares indoor air with coworkers, then improve the air and reinforce accessible everyday precautions. CDC/NIOSH says workplace risk varies with the job and setting, so a crowded shared room or close-contact task may call for different measures from a largely remote or spacious workplace.
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- Make staying home practical. Ask workers with respiratory symptoms to stay home and explain available leave or telework options. Workers should not have to come in simply to report symptoms.
- Review the work and the space. Identify crowded indoor areas, shared rooms, close-contact tasks, and possible ventilation or filtration issues.
- Improve clean-air delivery. Check that HVAC systems operate as intended and meet applicable minimum outdoor-air requirements. Where feasible, combine outdoor air, central filtration, and appropriately sized portable air cleaners.
- Make hygiene supplies easy to use. Provide soap, water, drying supplies, tissues, bins, and sanitizer where handwashing is inconvenient; clean frequently touched surfaces.
- Add precautions proportionately. Consider well-fitting masks, distancing, or testing when risk is elevated, workers are returning after illness, or vulnerable people may be exposed.
- Revisit the plan. Use local respiratory-virus activity to inform measures such as masking or remote work, and adjust as conditions change.
Compare possible controls by whether they keep infectious people from sharing indoor air, how much clean air they can practically add, how well they fit the work, whether workers can use them consistently, and whether local rules or a specialized setting impose extra requirements. These are practical decision factors, not a quantified ranking of effectiveness. See CDC/NIOSH’s workplace prevention guidance.
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When can an employee come back after being sick?
For the general public, CDC says a person can resume normal activities when symptoms have been improving overall and they have been fever-free for at least 24 hours without fever-reducing medicine. For the following five days, use added precautions to reduce the chance of spreading infection. These may include a well-fitting mask, cleaner air, distancing, or testing, depending on the circumstances. The guidance is symptom-based; it is not a replacement for rules that apply to a particular workplace or pathogen. Read CDC’s stay-home and return precautions.
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How can we improve office air?
First confirm that the building’s ventilation system is functioning properly and meeting applicable minimum outdoor-air ventilation requirements. Increase outdoor air where feasible, use suitable central filtration, and consider portable air cleaners sized for the room. CDC/NIOSH advises aiming for five or more clean-air air changes per hour (ACH) when possible. Clean-air delivery can combine ventilation with equivalent filtration or air cleaning; it is not limited to outdoor air alone.
Five or more ACH is an aim, not a guarantee that a room is safe or that infections will fall by a particular percentage. CDC says the precise amount by which a given ventilation strategy lowers infection risk is unknown. Its ventilation guidance on aiming for 5 or more ACH explains the target and its limits; CDC’s cleaner-air guidance covers organizational steps.
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Which hygiene measures should a workplace provide?
- Encourage workers to cover coughs and sneezes and dispose of tissues in a bin.
- Provide convenient access to soap, water, and supplies for drying hands.
- Place sanitizer containing at least 60% alcohol where soap and water are not readily available.
- Clean frequently touched surfaces routinely.
These measures support a broader response; they do not replace staying home when sick or improving indoor air. See CDC’s handwashing guidance.
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Clinical workplaces and other specialized settings may have distinct infection-control and occupational-health requirements. Healthcare facilities should follow the guidance for their setting, including any source-control measures that apply in outbreak areas; general return-to-activity advice should not be treated as a substitute. Employers should also check local requirements and pathogen-specific public-health directions. The general U.S. guidance cited here does not establish a universal case-count threshold for declaring an outbreak, a mandatory reporting threshold, or state and local leave or notification duties. For healthcare, consult CDC’s infection-prevention guidance for healthcare settings.
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