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To reduce the chance of catching or spreading COVID-19 at home, combine several measures: stay up to date on vaccination, improve indoor air, practise good hygiene, and respond promptly when someone develops respiratory symptoms. If someone is sick, limit close contact and shared air where practical; masks and testing can add protection and help guide next steps. No single measure guarantees prevention.
Build everyday protection into your home
The CDC describes vaccination, good hygiene, and cleaner air as core prevention strategies. These measures work in layers: improving air does not replace vaccination or precautions around illness, and none of them eliminates risk. See the CDC’s COVID-19 prevention guidance for current recommendations.
Stay up to date on vaccination
Follow current vaccination recommendations that apply to you. Recommendations can change, so check the CDC guidance and local public-health advice rather than relying on an older schedule.
Keep up good hygiene
Good hygiene is one part of prevention. Wash your hands regularly, especially before preparing or eating food and after coughing, sneezing, or blowing your nose. Avoid touching your face with unwashed hands.
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Improve the air you share
Respiratory viruses can spread through the air, particularly indoors. When practical, bring in outdoor air, filter indoor air, or spend time outdoors instead of gathering inside. The CDC’s cleaner-air guidance, dated August 18, 2025, describes opening doors or windows and using exhaust fans as ways to bring in fresh air. It also suggests using portable HEPA air cleaners.
What to do when someone at home develops symptoms
When a household member has respiratory symptoms, the CDC advises staying home and away from others, including household members who are not sick, while symptoms are present. Follow the CDC’s current guidance on when to return to normal activities: How to Protect Yourself and Others.
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Reduce contact and shared air
If possible, have the sick person use a separate room. WHO’s household-care suggestions recommend this approach; if people must share a room, keep distance and have the sick person and others in the room wear medical masks. Open windows when possible to create a cross-breeze, and try not to move air from the sick person’s room into the rest of the home. These are supplemental international recommendations; follow current local public-health advice as well. See WHO’s ventilation and air-conditioning guidance.
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Test and seek care promptly when risk is high
Testing can help determine what to do next. If the sick person has risk factors for severe illness, contact a healthcare provider promptly about testing and treatment. COVID-19 treatment is time-sensitive and needs to start within a few days of symptom onset, according to the CDC.
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Use cleaner air as a layer, not a guarantee
Ventilation and filtration address indoor air in different ways. Ventilation brings in outdoor air; a portable air cleaner filters air already in the room. The U.S. EPA says both can help reduce airborne contaminants, including SARS-CoV-2, when used appropriately, but neither is enough on its own. Read the EPA’s guidance on indoor air in homes and COVID-19.
Improve ventilation
Open windows or doors when conditions allow, and use exhaust fans where available. For a home with central HVAC and a filter, the CDC suggests running the system fan continuously when visitors are present and using pleated filters, changing them every three months or according to the manufacturer’s instructions. The CDC’s recommendation of five or more air changes per hour is aimed at organizations, not presented as a household requirement.
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Consider a portable HEPA air cleaner
A portable HEPA air cleaner sized for the room is an optional way to add filtration. The CDC’s archived home-ventilation page advises checking the unit’s clean air delivery rate (CADR): a larger CADR means the air is cleaned faster. That page was last updated April 13, 2023, so check current product instructions. This is general selection guidance, not a ranking or test of any particular unit.
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- Choose a cleaner sized for the room where it will be used, and compare its CADR.
- Place it where people spend the most time.
- Position airflow so it does not blow from one person toward another.
- Follow the manufacturer’s instructions for operation and filter replacement.
A portable cleaner adds filtration; it does not bring outdoor air into the home. CDC’s archived home ventilation guidance offers additional selection advice.
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Choose masks for fit and consistent use
A mask or respirator can lower transmission risk, particularly when people need to share indoor space. Fit matters: NIOSH explains that a closer fit and better filtration are expected to capture more particles, while gaps allow particles to pass. Choose an option that fits closely and that the wearer can use consistently. The available guidance supports these selection principles, not a ranking of specific models. See CDC/NIOSH’s community respirators and masks guidance.
When someone is ill, separating them from others is more effective for protecting household members than relying on a mask or respirator alone. Use masking as an added layer when separation is not possible.
Choose measures that fit the situation
| Situation | Practical steps |
|---|---|
| Everyday prevention | Stay up to date on vaccination, practise good hygiene, and improve indoor air when practical. |
| Someone develops respiratory symptoms | Stay home and away from household members who are not sick; reduce close contact and shared air where possible; consider testing. |
| People need to share a room | Keep distance, use masks, bring in outdoor air when possible, and avoid directing airflow from the sick person toward others. |
| A household member is at risk for severe illness | Contact a healthcare provider promptly about testing and treatment because treatment must begin within a few days of symptom onset. |
| Considering an air cleaner | Look for a room-sized portable HEPA cleaner, compare CADR, and place it where people spend the most time without directing airflow from one person toward another. |
Keep guidance current
COVID-19 recommendations can change. Check the linked CDC pages for current U.S. guidance and follow local public-health advice where you live. WHO’s household ventilation suggestions above are supplemental international guidance, not a substitute for local recommendations.
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