Live: Coronavirus daily news updates, May 26: What to know today about COVID-19 in the Seattle area, Washington state and the world

For two years, you beat the odds. You masked, kept your distance, got your shots.

Now, despite those efforts, you, your child, or someone else in your home has come down with COVID-19. And the last thing you want is for the virus to spread to everyone in the family or household. But how do you prevent it from circulating when you live in close quarters?

The Centers for Disease Control and Prevention recommends isolating COVID patients for at least five days, preferably in a separate room with access to their own bathroom, as well as diligent mask-wearing for both patient and caregiver. But for many families, those aren’t easy options. Not everyone has an extra bedroom to spare, let alone a free bathroom. Young children should not be left alone, and the youngest can not tolerate masks.

“For parents of a young child, it’s pretty difficult not to be exposed,” said Dr. Preeti Malani, chief health officer at the University of Michigan. “You have to work back from the perfect to the possible and manage your risk the best you can.”

But take heart. Scientists say there is still a lot of people can do to protect their families, chief among them improving ventilation and filtration of the air.

“Ventilation matters a lot,” said Dr. Amy Barczak, an assistant professor of medicine at Harvard Medical School. “If you’re taking care of someone at home, it’s really important to maximize all the interventions that work.”

Outside the home, viruses are quickly dispersed by the wind. Inside, germs can build up, like clouds of thick cigarette smoke, increasing the risk of inhaling the virus.

The best strategy for avoiding the virus is to make your indoor environment as much like the outdoors as possible.

Start by opening as many windows as the weather allows, said Joseph Fox, a heating, ventilation, and air conditioning engineer for a large school district in Ontario, Canada. If possible, open windows on opposite sides of the home to create a cross breeze, which can help sweep viruses outside and bring fresh air inside.

For extra protection, place a box fan in the patient’s window, facing outward, to draw air outside.

To prevent infected air from seeping out of the sickroom, try wedging towels in the gap under the bedroom door. People should also cover return air grills with plastic. These grills cover vents that suck air out of the room and recycle it through the heating or cooling system.

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