BA.5 Outdoor Transmission: The Risk of Catching COVID-19

When the pandemic first began, COVID-19 seemed to lurk around every corner, so it came as a big relief when scientists established that the virus doesn’t easily spread outdoors. But this summer, the feeling of relative security has been questioned. The BA.5 subvariant drives a new wave here in America. Can Americans rely on open air safety to keep them safe now?

The truth is that being outside has never been a sure way to avoid COVID-19 transmission—especially at crowded events, like music festivals, which have been linked to outbreaks in the past. “We certainly hear, in our study, of people who pretty clearly were infected outdoors, so it happens,” says Dr. Donald Milton, professor of environmental health at the University of Maryland School of Public Health, who is principal investigator of an ongoing study on COVID-19 transmission. Of course, “it’s still a lower risk than indoors,” but Milton does not feel comfortable in every outdoor situation. “I didn’t go to the fireworks on July 4, and I have not been in any crowds,” he says. “My outdoor activities mostly consist of exercising, riding a bike, walking, and jogging.”

BA.5 appears to be able to avoid immunity from past infections and vaccines more easily than previous subvariants. Experts say this increases your risk, no matter where in the world. “We’re more susceptible hosts, and we’re more susceptible whether we’re inside or outside,” says Dr. Duane Wesemann, an associate professor at Harvard Medical School and an immunologist at Brigham and Women’s Hospital.

While scientists are still learning about BA.5, it’s increasingly clear that compared to past variants, it has advantages that help it bypass the immune system’s defenses. Like other Omicron subvariants, BA.5 has developed new mutations—in this case, in the spike protein, the part of the virus that binds to cells—which may help it to evade immunity, explains Bing Chen, an associate professor of medicine at Harvard Medical School and Boston Children’s Hospital who studies molecular medicine. “Our antibodies are a little less effective against BA.5 compared to BA.1 and Delta,” he says.

BA.5’s increased transmission and our diminished immune defenses mean that COVID-19 transmission outdoors has become more likely. But that doesn’t mean that being outdoors isn’t going to provide some protection—especially if you also take other precautions. Context is everything. Being in the open air and away from other people is safer than being in a crowd with worse air circulation—like in a packed baseball stadium without a breeze, says Milton. “Outdoors remains a much lower-risk setting than indoors,” says Linsey Marr, professor of civil and environmental engineering at Virginia Tech. “Transmission outdoors is most likely to occur in close, face-to-face conversation. There’s also the possibility of transmission if you happen to be close enough and downwind of someone who is infected.”

The same precautions that keep you safe indoors can also help outside, including avoiding crowds and wearing a mask when you’re with other people. Wesemann states that being current on COVID-19 shots will make it safer. These shots cause the immune system multiple kinds of defenses to COVID-19. While the virus is increasingly good at getting around the neutralizing antibodies—which help prevent people from getting infected in the first place—vaccines also trigger longer-lasting types of immune responses. In the end, that means that vaccinated people who get infected with COVID-19 are less likely to become very sick or die from the disease—no matter where they were infected.

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