Over the past few months, evidence has mounted that the virus’s primary mode of transmission is through the air. One study in March found the virus on air vent blades in a Covid-19 patient’s room in Singapore. Another the same month showed that infectious particles could float in lab-generated aerosols—tiny bits of liquid smaller than 5 microns—for up to three hours. Singing or talking loudly could even propel coronavirus-laced aerosols: In May, the CDC reported that following a two-and-a-half-hour choir practice, 32 people tested positive for Covid-19.
Zaller adds that he hasn’t seen any studies that have linked a cluster of infections to a contaminated surface or piece of plastic. “Now, that’s not to say that people shouldn’t be cautious,” Zaller says. “Disinfect everything, I certainly advocate for that. But going to this extreme—that we have to have all the single-use plastics—to me, there’s no real logic or science behind