This one is on a topic that I thought would be of particular interest to everyone on a regular basis. It's about how to handle groceries and delivery bags.
It's written by Joseph G. Allen, who is an assistant professor of exposure and assessment science, and director of the Healthy Buildings Program at Harvard University’s T.H. Chan School of Public Health. He not only gives strong and easy suggestions on how to deal with the issue, but makes clear up front: "The risk is low." And then adds why, adding, "Let me explain."
He writes --
"First, disease transmission from inanimate surfaces is real, so I don’t want to minimize that. It’s something we have known for a long time; as early as the 1500s, infected surfaces were thought of as “seeds of disease,” able to transfer disease from one person to another. In that NEJM study [New England Journal of Medicine], here's the finding that is grabbing headlines. The coronavirus that causes covid-19 "was detectable...up to four hours on copper, up to 24 hours on cardboard and up to two to three days on plastic and stainless steel."
The key word here is "detectable."
Yes, the virus can be detected on some surfaces for up to a day, but the reality is that the levels drop off quickly. For example, the article shows that the virus’s half-life on stainless steel and plastic was 5.6 hours and 6.8 hours, respectively. (Half-life is how long it takes the viral concentration to decrease by half, then half of that half, and so on until it’s gone.)
You can read the full article here.