“We now have a greater understanding of Covid-19 transmission that signifies symptom-based screening has restricted effectiveness as a result of individuals with Covid-19 might don’t have any signs or fever on the time of screening, or solely delicate signs,” the C.D.C. mentioned in a press release.

Temperature checks are akin to “getting the oil checked earlier than you go on a protracted automobile journey,” mentioned Dr. David Thomas, an infectious illness specialist at Johns Hopkins College Faculty of Medication. “It makes you are feeling higher, but it surely’s not going to maintain you from wrecking the automobile or stop the tires from falling off. It’s not going to make your journey any safer.”

“It’s one thing you are able to do, and it makes you are feeling such as you’re doing one thing,” he mentioned. “However it gained’t catch most people who find themselves spreading Covid.”

Most individuals who spike a fever really feel awful, and presumably would cancel their dinner plans, mentioned Dr. Thomas McGinn, Northwell Well being’s senior vp and deputy doctor in chief. Temperature checks would possibly decide up a couple of people who’re unaware of their fever, he mentioned.

However the absence of fever “means nothing,” he mentioned. “It’s not a really delicate check.”

It does, nonetheless, convey a powerful public well being message, serving as a reminder that folks should take precautions, and that itself could also be of profit, Dr. McGinn mentioned. “It makes individuals assume twice, and reminds them that it is a huge deal, we nonetheless have to be cautious, you want somebody to face by the door to do this,” he mentioned.

However right here’s the rub: Whereas fever is usually a symptom of Covid-19, the illness brought on by the coronavirus, not everybody contaminated with the virus develops a fever, or many different signs, for that matter. Physicians writing within the New England Journal of Medication have referred to as the phenomenon of symptomless unfold the “Achilles’ heel of Covid-19 pandemic management.”

Proof of asymptomatic unfold dates again to early within the pandemic, however has been mounting ever since. A current research from South Korea printed in JAMA Inner Medication in August supplied much more proof, discovering that contaminated people who don’t really feel ailing might carry simply as a lot virus of their nostril, throat and lungs as these with signs — and for nearly as lengthy.

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