Plus, the volcanic eruption in Iceland
|  | Thursday, August 4, 2022 | | | | |
 | PHOTOGRAPH BY ALEX WELSH, THE NEW YORK TIMES/REDUX
| | When Anthony Fauci and President Joe Biden got COVID-19, they both tested positive again only days after receiving negative results. Their cases reflect a “rebound” phenomenon that is now on the rise in the U.S.
There's no definitive link between rebound and usage of Paxlovid, the antiviral drug that lessens the effects of COVID-19 if used near the onset of infection. Pfizer has publicized trials of the drug’s effectiveness while the Delta variant was dominant, when only 2 percent of patients reported rebound cases. With newer and more infectious variants, however, rebound cases are likely woefully undercounted, health officials say. At the same time, the exact causes of rebound remain murky.
“It’s hard to ignore the anecdotal evidence of rebounding peppered throughout social and mass media,” epidemiologist Katelyn Jetelina tells Nat Geo, as we examine rebound cases and antivirals.
Read the full story here.
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 | | VIDEO BY CHRIS BURKARD | | | |
| | Hello world: One-week-old Caribbean flamingo chicks start the day under their parents’ protection. This photo was taken in a blind at a safe distance from the birds, with the permission of the reserve in Río Lagartos, Mexico. Flamingos are a popular Nat Geo topic, with recent articles on conservation in Florida and the now-famous Bob the Flamingo in Curaçao. | | | |
 | | PHOTOGRAPH BY MARK THIESSEN, NAT GEO IMAGE COLLECTION | | | Lifesavers: Horseshoe crabs save humans with their blood, which is used in production of everything from insulin to COVID vaccines. But can humans protect the crabs, which have existed for 450 million years, from ourselves? Dina Fine Maron examines the effect on the crabs from sharply rising human demand for their blood. (Pictured above, horseshoe crab blood, which is blue because of its high copper content.) | | | |
 | | I thought it was about time to tell the truth about female animals and what a kind of extraordinary, diverse, dominant, aggressive, competitive, promiscuous bunch of creatures we are. | | | | Lucy Cooke | | Author, Bitch: On the Female of the Species; Nat Geo Explorer | | |
 | | PHOTOGRAPH BY KLEIN & HUBERT, NATURE PICTURE LIBRARY | | | Home protection: Trimming the grass around their homes may be a chore for many humans, but for Brandt’s voles it’s a matter of life and death. A vole (shown above) chops the grass near its burrow so it can watch for and avoid predatory birds, which move to other hunting grounds, Nat Geo reports in its monthly Breakthroughs column. | | | |
| This newsletter was curated and edited by David Beard, Jen Tse, Heather Kim, and Allie Yang. Do you have an idea for the newsletter? Let us know. Missed yesterday’s earth-shaking newsletter? It’s right here. Thanks for reading! | |
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