In her three decades of working with elephant seals, Dr. Marcela Uhart had never seen anything like the scene on the beaches of Argentina’s Valdés Peninsula last October. It was peak breeding season; the beach should have been teeming with harems of fertile females and enormous males battling one another for dominance. Instead, it was […]
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In the month since federal authorities announced an outbreak of bird flu on dairy farms, they have repeatedly reassured the public that the spate of infections does not impact the nation’s food or milk supply, and poses little risk to the public. Yet the outbreak among cows may be more serious than originally believed. In […]
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Mammograms can miss tumors in women with dense breast tissue. So for these patients, doctors often include a second scan — ultrasound, for example, or an M.R.I. — which are more likely to turn up cancers at early stages. But some older patients are running into an unexpected twist. Though many women see the extra […]
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A pill taken once a week. A shot administered at home once a month. Even a jab given at a clinic every six months. In the next five to 10 years, these options may be available to prevent or treat H.I.V. Instead of drugs that must be taken daily, scientists are closing in on longer-acting […]
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The outbreak of dengue fever that has unfolded in Latin America over the past three months is staggering in its scale — a million cases in Brazil in a matter of weeks, a huge spike in Argentina, a state of emergency declared in Peru, and now another, in Puerto Rico. It forewarns of a changing […]
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I hate mosquitoes so much that I bring my own bug repellent to parties. But in early March, on a trip with my partner to the idyllic island of Curaçao off the coast of Venezuela, I was caught off guard by insect bites after our bed-and-breakfast hosts said that mosquitoes didn’t usually appear until late […]
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