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The outbreak of H5N1 avian influenza among U.S. dairy cows, first reported on March 25, has now spread to at least 33 herds in eight states. On Wednesday, genetic evidence of the virus turned up in commercially available milk. Federal authorities say the milk supply is safe, but this latest development raises troubling questions about how widespread the outbreak really is. (Zeynep Tufekci, 4/24)

On Wednesday, a divided Supreme Court listened to arguments over a state’s abortion ban – its first such hearing since the justices overturned Roe v. Wade. The case, in which the Joe Biden administration is challenging Idaho’s abortion ban, literally puts the health and even the lives of pregnant women on the line. (Lisa Jarvis, 4/25)

If you had asked me at the start of this Supreme Court term what the blockbuster abortion case would be, I would have focused on the one that could limit access to mifepristone, a drug used in a majority of U.S. abortions. But oral arguments last month suggested strongly that the justices might not even think that case has standing — which is to say, that decision is likely not to make much of a difference. (Mary Ziegler, 4/25)

That history today offers us insight into the origin of Havana syndrome, the controversial medical condition best known for afflicting U.S. diplomats and intelligence officials. Many victims of these “anomalous health incidents” believe they suffer from brain injuries from a secret Russian acoustic or radiological microwave weapon. (Keith Kloor, 4/24)

Last year was called the year of Ozempic, though it was also a year of Ozempic backlash and Ozempic shortages, which could persist for years. (David Wallace-Wells, 4/24)