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Rod-shaped specimens of Yersinia pestis, the bacterial cause of plague, find a happy home here in the foregut of a flea. Fleas can transmit the infection to animals and people, who can get pneumonic plague and transmit the infection through a cough or kiss. Science Source hide caption

itoggle caption Science Source

Volunteer Patrick Pezzati searches yards in Turners Falls, Mass., for discarded heroin needles. Karen Brown/WFCR hide caption

itoggle caption Karen Brown/WFCR

Volunteers search for needles and other drug paraphernalia along Church Street in Austin, Ind., in April. The region has recorded 142 new HIV cases since December, according to the state, in an outbreak tied to injected-opioid use. Seth Herald/Nurphoto/Corbis hide caption

itoggle caption Seth Herald/Nurphoto/Corbis

A kit with naloxone, also known by its brand name Narcan, is displayed at the South Jersey AIDS Alliance in Atlantic City. Naloxone counters an overdose with heroin or certain prescription painkillers by blocking the receptors these opioids bind to in the brain. Mel Evans/AP hide caption

itoggle caption Mel Evans/AP

Brooke Borel says bedbugs were essentially wiped out after World War II thanks to DDT. It's not totally clear why they came back in the past couple of decades. iStockphoto hide caption

itoggle caption iStockphoto

NYU medical student Sara Stream (left) examines dancer Jazlyn Caing, who visited the clinic for low-grade orthopedic and respiratory problems. Fred Mogul/WNYC hide caption

itoggle caption Fred Mogul/WNYC

The number of women buying, selling and sharing breast milk is growing rapidly. But it can be a risky purchase, scientists say, because a mom can't tell by looking at the milk whether it's safe and nutritious for her baby. iStockphoto hide caption

itoggle caption iStockphoto

When it comes to an employee's mental health status, what does an employer need to know, or have a right to know? iStockphoto hide caption

itoggle caption iStockphoto