Six students and a visitor have fallen ill with meningitis at Princeton University in New Jersey, shown here in August 2013. All have recovered or are recovering, officials said. Bloomberg via Getty Images hide caption

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Yoset, a spiritual healer near Arua, Uganda, works with the Centers for Disease Control and Prevention to detect the plague in his village. Courtesy of Mary Hayden hide caption

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Urine tests are the gold standard for diagnosing bladder infections. But one common test, the urine culture, can easily miss infections. Ian Hooton/http://www.sciencesource.com/ hide caption

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Public school student Julio Valenzuela, 11, grimaces as he gets a vaccination before the start of the school in Lynnwood, Calif., on Aug. 27. Vaccines are required for school attendance. ROBYN BECK/AFP/Getty Images hide caption

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Scans from patients with fungal meningitis show evidence of a stroke (left) and arachnoiditis. New England Journal of Medicine hide caption

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A young girl stands in the doorway of a home in Uttar Pradesh, India. The markings on the door show that a polio immunization team vaccinated children in the home. Alyce Henson/Courtesy of Rotary International hide caption

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Histoplasma capsulatum is common in soil in the Midwest and Mid-Atlantic. So how did it get a rancher in Montana sick? CDC hide caption

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Hawah Alhassan, 5, contracted Guinea worm in a village near Tamale, Ghana, in 2007. The country eliminated the parasite in 2011. Wes Pope/MCT/Landov hide caption

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A nurse treats a cholera patient at the Juan Pablo Pina Hospital in San Cristobal, Dominican Republic, in August. Health officials say that the strain of cholera circulating in the country— the same one that first appeared in Haiti three years ago — has also caused outbreaks in Cuba and now Mexico. Erika Santelices/AFP/Getty Images hide caption

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Syrian opposition fighters sit on the front line in the city of Deir Ezzor on Oct. 13. Ongoing violence has ravaged the city since March 2011. AFP/Getty Images hide caption

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The botulism toxin comes from Clostridium botulinum bacteria, seen here in a colorized micrograph. James Cavallini/Science Source hide caption

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