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It is a live vaccine which means it contains a weakened version of the chickenpox virus. As such, it is not recommended for those with a compromised immune system because of an illness like HIV or as a result of treatment such as chemotherapy.
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One of the dead was hit by the tram as it derailed while the second victim was a passenger, the city’s mayor, Giuseppe Sala, told reporters at the scene.
"Unfortunately no organ would save him but it was his final wish that his life should benefit others and indeed 17 people benefitted from him donating all of his organs when he died," she said.
Thanks to Steven Forsythe for sharing a report on the use of agar seaweed in Britain during WWII, Barbara Buchberger at the Robert Koch Institute for pointing out Koch’s use of gelatine for the identification of cholera, and the surviving relative of Fanny Angelina Hesse for sharing a trove of unpublished material.