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epa09140293 Health workers treat a Covid-19 patient with a bubble helmet in Sao Leopoldo, Brazil, 16 April 2021. A hospital in the Brazilian city of Porto Alegre began to implant bubble helmets among Covid-19 patients to reduce the need for intubation, at a time when part of the hospitals in the state of Rio Grande do Sul are in collapse. EPA/Daniel Marenco