SÃO PAULO—As the new coronavirus ripped through a government-run hospital here, Dilva Barbosa de Oliveira did all she could to save her patients. Then one day, the nurse’s body started to ache.
Ms. Barbosa de Oliveira, 56, grew fatigued, as a fever spiked. She had trouble urinating, started coughing and lost her sense of taste and smell. Gasping for breath, she was rushed to the Employees of São Paulo State Hospital where she worked, this time as a patient in intensive care. She tested positive for Covid-19, the illness caused…