An elderly Dutch woman has become the first known person to die from catching twice, according to experts, raising serious questions about how long immunity and antibodies can last.The woman, 89, suffered from a rare type of bone marrow cancer called Waldenström's macroglobulinemia. Her immune system was compromised due to the cell-depleting therapy she received, the researchers at Maastricht University Medical Center in the Netherlands wrote in a .However, the researchers said her natural immune response could still have been "sufficient" to fight-off COVID-19, as the type of treatment she...…An elderly Dutch woman has become the first known person to die from catching twice, according to experts, raising serious questions about how long immunity and antibodies can last.The woman, 89, suffered from a rare type of bone marrow cancer called Waldenström's macroglobulinemia. Her immune system was compromised due to the cell-depleting therapy she received, the researchers at Maastricht University Medical Center in the Netherlands wrote in a .However, the researchers said her natural immune response could still have been "sufficient" to fight-off COVID-19, as the type of treatment she...WW…