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Prolonged SARS‐CoV‐2 infection in immunocompromised individuals has been scattered, but the details remain unclear. We conducted a prospective study with 26 COVID‐19 patients with haematological malignancies to determine viral shedding kinetics and characteristics. We obtained nasopharyngeal swabs from the patients 21–28 days post‐onset for a PCR test and performed virus isolation from the PCR‐positive...