Successful use of casirivimab/imdevimab anti-spike monoclonal antibodies to enhance neutralizing antibodies in a woman on anti-CD20 treatment with refractory COVID-19.

Management of COVID-19 patients with humoral immunodeficiency is challenging. We describe a woman with COVID-19 with multiple relapses due to anti-CD20 monoclonal antibody treatment. She was successfully treated with casirivimab/imdevimab and confirmed to have neutralizing antibodies. This case suggests that monoclonal antibodies have therapeutic and prophylactic value in patients with humoral immunodeficiency.

Acute onset collagenous colitis associated with protein-losing enteropathy.

Collagenous colitis is a cause of chronic diarrhea. We report an atypical case of collagenous colitis, presenting with an acute onset, and associated with protein-losing enteropathy. An 82-year-old woman was admitted with a 1 week history of nausea, appetite loss, and diarrhea. Serum albumin level was low. Protein leakage from the small intestine was found by a Technetium-99m human serum albumin scintigraphy. We diagnosed the patient with collagenous colitis from pathology findings of multiple biopsies taken from the colon. This case implies that collagenous colitis should be considered in acute watery diarrhea, and that it can cause protein-losing enteropathy.