Yesterday the Centers for Disease Control and Prevention updated, for the second time in a week, guidance for healthcare workers on using face masks, including N95 respirators and surgical masks, while treating possible COVID-19 patients in conventional, contingency, and crisis settings.To the surprise of many, the guidance recommended that nurses, doctors, and staff fashion homemade masks out of scarves and bandanas if there is a shortage of face masks in clinics and hospitals.CDC tells health workers to improvise"In settings where facemasks are not available, HCP might use homemade masks (e.g., bandana, scarf) for care of patients with COVID-19 as a last resort.