A 69‐year‐old female presented to the emergency department with a 1‐week history of low‐grade fever, progressive dyspnea on exertion, fatigue, and confusion. She denied headache, nausea, vomiting, weakness, numbness or tingling in her extremities, orthopnea, chest pain, or swelling of her legs. Although previously very active, she had become homebound over the same duration and was not able to perform her daily activities. Her medications included mometasone‐formoterol inhaler and zafirlukast for chronic obstructive lung disease and ibuprofen as needed for joint pain for the past 2 years, none of which was newly prescribed. She had a history of allergy to nonspecific environmental allergens. She denied any history of rash or recent travel.