]> 2026-07-31T07:28:43+00:00 WBR0044 0 en ''Streptococcus pneumoniae'' ''Streptococcus pneumoniae'' is the most common cause of community acquired pneumonia (~50% of cases). It presents in older or immunocompromised individuals and is more acute and severe than this patient's presentation. ''Staphylococcus aureus'' ''Mycoplasma pneumoniae'' ''Moraxella catarrhalis'' Influenza virus Influenza virus can cause an atypical pneumonia but is a less common cause than ''Mycoplasma pneumoniae''. Patients with influenza virus infection often complain of headache, high-grade fever, chills, dry cough, pharyngeal irritation, and myalgias. It is usually self-limited and persists for approximately 2-8 days. Microbiology A 20-year-old woman presents to her primary care physician complaining of dyspnea and malaise, associated with a lingering cough. Her symptoms started one week ago and have been gradually worsening. Nonetheless, she is generally still able to perform her daily activities. She denies abnormal sputum production, chest pain, sore throat, or runny nose. Her past medical history is insignificant. She does not use any medications and has no known allergies. Her blood pressure is 120/70 mmHg, heart rate is 72/min, temperature is 101 °F (38.3 °C), respiratory rate is 22/min, and oxygen saturation is 94% on room air. On physical examination, her cardiac auscultation is unremarkable; but pulmonary auscultation reveals diffuse crackles bilaterally. Which of the following may be the causative agent of this patient's condition? C Pulmonology 2020-10-27T23:08:59Z 2459150.4645718 WBR0044