fever (more than 38), cough: nonproductive or productive with mucoid, purulent or blood-tinged sputum, tachypnea, nasal flaring (children), pleuritic chest, Shortness of breath, Crepitations (rales), rhonchi, decreased breath sounds, other symptoms include fatigue, headache, myalgia, and arthralgia, Cyanosis, Pleural rub, Egophony, SpO2 < 92% (severe hypoxia)