Influenza virus pneumonia

Onset of symptoms often include general flu symptoms, such as sudden onset, cough, sore throat, accompanied by fever, headache, myalgia, and discomfort. The symptoms continue to develop, with persistent fever, shortness of breath, cyanosis, paroxysmal cough, and hemoptysis. The sputum volume is often small, but it can carry blood. Secondary bacterial infections usually occur within 2 weeks after the onset of symptoms, with symptoms such as high fever or symptoms alleviating and then exacerbating. The sputum became purulent, and symptoms and signs of bacterial pneumonia appeared. The pathogens are mostly Streptococcus pneumoniae, Staphylococcus aureus and Haemophilus influenzae. Influenza virus pneumonia is common in people with chronic heart and lung disease, chronic metabolic disease, and chronic kidney disease, leading to worsening of the underlying disease. Chest X-ray examination at the beginning of the disease can be seen along the hilum to the periphery of the inflammatory infiltration, later appeared scattered flaky, flocculent shadows, often distributed in multiple lung fields, in the late stage showed fusion changes, mostly concentrated in the lung field Band, similar to pulmonary edema. The diagnosis of influenza virus pneumonia depends on the onset and typical clinical manifestations of influenza during the epidemic, and influenza viruses are isolated from secretions such as sputum and lung tissues. Bacterial and other pathogenic infections such as meningococcal disease, legionella disease, and mycoplasma pneumonia need to be excluded. The diagnosis of secondary bacterial pneumonia can be confirmed by bacterial culture of sputum, lung tissue, pleural effusion, blood and other specimens.