What are the complications of influenza?

What are the complications of influenza?

What are the complications of influenza?

 Complication
(1) The incidence of bacterial pneumonia is 5 to 15%. Two to four days after the onset of the flu, the condition is further aggravated, or the condition is aggravated after the recovery period of the flu, and there is high fever, severe cough, purulent sputum, difficulty breathing, lung wet voice and signs of lung consolidation. The total number of peripheral white blood cells and neutrophils increased significantly, mainly by Streptococcus pneumoniae, Staphylococcus aureus, especially methicillin-resistant Staphylococcus aureus, Streptococcus pneumoniae or Haemophilus influenzae.

(2) Pneumonia caused by other pathogens including Chlamydia, Mycoplasma, Legionella pneumophila, Fungi (Aspergillus), etc. When the pneumonia of influenza patients is invalidated by conventional anti-infective treatment, the possibility of fungal infection should be considered.


(3) Other viral pneumonias are common with rhinovirus, coronavirus, respiratory syncytial virus, parainfluenza virus, etc., which have a high incidence in patients with chronic obstructive pulmonary disease, and can make the disease worse, clinically difficult and flu. The difference in pneumonia caused by the virus, related pathogens and serological tests help to differentiate the diagnosis.

(4) Reye syndrome (Remy's syndrome) is occasionally seen in children under the age of 14, especially those who use salicylic acid and antipyretic analgesics such as aspirin. Mainly manifested as nausea, vomiting, followed by sleepiness, coma, convulsions and other neurological symptoms after fever, liver, no jaundice, cerebrospinal fluid examination is normal. The pathogenesis is unclear.

(5) Heart damage Heart damage is not common, mainly myocarditis, pericarditis. It can be seen that creatine kinase is elevated and electrocardiogram is abnormal, while troponin abnormality is rare and can be recovered. Heart failure can occur in severe cases.

(6) Neurological damage includes encephalomyelitis, transverse myelitis, aseptic meningitis, focal neurological disorders, acute infectious demyelinating polyneuropathy (Grincipal syndrome).

(7) Myositis and rhabdomyolysis syndrome are rare in the flu. The main symptoms are muscle weakness, renal failure, and elevated CK.