influenza flu virus the nasal mucosa lines closeup view illustration |
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| navigate by keyword : influenza infection viral covid vaccine flu type iav ibv nasal mucosa lines contagious cough pain fatigue runny nose sore throat diarrhea vomiting aches muscle disease sickness lung ill sick illness fever catarrh symptom dejected respiratory epihtelium air filled spaces respiration cavity mucous membrane tract receptor dust snoke pollen thermometer epidemics h1n1 h3n2 pcr nucleic acid |
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| Influenza (or the flu) is a highly contagious, acute viral infection that spreads easily from person to person. Influenza is most often caused by type A or B influenza viruses that infect the upper airways and lungs. |
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