Influenza infection is characterised by upper and lower respiratory tract symptoms of rhinorrhoea, cough, fever, chills, headache, and myalgia.
Typically presents in winter season.
Can occur in local community outbreaks, epidemics, and, rarely, pandemics.
Vaccination for prevention is available.
Acute respiratory tract infection typically caused by seasonal influenza A or B virus. The virus is transmitted by inhalation of infected respiratory secretions that have been aerosolised through coughing, sneezing, or talking.
History and exam
Cristine Radojicic, MD
Department of Pulmonary, Allergy and Critical Care
CR declares that she is on Advisory boards for CSL Behring and Speakers Bureau Biocryst.
Waleed Javaid, MD, FACP, FIDSA
Medical Director of Infection Control
Department of Medicine
SUNY Upstate Medical University
WJ declares that he has no competing interests.
Rachel L. Miller, MD, FAAAAI
Associate Professor of Clinical Medicine and Environmental Health Sciences
Columbia University College of Physicians and Surgeons
RLM declares that she has no competing interests.
Mark Sands, MD, FAAAAI
SUNY Buffalo School of Medicine
Division Allergy and Immunology
MS declares that he has no competing interests.
An De Sutter, MD, PhD
Department of General Practice and Primary Health Care
ADS declares that she has no competing interests.
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