COVID-19 and influenza co-infection

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Main article: COVID-19

For COVID-19 frequently asked inpatient questions, click here

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Synonyms and keywords:

Historical Perspective

• COVID-19, also called Sever Acute Respiratory Distress Syndrome Coronavirus 2 (SARS-CoV-2) originated in Wuhan, China in late December 2019. It has caused a significant morbidity and mortality worldwide and has been declared a global pandemic by the WHO.
• Influenza occurs mainly during the winter, it is a highly contagious acute viral respiratory infection that causes significant morbidity and mortality worldwide.

Differentiating COVID-19 and Influenza co-infection from other Diseases

• Influenza and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. Influenza is caused by infection with influenza viruses and COVID-19 is caused by infection with the coronavirus (SARS-CoV-2). Testing may be needed to help confirm a diagnosis because some of the symptoms of flu and COVID-19 are similar. Influenza and COVID-19 share many characteristics, but there are some key differences between the two.

• This table compares the Influenza and COVID-19:

	Similarities	Differences
Signs and symptoms	- It can be vary from no symptoms to sever symptoms. Common symptoms include: Fever/chills, cough, shortness of breath, fatigue, sore throat, runny nose, muscle aches, headache, and gastrointestinal symptoms (vomiting and diarrhea).	- Change in or loss of taste or smell can be a sign of COVID-19.
Incubation period	- It takes one or more days for a person to get infected and develop symptoms after the exposure.	- It takes longer to develop symptoms in COVID-19 than Influenza.The time range can be vary in COVID-19, symptoms can appear early in 2 days or late in 14 days. In Influenza, symptoms may develop 2 to 4 days after infection.