Both cause respiratory disease, yet there are important differences between the two viruses and how they spread. This has important implications for the public health measures that can be implemented to respond to each virus. That is, they both cause respiratory disease, which presents as a wide range of illness from asymptomatic or mild through to severe disease and death. Secondly, both viruses are transmitted by contact, droplets and fomites. As a result, the same public health measures, such as hand hygiene and good respiratory etiquette coughing into your elbow or into a tissue and immediately disposing of the tissue, are important actions all can take to prevent infection. The speed of transmission is an important point of difference between the two viruses. Influenza has a shorter median incubation period the time from infection to appearance of symptoms and a shorter serial interval the time between successive cases than COVID virus. The serial interval for COVID virus is estimated to be days, while for influenza virus, the serial interval is 3 days. Further, transmission in the first days of illness, or potentially pre-symptomatic transmission —transmission of the virus before the appearance of symptoms — is a major driver of transmission for influenza.
It looks like flu. It feels like flu. It even puts patients into the hospital like flu can. The virus is called adenovirus, and it can cause very severe flu-like symptoms.
Is it the flu, a cold or the new coronavirus? Patients and doctors alike are parsing signs of illness to figure out who needs what tests or care and how worried they should be. And why are we responding to them so differently? COVID, the disease caused by the new coronavirus, is a flu-like illness that has killed a small fraction of the number of people that the flu kills every year. Through the first four months of the outbreak, coronavirus has killed about 4, people. Flu kills , to , every year around the world, according to the World Health Organization. To some, that comparison seems comforting because flu is such a familiar foe. Think about that!
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