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Infectivity can begin four to five days before the onset of symptoms. [7] Infected people can spread the disease even if they are pre-symptomatic or asymptomatic. [8] Most commonly, the peak viral load in upper respiratory tract samples occurs close to the time of symptom onset and declines after the first week after symptoms begin. [8]
People with the same infection may have different symptoms, and their symptoms may change over time. Three common clusters of symptoms have been identified: one respiratory symptom cluster with cough, sputum , shortness of breath, and fever; a musculoskeletal symptom cluster with muscle and joint pain, headache, and fatigue; a cluster of ...
Circumstances influencing the spread of droplets containing infectious particles can include pH, salinity, wind, air pollution, and solar radiation as well as human behavior. [27] Airborne infections usually land in the respiratory system, with the agent present in aerosols (infectious particles < 5 μm in diameter). [28]
Flu symptoms may appear within one to four days of infection, while COVID-19 symptoms may appear up to 14 days after infection. COVID-19 can be contagious for longer than the flu and may include ...
Here’s your guide on what to expect when it comes to flu, the common cold, COVID-19 and more, including symptoms and treatment options. Click on the links below to jump ahead to a certain fall ...
For flu, people are usually prescribed antiviral medications like oseltamivir (Tamiflu) or balaxovir (Xofluza); For COVID-19, nirmatrelvir/ritonavir (Paxlovid) is usually used, he says.
A routine chest X-ray is not always necessary for people who have symptoms of a lower respiratory tract infection. [4] Influenza affects both the upper and lower respiratory tracts. [citation needed] Antibiotics are the first line treatment for pneumonia; however, they are neither effective nor indicated for parasitic or viral infections. Acute ...
The flu vaccination rate so far this year is 42% for adults and 43% for children, compared with 47% and 57%, respectively, the previous season. Just 18% of adults and 8% of eligible children have ...