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Having green, yellow, or thickened phlegm (sputum) does not always indicate the presence of an infection. Also, if an infection is present, the color of the phlegm (sputum) does not determine whether a virus, a bacterium or another pathogen has caused it. Simple allergies can also cause changes in the color of the mucus. [1]
Mucus is actually the body's first line of defense against bacterial and viral infections. One of the proteins found in mucus — the antibody IgA — protects against pathogens in your nose and ...
A cold is an infection caused by over 200 respiratory viruses, but the most common is a virus known as rhinovirus. ... yellow or green mucus. ... The cough, runny nose and congestion start to ...
Most healthy people who have mild symptoms like runny nose, congestion and fatigue do not need to seek medical care. More than 200 viruses cause the common cold, which is more than likely the ...
Phlegm is a thick secretion in the airway during disease and inflammation. Phlegm usually contains mucus with virus, bacteria, other debris, and sloughed-off inflammatory cells. Once phlegm has been expectorated by a cough, it becomes sputum. [2]
A postinfectious cough is a lingering cough that follows a respiratory tract infection, such as a common cold or flu and lasting up to eight weeks. Postinfectious cough is a clinically recognized condition represented within the medical literature.
“Some mucus is normal, which the body clears through periodic coughing—and sometimes we have excess mucus production with acute respiratory infections,” she explains. Other causes can ...
A number of the viruses that cause the common cold may also result in asymptomatic infections. [25] [26] The color of the mucus or nasal secretion may vary from clear to yellow to green and does not indicate the class of agent causing the infection. [27]