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2. Influenza - Wikipedia

   en.wikipedia.org/wiki/Influenza

   Pneumonia may be caused by the primary viral infection or a secondary bacterial infection. Primary pneumonia is characterized by rapid progression of fever, cough, labored breathing, and low oxygen levels that cause bluish skin. It is especially common among those who have an underlying cardiovascular disease such as rheumatic heart disease.

3. How dangerous is flu? What to know about symptoms [Video] - AOL

   www.aol.com/news/dangerous-flu-know-symptoms...

   Bacterial pneumonia may develop when the flu virus spreads to the lower respiratory tract, leading to breathing difficulties that may require supplemental oxygen. Warning signs of pneumonia .

4. It's Cold & Flu Season: Here's How to Tell if Your Senior ...

   www.aol.com/cold-flu-season-heres-tell-165900863...

   Causes of pneumonia in the elderly. Pneumonia can be caused by a buildup of bacteria, viruses, or fungi in the lungs. There are several types of bacteria that can cause pneumonia, some typical and ...

5. 3 Ways to Tell the Difference Between the Flu and Pneumonia - AOL

   www.aol.com/news/3-ways-tell-difference-between...

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6. Lower respiratory tract infection - Wikipedia

   en.wikipedia.org/wiki/Lower_respiratory_tract...

   Lower respiratory tract infection (LRTI) is a term often used as a synonym for pneumonia but can also be applied to other types of infection including lung abscess and acute bronchitis. Symptoms include shortness of breath , weakness, fever , coughing and fatigue. [ 3 ]

7. Flu season - Wikipedia

   en.wikipedia.org/wiki/Flu_season

   Flu vaccination is also strict for lung cancer patients, as cancer leads to complications of pneumonia and bronchitis. People with cancer should not receive the nasal spray vaccine. The flu shot is made up of inactivated (killed) viruses, and the nasal spray vaccines are made up of live viruses.

8. What You Need To Know About the Cold and Flu Season

   www.aol.com/know-cold-flu-season-141800126.html

   During the 2021-2022 flu season, the flu vaccine was about 36% effective, the CDC estimates. Year to year, numbers can vary widely because officials have to guess which kinds of flu viruses will ...

9. Pneumonia - Wikipedia

   en.wikipedia.org/wiki/Pneumonia

   Pneumonia fills the lung's alveoli with fluid, hindering oxygenation. The alveolus on the left is normal, whereas the one on the right is full of fluid from pneumonia. Pneumonia frequently starts as an upper respiratory tract infection that moves into the lower respiratory tract. [55] It is a type of pneumonitis (lung inflammation). [56]