![]() SARS-CoV-2 infection (the virus that causes COVID-19)Īlthough the symptoms of viral and bacterial pneumonia are very similar, viral pneumonia is usually milder.human parainfluenza virus (HPIV) infection.Examples of viral infections that can cause pneumonia include: Respiratory viruses are often the cause of pneumonia. The most common cause of bacterial pneumonia is Streptococcus pneumoniae. Several types of infectious agents can cause pneumonia, including bacteria, viruses, and fungi. This inflammation can eventually cause the air sacs to fill up with pus and liquids, causing pneumonia symptoms. The immune system’s reaction to clear the infection results in inflammation of the lung’s air sacs (alveoli). Pneumonia happens when germs get into your lungs and cause an infection. A productive cough helps eject remaining fluid from the lungs. Immune cells have begun to clear the infection. The breakdown of red blood cells causes a change in color, from red to gray. The red blood cells have begun to break down while immune cells remain. This makes the lungs appear red and solid in appearance. Red bloods cells and immune cells have entered into the fluid. Fluid filled with infectious organisms has accumulated in the air sacs. Lobar pneumonia can be further divided into four stages based off how it’s progressed: Each lung is made of lobes, which are defined sections of the lung. Lobar pneumonia affects one or more lobes of your lungs. These are the tubes that lead from your windpipe to your lungs. It’s often localized close to or around your bronchi. Pneumonia may be classified based off the area of the lungs it’s affecting: Bronchopneumoniaīronchopneumonia can affect areas throughout both of your lungs. ![]() However, in walking pneumonia, the bacteria Mycoplasma pneumoniae most commonly causes the condition. Viruses and bacteria, like Streptococcus pneumoniae or Haemophilus influenzae, often cause pneumonia. The symptoms of walking pneumonia can include things like: However, walking pneumonia may require a longer recovery period. Their symptoms may feel more like a mild respiratory infection than pneumonia. People with walking pneumonia may not even know they have pneumonia. Walking pneumonia is a milder case of pneumonia. It’s more likely to occur if you have a swallowing problem, or if you’re too sedated from the use of medications, alcohol, or other drugs. Inhaling bacteria into your lungs from food, drink, or saliva can cause aspiration pneumonia. When people who are using a ventilator get pneumonia, it’s called VAP.
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