What is pneumonia?
Pneumonia is an infection in one or both of the lungs. It causes the air sacs of the lungs to fill up with fluid or pus. It can range from mild to severe, depending on the type of germ causing the infection, your age, and your overall health.What causes pneumonia?
Bacterial, viral, and fungal infections can cause pneumonia.
Bacteria are the most common cause. Bacterial pneumonia can occur on its own. It can also develop after you've had certain viral infections such as a cold or the flu. Several different types of bacteria can cause pneumonia, including:
Viruses that infect the respiratory tract may cause pneumonia. Viral pneumonia is often mild and goes away on its own within a few weeks. But sometimes it is serious enough that you need to get treatment in a hospital. If you have viral pneumonia, you are at risk of also getting bacterial pneumonia. The different viruses that can cause pneumonia include:
Fungal pneumonia is more common in people who have chronic health problems or weakened immune systems. Some of the types include:
Anyone can get pneumonia, but certain factors can increase your risk:
The symptoms of pneumonia can range from mild to severe and include:
The symptoms can vary for different groups. Newborns and infants may not show any signs of the infection. Others may vomit and have a fever and cough. They might seem sick, with no energy, or be restless.
Older adults and people who have serious illnesses or weak immune systems may have fewer and milder symptoms. They may even have a lower than normal temperature. Older adults who have pneumonia sometimes have sudden changes in mental awareness.What other problems can pneumonia cause?
Sometimes pneumonia can cause serious complications such as:
Sometimes pneumonia can be hard to diagnose. This is because it can cause some of the same symptoms as a cold or the flu. It may take time for you to realize that you have a more serious condition.
Your health care provider may use many tools to make a diagnosis:
If you are in the hospital, have serious symptoms, are older, or have other health problems, you may also have more tests, such as:
Treatment for pneumonia depends on the type of pneumonia, which germ is causing it, and how severe it is:
You may need to be treated in a hospital if your symptoms are severe or if you are at risk for complications. While there, you may get additional treatments. For example, if your blood oxygen level is low, you may receive oxygen therapy.
It may take time to recover from pneumonia. Some people feel better within a week. For other people, it can take a month or more.Can pneumonia be prevented?
Vaccines can help prevent pneumonia caused by pneumococcal bacteria or the flu virus. Having good hygiene, not smoking, and having a healthy lifestyle may also help prevent pneumonia.
NIH: National Heart, Lung, and Blood Institute
What is Pneumocystis jirovecii?
Pneumocystis jirovecii is a fungus that is common throughout the world. Many people have been exposed to it as children. Some people have the fungus in their lungs. If you are healthy, it usually will not make you sick. But it can make you sick if you have a weakened immune system, for example if you:
Pneumocystis jirovecii can spread from person to person through the air. You can spread it to others even if it isn't making you sick.What is pneumocystis pneumonia (PCP)?
The most common type of infection that Pneumocystis jirovecii causes is pneumocystis pneumonia (PCP). Pneumonia is an infection in one or both of the lungs. It causes the air sacs of the lungs to fill up with fluid or pus.What are the symptoms of pneumocystis pneumonia (PCP)?
The symptoms of PCP can develop over several days or weeks. They may include:
Contact your healthcare provider if you have symptoms that you think are related to PCP. Since PCP can be life-threatening, it's important to get early treatment.How is pneumocystis pneumonia (PCP) diagnosed?
To find out if you have PCP, your provider will take a sample of fluid or tissue from your lungs. You may cough up the sample (called sputum), have fluid collected during a bronchoalveolar lavage, or have tissue taken with a biopsy. They will send the sample to the lab to check for Pneumocystis.What are the treatments for pneumocystis pneumonia (PCP)?
The treatment for PCP is with antibiotics, either by mouth or intravenously (by IV). You need to take them for about 3 weeks. If you have a severe case of PCP, you might need treatment in the hospital.Can pneumocystis pneumonia (PCP) be prevented?
There is no vaccine to prevent PCP. Some people who are at high risk of getting PCP may need to take antibiotics to prevent it.
Centers for Disease Control and Prevention
Legionnaires' disease is a type of pneumonia caused by bacteria. You usually get it by breathing in mist from water that contains the bacteria. The mist may come from hot tubs, showers, or air-conditioning units for large buildings. The bacteria don't spread from person to person.
Symptoms of Legionnaires' disease include high fever, chills, a cough, and sometimes muscle aches and headaches. Other types of pneumonia have similar symptoms. You will probably need a chest x-ray to diagnose the pneumonia. Lab tests can detect the specific bacteria that cause Legionnaires' disease.
Most people exposed to the bacteria do not become sick. You are more likely to get sick if you:
Legionnaires' disease is serious and can be life-threatening. However, most people recover with antibiotic treatment.
Centers for Disease Control and Prevention
Having HIV/AIDS weakens your body's immune system. It destroys the white blood cells that fight infection. This puts you at risk for opportunistic infections (OIs). OIs are serious infections that take advantage of your weak immune system. These infections are less common and less severe in healthy people.
There are many types of OIs:
Having HIV/AIDS can make infections harder to treat. People with HIV/AIDS are also more likely to have complications from common illnesses such as the flu.
You can help prevent infections by taking your HIV/AIDS medicines. Other things that can help include practicing safe sex, washing your hands well and often, and cooking your food thoroughly.
What are Staphylococcal (staph) infections?
Staphylococcus (staph) is a group of bacteria. There are more than 30 types. A type called Staphylococcus aureus causes most infections.
Staph bacteria can cause many different types of infections, including:
Some people carry staph bacteria on their skin or in their noses, but they do not get an infection. But if they get a cut or wound, the bacteria can enter the body and cause an infection.
Staph bacteria can spread from person to person. They can also spread on objects, such as towels, clothing, door handles, athletic equipment, and remotes. If you have staph and do not handle food properly when you are preparing it, you can also spread staph to others.Who is more likely to get a staph infection?
Anyone can develop a staph infection, but certain people are more likely to get one, including those who:
The symptoms of a staph infection depend on the type of infection:
Your health care provider will do a physical exam and ask about your symptoms. Often, providers can tell if you have a staph skin infection by looking at it. To check for other types of staph infections, providers may do a culture, with a skin scraping, tissue sample, stool sample, or throat or nasal swabs. There may be other tests, such as imaging tests, depending on the type of infection.What are the treatments for staph infections?
Treatment for staph infections is antibiotics. Depending on the type of infection, the antibiotics might be a cream, ointment, medicines (to swallow), or intravenous (IV) medicine. If you have an infected wound, your provider might drain it. Sometimes you may need surgery for bone infections.
Some staph infections, such as MRSA (methicillin-resistant Staphylococcus aureus), are resistant to many antibiotics. There are still certain antibiotics that can treat these infections.Can staph infections be prevented?
Certain steps can help to prevent staph infections:
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