What type of infection causes pneumonia?

Viruses, bacteria, and fungi can all cause pneumonia. In the United States, common causes of viral pneumonia are influenza, respiratory syncytial virus (RSV), and SARS-CoV-2 (the virus that causes COVID-19). A common cause of bacterial pneumonia is Streptococcus pneumoniae (pneumococcus).

What is infective pneumonia?

Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing. A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia.

What’s the worst type of pneumonia?

Types of pneumonia that carry a higher risk

• Viral. Viral pneumonia is typically a milder disease and symptoms occur gradually.
• Bacterial. These pneumonias are often more severe.
• Fungal. Fungal pneumonia is typically more common in people with a weakened immune system and these infections can be very serious.

What is the most serious type of pneumonia?

Bacterial pneumonia can be serious and lead to complications including bacteremia, a bacteria blood infection also known as septic shock. Bacterial infections can progress quickly, so don’t hesitate to seek help if your symptoms worsen.

Are there any cases of rapidly fatal hemorrhagic pneumonia?

We report 3 cases of rapidly fatal, hemorrhagic pneumonia in previously healthy patients that were determined to be caused by infection with hypervirulent GAS. Patient 1 was a 74-year-old Italian man who came to the emergency department (ED) of Vittorio Emanuele Hospital in Catania, Italy, in July 2012.

Can a hypervirulent Emm 1 gas clone cause pneumonia?

The hypervirulent emm 1 GAS clone also harbors prophages encoding SpeA proteins and extracellular streptodornase D (Sda1), which can also enhance virulence and dissemination ( 8,10). We report 3 cases of rapidly fatal, hemorrhagic pneumonia in previously healthy patients that were determined to be caused by infection with hypervirulent GAS.

Are there any negative results for Legionella pneumophila?

Results of testing for urinary Legionella pneumophila and S. pneumoniae antigens, β-glucan, galactomannan, and HIV and toxicology panels were negative for all 3 patients. Commercially available PCRs for respiratory tract samples showed negative results for major respiratory viruses and bacterial pathogens.