Is Pneumonia Contagious?

Pneumonia is inflammation and infection in the air sacs of the lungs. It may be caused by bacteria, viruses, or, less often, other organisms. The lung infection does not pass from person to person as a single condition in every case. Instead, a contagious germ may spread and cause anything from a mild respiratory illness to pneumonia, depending on the person’s health and immune response.

Viral illnesses such as COVID-19 and influenza can spread between people and may lead to pneumonia. Bacterial infections can also spread in some circumstances. A cough, fever, chills, or coughing up phlegm can occur with pneumonia, but these symptoms do not establish whether the illness is contagious or identify its cause.

If you have a new cough, fever, or another respiratory symptom, limit close contact while you arrange medical advice. Cover coughs and sneezes, wash your hands regularly, improve airflow indoors, and avoid sharing cups, utensils, or towels. A well-fitting mask can add protection when you must be near other people. Follow the treatment plan you are given, and take prescribed antibiotics exactly as directed; antibiotics do not treat viral infections.

People at higher risk from respiratory infections, including older adults, infants, and those with long-term lung or immune conditions, may need extra precautions. A clinician can help determine whether testing, examination, or treatment is appropriate.

Seek urgent medical help for trouble breathing, blue or grey lips, new confusion, severe chest pain, fainting, or marked drowsiness. These signs can indicate that the lungs or body are not receiving enough oxygen or that a serious infection is developing. Contact a healthcare professional promptly for a worsening cough, persistent fever, shaking chills, dehydration, or coughing up blood. Severe infection can sometimes progress to sepsis and needs rapid assessment.

Ask which cause is most likely, whether you need testing, how long to avoid close contact, and which symptoms should prompt urgent review. Tell the clinician about breathing changes, recent contact with someone ill, travel, long-term conditions, pregnancy, and medicines that affect immunity.