Pneumonia

Pneumonia is a leading cause of death and hospitalization, costing health care systems billions of dollars and an estimated 600,000 adult deaths worldwide each year. Pneumococcal disease is caused by the bacterium Streptococcus pneumoniae and the term describes a group of illnesses, including invasive infections, such as bacteremia/sepsis and meningitis, as well as pneumonia and upper respiratory tract infections. Although all age groups may be affected, the highest rate of pneumococcal disease occurs in young children and older adults. In addition, persons suffering from a wide range of chronic conditions (eg, diabetes, cardiovascular disease) and immune deficiencies are at increased risk.

Viral vs Bacterial Pneumonia

Pneumonia is an infection of one or both lungs which affects alveoli. This article looks at the differences between bacterial and viral pneumonia.

Pneumonia Symptoms & Risk Factors

Pneumonia Classification

Pneumonia Cause

Pneumonia in Children

Pneumonia Diagnosis

Pneumonia Treatment

Pneumonia Epidemiology

Pneumonia History

Walking Pneumonia

Is Walking Pneumonia Contagious?

Walking Pneumonia versus Pneumonia

See more featured articles »

Walking Pneumonia Versus Common Cold

Walking Pneumonia Versus Bronchitis

Who Gets Walking Pneumonia?

Types of Atypical Pneumonia

How is Walking Pneumonia Treated?

Walking Pneumonia: When to See a Doctor?

Risk Factors and Walking Pneumonia Prevention

Is Sense of Smell Linked to Pneumonia?

Latest Pneumonia News and Research

Disrupted body clocks raise risk of early death, study finds

A large cohort study from China and the U.S. shows that Circadian Syndrome (CircS)—a cluster of metabolic and behavioral disruptions—is linked to higher all-cause and cause-specific mortality. The risk increases with the number of CircS components, especially among adults aged 40–60.

29 Apr 2025

Measles makes a deadly comeback in Europe as vaccine gaps widen

In 2024, measles cases in Europe soared to the highest levels in decades, with over 35,000 reported cases, 87% from Romania alone. Most affected were unvaccinated children, revealing critical immunity gaps and suboptimal vaccination coverage across the EU/EEA.

29 Apr 2025

New antibiotic offers hope for more effective Lyme disease treatment

Lyme disease, a disease transmitted when deer ticks feed on infected animals like deer and rodents, and then bite humans, impacts nearly half a million individuals in the U.S. annually.

24 Apr 2025

Research offers new hope in the fight against antibiotic-resistant bacteria

Antibiotic resistance is a serious threat to public health. When antibiotics don't work, we risk not being able to treat many types of infections and people who would previously have been cured, can die.

23 Apr 2025

Clinical AI tool scores highest yet on the United States Medical Licensing Exam

A powerful clinical artificial intelligence tool developed by University at Buffalo biomedical informatics researchers has demonstrated remarkable accuracy on all three parts of the United States Medical Licensing Exam (Step exams), according to a paper published today (April 22) in JAMA Network Open.

22 Apr 2025

Why measles is resurging in vulnerable countries despite global progress

Global measles incidence, mortality, and DALY rates in children under five dropped significantly from 1990 to 2021. However, the COVID-19 pandemic disrupted vaccination efforts, leading to coverage declines and elevated outbreak risks in low-SDI regions.

17 Apr 2025

Pediatricians warn of measles resurgence and emphasize vaccine safety

Pediatric infectious diseases experts stress the importance of vaccination against measles, one of the most contagious viruses, which is once more spreading in the United States.

15 Apr 2025

Why measles is back in the U.S. and what doctors must know now

Measles is making a troubling comeback in the U.S., driven by declining vaccination rates and rising vaccine hesitancy. Pediatric infectious disease experts provide clinical guidance to help healthcare providers recognize, manage, and prevent measles in today’s outbreak-prone environment.

14 Apr 2025

RSV-associated infections linked to higher one year mortality in adults

A major study presented today at ESCMID Global 2025 has revealed that adults with respiratory syncytial virus-associated acute respiratory infection (RSV-ARI) face a 2.7-fold higher risk of death within one year compared to the general population.

11 Apr 2025

Exophiala pneumonia identified in immunocompetent woman with lung disease

Exophiala, a genus of saprotrophic black fungi commonly found in the environment, is typically associated with cutaneous infections in immunocompromised hosts and rarely manifests as pneumonia.

9 Apr 2025

New guidelines aim to improve diagnosis and treatment of mycoplasma pneumoniae in children

The Chinese Medical Association has released new guidelines for diagnosing and treating Mycoplasma pneumoniae in children.

7 Apr 2025

New antibody research sparks hope for better whooping cough vaccines

Whooping cough, or pertussis, was once a leading cause of death for children in the U.S. and worldwide before the introduction of vaccines in the 1940s.

7 Apr 2025

New insights into bacterial defense mechanisms could help combat antibiotic resistance

Antibiotic resistance is a global health challenge that could overtake cancer mortality within a few decades.

4 Apr 2025

New drug strategy targets Staphylococcus aureus toxin to treat pneumonia

Pneumonia caused by the bacterium Staphylococcus aureus is one of the most dangerous infections that can occur in hospital.

2 Apr 2025

AI predicts bacterial resistance to antibiotics with high accuracy

An AI model trained on large amounts of genetic data can predict whether bacteria will become antibiotic-resistant.

2 Apr 2025

Montana may start collecting immunization data again amid US measles outbreak

When epidemiologist Sophia Newcomer tries to evaluate how well Montana might be able to ward off the measles outbreak spreading across the U.S., she doesn't have much data to work with.

1 Apr 2025

UTA expert discusses the latest developments of measles outbreak in Texas

Measles is a highly contagious disease that was declared eliminated from the U.S. by the World Health Organization 25 years ago due to the success of vaccination efforts.

28 Mar 2025

Report shows alarming measles resurgence in Europe and US

A recent report shows cases of measles across the World Health Organization's European Region, which includes the UK, are the highest they've been for more than 25 years. At the same time, large outbreaks of measles in the US have led to the first measles deaths there since 2015.

26 Mar 2025

Funding cuts endanger decades of progress in reducing child deaths and stillbirths

The number of children dying globally before their fifth birthday declined to 4.8 million in 2023, while stillbirths declined modestly, still remaining around 1.9 million, according to two new reports released today by the United Nations Inter-agency Group for Child Mortality Estimation (UN IGME).

25 Mar 2025

Long-term inhaled corticosteroids linked to increased health risks in COPD patients

Inhaled corticosteroids (ICS) are commonly prescribed for chronic obstructive pulmonary disease (COPD), but not recommended as first-line treatment unless patients have asthma/COPD overlap or frequent exacerbations.

24 Mar 2025