Although we often associate it with cold weather or older adults, pneumonia continues to be—year after year—one of the leading causes of preventable death worldwide. Every 20 seconds, someone dies from this disease, according to the WHO. And what’s most alarming: more than 2.5 million deaths each year could be avoided through prevention, early diagnosis, and access to vaccines.

But what makes it so dangerous?

Durante siglos, la neumonía ha sido una vieja conocida. De hecho, Hipócrates ya la describió hace más de 2.000 años. Pero en pleno siglo XXI, sigue cobrándose vidas, sobre todo entre los extremos de la edad.

For centuries, pneumonia has been a familiar threat. In fact, Hippocrates described it more than 2,000 years ago. Yet, even in the 21st century, it continues to claim lives—especially among those at the extremes of age:

• Children under 5 years old
• Adults over 65
• People with chronic or respiratory diseases

In Latin America, it accounts for thousands of hospitalizations each year, placing an increasing burden on healthcare systems.
And after the pandemic, the situation worsened: lingering respiratory effects from COVID-19 and an aging population have driven a rise in cases among older adults.

The culprits: bacteria, viruses, and fungi

There isn’t just one cause. The main agents include:

• Streptococcus pneumoniae → the most common cause of bacterial pneumonia.
• Haemophilus influenzae type b (Hib) → the second most frequent cause.
• Respiratory syncytial virus (RSV) → the leading cause in young children.
• Pneumocystis jiroveci → a dangerous fungus in infants with HIV.

While most infections spread through the respiratory route (coughing or sneezing), pneumonia can also be transmitted through the bloodstream—a lesser-known but critical route in maternal HIV transmission cases.

What factors increase the risk?

Sometimes, the environment causes more harm than the microbe itself.
Tobacco smoke, air pollution, and the use of biomass fuels (wood or charcoal) for cooking raise the risk in vulnerable households. Add to that overcrowding, poor ventilation, and child malnutrition, and you have the perfect storm.

The good news: pneumonia is preventable

Vaccines against pneumococcus and influenza save millions of lives every year.

Together with simple habits—handwashing, ventilating indoor spaces, avoiding tobacco, and seeking medical attention at the first symptoms—we can make a real difference. A hopeful fact: when diagnosed early, child mortality from pneumonia can be reduced by up to 42%.
Technology is joining the fight, too. AI-based tools can now interpret chest X-rays in seconds, detecting pneumonia patterns before symptoms worsen.

Recent advances also point to personalized treatments, faster diagnostics, and broader vaccine coverage. A study published in The Lancet proposes a groundbreaking approach led by Colombian scientists: using molecular amplification tests capable of identifying the pathogen’s genetic code with over 90% accuracy in under an hour.

This technology—similar to PCR tests used during the COVID-19 pandemic—can pinpoint the microorganism causing the infection within the first 72 hours, allowing for targeted antibiotic treatments, avoiding unnecessary medication, and reducing hospital stays. Additionally, new respiratory health apps help track cough, fever, and shortness of breath—alerting users to early signs of complications. Health, quite literally, in the palm of your hand.

Pneumonia knows no age or nationality. But in a world where science and technology are advancing at an unprecedented pace, preventing it is within our reach. This November 12th, the message is clear: let's protect our lungs and those of the people who need it most.