---
title: 'The World’s Deadliest Diseases'
source: 'https://youtube.com/watch?v=onFj_RD75nA'
video_id: 'onFj_RD75nA'
date: 2026-08-28
duration_sec: 72
channel: 'Kurzgesagt – In a Nutshell'
---

# The World’s Deadliest Diseases

> Source: [The World’s Deadliest Diseases](https://youtube.com/watch?v=onFj_RD75nA)

## Summary

This video provides a data-driven overview of the world's deadliest infectious diseases, ranking them by annual death toll and highlighting the often-overlooked economic burden they impose on the poorest communities. It concludes by advocating for investment in early detection, prevention, and affordable treatment as a dual strategy to save lives and stimulate economic growth.

### Key Points

- **Joint Fifth Place: Malaria and AIDS** [00:02] — Malaria and AIDS each kill approximately 600,000 people per year.
- **Diarrheal Diseases** [00:02] — Diarrheal diseases claim 1.1 million lives annually.
- **Tuberculosis and Hepatitis** [00:02] — Tuberculosis and hepatitis viruses each cause well over a million deaths per year.
- **Top Killer: Lower Respiratory Infections** [00:17] — Lower respiratory infections are the top infectious killers worldwide, causing around 2.5 million deaths annually.
- **Economic Burden of Disease** [00:30] — Malaria alone accounts for roughly 500 million lost working days in Africa each year. Sick days from tuberculosis add up to trillions of dollars in losses per decade.
- **Catastrophic Costs for the Poor** [00:43] — Over half of all tuberculosis sufferers spend more than 20% of their income just to get treated. A single infection can force families to sell livestock and fall into debt.
- **Breaking the Cycle Through Investment** [00:57] — Investing in early detection, prevention, and lowering treatment costs can break the cycle of disease and poverty. Every dollar invested saves lives and provides an economic boost, allowing previously disease-burdened regions to thrive.

### Conclusion

The video underscores that infectious diseases are not just a health crisis but a major economic one, particularly for the world's poorest. Strategic investment in healthcare can yield dual benefits: saving lives and fostering economic prosperity.

## Transcript

In joint fifth place are malaria and AIDS. Both kill around 600,000 people per year, followed by diarrheal diseases claiming [music] 1.1 million lives. tuberculosis and hepatitis viruses with each responsible for well over a million
deaths. But the top infectious killers worldwide claiming around 2.5 million lives a year are lower respiratory infections. Living with these diseases also drains people's time and money. Malaria alone is responsible for around
500 million lost working days in Africa a year, which is a heavy burden for global level, sick days from tuberculosis add [music] up to trillions of dollars a decade. But for the world's poorest, catastrophe can hit much
faster. Over half of all tuberculosis sufferers spend over 20% of their income [music] just to get treated. One infection can mean selling livestock, falling into debt. But [music] we can break this cycle by investing in early
detection and prevention. By lowering treatment costs and enabling [music] to live healthy lives, every dollar invested not only saves lives, but helps to give an economic boost so places once held back by disease can thrive.