pandemic

Zoonotic spillover explained: how viruses like SARS-CoV-2, HIV, Ebola, and MERS crossed from animals to humans — and why it keeps happening.

Where H5N1 stands in October 2026: 72 U.S. human cases, dairy cattle spread, what would signal pandemic risk, and what CDC says about milk and vaccines.

SARS-CoV-1 and MERS-CoV came from animals, spread in hospitals, and differ sharply in lethality. How each emerged, why SARS ended, and why MERS persists.

H5N1 bird flu explained: how avian influenza infects birds, cattle, and people, what the US dairy outbreak changed, and what the evidence says on risk.

Machine learning can scan news and travel data for outbreak signals, forecast cases weeks ahead, and track viral genomes. It cannot say when the next pandemic starts.

The Black Death killed a third of Europe. The 1918 flu killed more people than World War I. Epidemics have redirected history more than any army.

What decides how fast a disease spreads, how many people it kills, and which defenses work? The epidemiology of pandemics, from reproduction numbers to vaccines, with the 1918 flu and COVID-19 as test cases.

Some viruses kill almost everyone they infect. Others spread so fast they ignite global pandemics. Here are the most dangerous viruses on Earth and the science behind their lethality.