Still, the 17th-century variola virus DNA detected by Duggan and colleagues is the oldest definitive trace of smallpox that researchers have found.

The document notes that the delta variant, which was first detected in India, causes infections that are more contagious than the common cold, flu, smallpox and Ebola virus.

After the first observations of life under the microscope, it took two centuries of research before the 'cell theory', the idea that all living things are composed of cells or their products, was ...

Viruses Under the Super Microscope: How Influenza Viruses Communicate With Cells May 7, 2025 — Influenza viruses are among the most likely triggers of future pandemics.