World’s Smallest Organism

With a capsid diameter of mere 17 nm (0.00000067 inches or 0.000017 mm), the Porcine circovirus type 1 easily takes the title of the smallest organism in the world.

Considered as a non-living virus, it has a genome of just 1759 nucleotides.

Originally discovered back in 1974, it still remains as one of the simplest viruses known to man.

Smallest Organism

Smallest Organism in the World