Giardia (Trophozoite)
15 µm
Trophozoite length
The single-celled gut parasite whose two nuclei look like eyes. 10 to 20 µm long.
Published
How big is that?
15 µm is 1.9 times a red blood cell and 21% of the width of a human hair.
Giardia is the 7th smallest of the 32 Tiny Worlds objects, and the 7th smallest of the 172 objects across all five SizeItUp games.
Size comparison
To scale, smallest to largest: Giardia in orange beside the Tiny Worlds objects nearest in size, in teal.
| Object | Size | vs Giardia |
|---|---|---|
| Red blood cellA human red blood cell: a disc dimpled in the middle. | 7.7 µm across | 51% of the size |
| Neutrophil (White blood cell)The most common white blood cell, with its lobed nucleus. | 10.5 µm across | 70% of the size |
| Giardia (Trophozoite) | 15 µm long | – |
| Pollen grain (Opium poppy)A single grain of poppy pollen, with its three furrows. | 30.2 µm across | 2× bigger |
| Human hair (Width)A strand of scalp hair, measured across. | 70 µm across | 4.7× bigger |
In other units
| Micrometres | 15 |
|---|---|
| Millimetres | 0.015 |
| Metres | 0.000015 |
How it's measured
Trophozoite length. Midpoint of 10 to 20 µm (US CDC).
The source gives a range, so this is the middle of it.
Sources
- cdc.gov: US CDC DPDx: trophozoites measure 10-20 micrometers in length.
Checked against the source on .
Could you have guessed it by eye?
Giardia is one of the objects in Tiny Worlds, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.