Cryptosporidium hominis

Johnson et al. 2005 · 254 nm

Protozoan cyst / oocyst Water 254 nm Protozoan cyst

Test conditions & context

Type Protozoan cyst / oocyst

Medium Water

Test wavelength 254 nm

Particle size 5000 nm

Author Johnson et al.

Year 2005

Aus der IUVA-Malayeri-2016-Fluence-Kompilation. Primärstudie: Johnson et al. 2005 (Zellkultur-Infektiositäts-Assay), LP-Hg 254 nm — die humanspezifische Cryptosporidium-Art (vs. zoonotisches C. parvum). UV-empfindlich, aber chlor- und ozonresistent.

UV-C dose–response (D-values)

A D-value is the UV-C dose (in mJ/cm²) needed for a given log-reduction. D90 = 90 % inactivation = 1-log; D99 = 99 % = 2-log; D99.9 = 99.9 % = 3-log, and so on. Values come from the cited study under its specific test conditions.

Reduction log Dose (mJ/cm²)

D90 90 % 1-log 3 mJ/cm²

D99 99 % 2-log 5.8 mJ/cm²

Morphology & UV-C resistance

Morphology class Protozoan cyst

Oozyste mit dicker Wand — UV-empfindlich (DNA-Schaden genügt, da keine Replikation in der Zyste), aber chlor- und ozonresistent → UV ist die bevorzugte Inaktivierungsmethode für Cryptosporidium.

Primary source

Johnson et al. (2005). iuva.org/resources/Resource%20Documents/Malayeri-Fluence%20Required%20to%20Achieve%20Incremental%20Log%20Inactivation%20of%20Bacteria%2C%20Protozoa%2C%20Viruses%20and%20Algae.pdf

← UV-C germ database