Viruses
Viruses are the smallest forms of micro-organisms capable of causing disease, particularly those of faecal origin that are infectious to humans through waterborne transmission.
Some examples: Poliovirus, Norovirus, Rotavirus
Focus on Norovirus
The Norovirus genus, ranging in size from 0.027 to 0.038 µm, groups together infectious agents responsible for the most frequent form of acute gastroenteritis in humans of all ages.

Focus on Rotavirus
Rotavirus (0.070 µm) is one of the main causes of acute viral gastroenteritis worldwide, particularly in infants and young children. It is transmitted mainly by the fecal-oral route, via contaminated water or food.
It is highly contagious and persists in the water for several weeks.
Focus on Bacteriophage MS2
Bacteriophages use bacteria as hosts for replication. Bacteriophage MS2 is a small virus that particularly infects E. coli. It has an RNA genome. Because of its small size and simplicity, it is often used in scientific research and to evaluate disinfection methods in the water industry.
Test conducted by
Lille Pasteur Institute (April 2025)
Test conditions
Water artificially contaminated with Norovirus murine strain S99 Berlin (MNV-1) with a concentration of 10⁵ TCID50/mL infectious doses.
Conclusion
ÖKO filter bottles filter out an average of 99.982% of murine Norovirus (MNV-1) from contaminated water.
Test conducted by
Lille Pasteur Institute (April 2025)
Test conditions
Water artificially contaminated with simian Rotavirus strain SA-11 with a concentration of 10⁵ TCID50/mL infectious doses.
Bacteria retention
ÖKO water bottles filter out an average of 99.992% of simian Rotavirus (SA-11) from contaminated water.
Test conducted by
Lille Pasteur Institute (April 2025)
Test conditions
Water artificially contaminated with Norovirus murine strain S99 Berlin (MNV-1) with a concentration of 10⁵ TCID50/mL infectious doses.
Conclusion
ÖKO filter bottles filter out an average of 99.982% of murine Norovirus (MNV-1) from contaminated water.
Test conducted by
Lille Pasteur Institute (April 2025)
Test conditions
Water artificially contaminated with simian Rotavirus strain SA-11 with a concentration of 10⁵ TCID50/mL infectious doses.
Bacteria retention
ÖKO water bottles filter out an average of 99.992% of simian Rotavirus (SA-11) from contaminated water.