This is the 8726th most frequent French word.
bactérienne
Relating to bacteria.
Here, 'bactérienne' modifies 'infection', detailing the type of infection, which pertains to bacteria.
Une infection bactérienne peut causer plusieurs maladies.
A bacterial infection can cause several illnesses.
In this sentence, 'bactérienne' describes 'contamination', indicating that the nature of the contamination is related to bacteria.
La contamination est souvent bactérienne dans ces environnements.
The contamination is often bacterial in these environments.
Here, 'bactérienne' characterizes 'propagation', expanding on the type of spread, which involves bacteria.