De or het legionellabesmetting?

The correct Dutch article is:

de legionellabesmetting

Rule Words ending in -ing: almost always de. See the rule

How to use legionellabesmetting

the legionellabesmettingde legionellabesmetting
this legionellabesmettingdeze legionellabesmetting
that legionellabesmettingdie legionellabesmetting
our legionellabesmettingonze legionellabesmetting
your legionellabesmettingjouw legionellabesmetting
every legionellabesmettingelke legionellabesmetting
which legionellabesmetting?welke legionellabesmetting?
a big legionellabesmetting / the big legionellabesmettingeen grote legionellabesmetting, de grote legionellabesmetting