![Paenibacillus larvae in a beehive.](http://static.sciencelearn.org.nz/images/images/000/005/036/full/RD16_ART_05__SniffingOutAmericanFoulbroodDiseaseWithDogs_ThreadTest.jpg?1674177026)
Cells (the small closed spaces created from wax from bees) in a beehive that are suspected of being infected with American foulbrood disease can be assessed with a matchstick where the colour, consistency and thread-like behaviour of the contents are observed.