Number and percentage (in parentheses) of composts and bioaerosol pools containing free-living amoebae (FLA) species recovered by culture in the four composting facilities (CF).

0: FLA not detected;1FLA supporting intracellular growth of Legionella[9], [33];2opportunistic pathogenic FLA [33]; * Echinamoeba thermatum has a nucleotide identity of 75% with a corresponding database entry, which presumably is even not sufficient for a reliable identification at the genus level.