| Predominant phyla in average community compositions were Firmicutes, Actinobacteria and Bacteriodetes with no significant change in phylum level before and after intervention. |
| The most important microbes in the Amazon River are Actinobacteria, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria and Crenarchaeota. |
| The Gram stain identifies the bacterial groups Firmicutes and Actinobacteria, both of which contain many significant human pathogens. |
