1 | Most of these diseases are caused by protozoa , bacteria, or viruses. | |
2 | At this concentration, control of protozoan parasites can be achieved. | |
3 | The parasites concerned are protozoa belonging to the Trypanosoma genus. | |
4 | Viruses are already known to infect animals, plants, fungi, protozoa, archaea, and bacteria. | |
5 | These microscopic bacteria and protozoa break down cellulose and fiber into digestible nutrients. |