1. The proto-mitochondrion was probably closely related to the Rickettsia.

2. Bunchy top Cause – Disease caused by Rickettsia bacteria transmitted by leafhoppers

3. NOTE 3: In the following table, the micro-organisms written in italics are bacteria, mycoplasmas, rickettsia or fungi.

4. The term pAthogen is usually restricted to living agents, which include viruses, rickettsia, bacteria, fungi, yeasts, …

5. H. punctata is known as reservoir and vector of tickborne spotted typhus Rickettsia siberica, Q fever and possible vector of Bhanja-virus, Tribeč-virus, and tickborne encephalitis virus.

6. 24 Rickettsia -like organism infections can lead to severe diseases and sometimes large death, which has become a restrictive factor in the development of marine mollusk industry in the world.

7. 23 The necessity, emphasis and difficulty for the research on the rickettsia-like organism of the marine mollusk were discussed, and the trend of the development on the research is given.