Rickettsia
Rickettsia
- Rickettsia is a
genus of non-motille,gram negative , non spore forming,highly pleomorphic
bacteria
- It may be present as cocci, rods or thread like .
- It is obligate intracellular parasite & its survival
depends on entry, growth & replication within the cytoplasm of
eukaryotic host cells
- Rickettsia cannot
live in artificial nutrient environment & are grown either in tissue or
embryonic culture
- Rickettsia bacteria are susceptible to antibiotics of
tetracycline group
- Earlier they are placed in between viruses & true bacteria
- They are associated many of animal disease like African tick
bite fever, Rocky mountain fever &
many plant disease like Citrus green bacterium, peach phony RLO etc
- Rickettsia can
grow inside living cell like viruses, also thought that they are closest living
relatives to bacteria because of origin of mitochondria organelle that exist inside eukaryotic cell
mostly
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