Talk about intracellular and extracellular bacteria.

We have obligate intracellular (these have no vaccines, like rickettsia, chlamydia,.... Facultative intracellular (Salmonelly, shigella, brucella, listeria, heliobacter... Extracellular (Streptococcus, E.coli, vibrio treponema...) And spore forming ; clostridium and bacillus