Viruses, Rickettsia, Brucellae and some other bacteria can also be cultured in 6 to 12 days old chicken embryo.
This is because these viruses and bacterias cannot be cultured on artificial bacteriological culture media. They are obligate intracellular parasites, so they need LIVING HOST CELLS for propagation.
Location : Microbiology Department, MSMU, Moscow.
Groups : 95 , 96