Tropheryma whipplei is the causative agent for Whipple's disease. It could not be cultured until recently when the genomic data showed:
a. it was auxotrophic for some amino acids
b. that it was an obligate intracellular pathogen
c. it needed a helper virus to grow
d. that it needed high levels of iron
e. that it is a virus that needed cell culture
Answer: it was auxotrophic for some amino acids
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