Why is it that although Nocardia spp.grow well on most common nonselective laboratory media, many are missed when the cultures are read?

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These organisms show an oxidative type of metabolism, and as a genus, they use a wide variety of sugars.They do not require specific growth factors as do Haemophilus and Francisella organisms.Nocardia spp.grow well on most common nonselective laboratory media incubated at temperatures between 25° C and 37° C, although 3 to 6 days or longer may pass before growth is seen.Most cultures are read for 48 hours, then the plates are discarded.

Why Is It That Although Nocardia Spp