nocardia asteroides nocardia asteroides nocardia asteroides is a species of nocardia. it can cause nocardiosis, a severe pulmonary infection in immunocompromised hosts. nocardia asteroides scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: mycobacteriales family: nocardiaceae genus: nocardia species: n. asteroides binomial name nocardia asteroides(eppinger 1891) blanchard 1896 (approved lists 1980)