Clinical manifestations, treatment and outcomes of patients infected with Mycobacterium haemophilum with a focus on immune reconstitution inflammatory syndrome: a retrospective multi-site study

M. haemophilum infection should be considered among patients receiving immunomodulatory therapy who develop discoloured or nodular skin lesions involving the extremities, worsening focal arthritis, tenosynovitis, or isolated adenopathy. A heightened awareness of this pathogen's clinical and laboratory characteristics can lead to a timely diagnosis and favourable outcome.