[First case report of Gordonia aichiensis bacteremia]

Focusing on Gordonia Infections: Distribution, Antimicrobial Susceptibilities and Phylogeny

The immunosuppression conditions and the presence of medical devices in patients favor the Gordonia infections. However, the features of this aerobic actinomycete have been little explored. Strains (n = 164) were characterized with 16S rDNA and secA1 genes to define their phylogenetic relationships, and subjected to broth microdilution to profile the antimicrobial susceptibilities of Gordonia species that caused infections in Spain during the 2005-2021 period. Four out of the eleven identified species were responsible for 86.0% of the infections: Gordonia sputi (53.0%), Gordonia bronchialis (18.3%), Gordonia terrae (8.5%) and Gordonia otitidis (6.1%). Respiratory tract infections (61.6%) and bacteremia (21.9%) were the most common infections. The secA1 gene resolved the inconclusive identification, and two major clonal lineages were observed for G. sputi and G. bronchialis. Species showed a wide antimicrobial susceptibility profile. Cefoxitin resistance varies depending on the species, reaching 94.2% for G. sputi and 36.0% for G. terrae. What is noteworthy is the minocycline resistance in G. sputi (11.5%), the clarithromycin resistance in G. bronchialis secA1 lineage II (30.0%) and the amoxicillin-clavulanate and cefepime resistance in G. terrae (21.4% and 42.8%, respectively). G. sputi and G. bronchialis stand out as the prevalent species causing infections in Spain. Resistance against cefoxitin and other antimicrobials should be considered.

Gordonia crocea sp. nov. Isolated from Wound Infection After Pacemaker Implantation: Case Report and Literature Review

Gordonia is a recognized pathogen in patients with immunodeficiency and a normal immune response, which can cause bacteremia, endocarditis, peritonitis and pulmonary infection. We report a case of wound infection after pacemaker implantation caused by Gordonia crocea. Matrix-assisted laser desorption time-of-flight mass spectrometry (MALDI-TOF MS) was routinely used to identify the pathogen, and the results showed that the pathogen could not be accurately identified in the MALDI-TOF database at present. The 16S rRNA gene of the pathogen was further sequenced, and the result was Gordonia crocea. To the best of our knowledge, this is the first reported case of human infection caused by Gordonia crocea.