Ignatzschineria indica bacteremia in a patient with a maggot-infested heel ulcer: a case report and literature review

Microbiome analysis of thai traditional fermented soybeans reveals short-chain fatty acid-associated bacterial taxa

Thua Nao is a Thai traditional fermented soybean food and low-cost protein supplement. This study aimed to evaluate the bacterial community in Thua Nao from northern Thailand and assess potentially active short-chain fatty acids (SCFAs)-related bacteria. Sixty-five Thua Nao consisting of 30 wet and 35 dried samples were collected from six provinces: Chiang Rai, Chiang Mai, Mae Hong Son, Lampang, Lamphun, and Phayao. Bacterial diversity was significantly higher in the wet samples than in the dried samples. The dominant phyla were Firmicutes (92.7%), Proteobacteria (6.7%), Actinobacteriota (0.42%), and Bacteroidota (0.26%). The genus Bacillus (67%) was the most represented in all samples. Lactobacillus, Enterococcus, and Globicatella were enriched in the wet samples. Assessment of the SCFA-microbiota relationships revealed that high butyrate and propionate concentrations were associated with an increased Clostridiales abundance, and high acetate concentrations were associated with an increased Weissella abundance. Wet products contained more SCFAs, including acetate (P = 2.8e-08), propionate (P = 0.0044), butyrate (P = 0.0021), and isovalerate (P = 0.017), than the dried products. These results provide insight into SCFA-microbiota associations in Thua Nao, which may enable the development of starter cultures for SCFA-enriched Thua Nao production.

Phylogenomics and comparative genomic analyses support the creation of the novel family Ignatzschineriaceae fam. nov. comprising the genera Ignatzschineria and Wohlfahrtiimonas within the order Cardiobacteriales

The genera Ignatzschineria and Wohlfahrtiimonas were originally classified as members of the family Xanthomonadaceae, order Xanthomonadales of the class Gammaproteobacteria. With the recent taxonomic revisions in the order Xanthomonadales, the two genera were left unclassified in both family and order level. As members of these genera were considered emerging pathogens, their proper classification is therefore relevant. Here, a phylogenomics and comparative genomic approach was used to ascertain the taxonomic position of the two genera. Result showed that the members of the two genera formed a highly supported monophyletic clade with the members of the order Cardiobacteriales. This close affiliation was further supported by the results of the comparative analysis of the 16S rRNA sequence similarity values. The comparative analyses of the 16S rRNA sequence similarity and average amino acid identity values also implied that the two genera represent a single novel family. Conserved signature indels (CSIs) in seven protein sequences were exclusively shared by the members of the novel family. In addition, four CSIs were also found to be useful in delimiting members of the two genera at the genus level. To accommodate the two genera in a single family within the order Cardiobacteriales, the name Ignatzschineriaceae fam. nov. is proposed.

A case of sepsis due to a rare carbapenem-resistant Ignatzschineria species

Ignatzschineria species have emerged only recently and few cases have been identified worldwide. It has been determined that maggots likely serve as the vector of transmission and the majority of cases described involved cutaneous myiasis. This article presents the first case of an Ignatzschineria species closely related to I. larvae/I. ureclastica causing bacteremia in North America. This isolated Ignatzschineria species is also unique in its broad antimicrobial resistance pattern to carbapenem antimicrobials, an uncommon finding among global Ignatzschineria isolates. Improving the ability to identify Ignatzschineria species is an important step to develop the necessary CLSI breakpoints and treatment guidelines. The paucity of information regarding Ignatzschineria species and the inability to accurately identify these organisms indicate the need for more research and improved identification techniques of this emerging pathogen.

Ignatzschineria larvae Bacteremia Following Lucilia sp. Myiasis in an Irregular Migrant: A Case Report

Bacteremia induced by wound myiasis is uncommon and therefore rarely suspected by clinicians when treating patients with neglected wounds. We present a case of Ignatzschineria larvae bacteremia as a complication of Lucilia sp. maggot wound myiasis in a young male migrant. This is the first reported human case of Ignatzschineria bacteremia in Slovenia and one of the 2 described in the literature where the fly larvae infesting the wounds of the patient with Ignatzschineria bacteremia were not only suspected to be Lucilia sp. but also entomologically identified.

Ignatzschineria indica bloodstream infection associated with maggot infestation of a wound in a patient from Canada

We describe a case of Ignatzschineria indica bacteremia in a patient with maggot infestation of a necrotic left leg wound. Ignatzschineria spp are an infrequent cause of infection in patients with wound myiasis. We review 16 cases described in published literature. Microbiologists and clinicians should be aware of uncommon bacteria, including Ignatzschineria spp, that may cause infection in patients with maggot-infested wounds such that these organisms are appropriately worked up and treated when found in clinical specimens.