Teemu Kallonen

Effect of COVID ‐19 Pandemic on Epidemiology and Antimicrobial Susceptibility of Campylobacter Species, Salmonella enterica and Yersinia enterocolitica in Southwest Finland 2018–2022

Tanja Orpana, Teemu Kallonen, Antti Hakanen, Marianne Gunell

This study investigated the effect of the COVID-19 pandemic on the epidemiology and antimicrobial susceptibility of fecal Campylobacter spp., Salmonella enterica, and Yersinia enterocolitica strains in Southwest Finland from 2018 to 2022. Results show that the number of travel-associated S. enterica and …

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Corrigendum to “Long-term neutralization capacity of vaccine and breakthrough infection induced SARS-CoV-2 specific antibodies against omicron subvariants BA.2, XBB.1.5, and JN.1” [Vaccine 68 (2025) 127894]

Arttu Reinholm, Hira Khan, T.I. Laakso, Sari Maljanen et autres

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Temporal Associations Between Human Milk Metabolites and the Infant Gut Microbiome and metabolome

Heidi Isokääntä, Laura Perasto, Santosh Lamichhane, Minka Ovaska et autres

Abstract Introduction Human milk is vital in establishing a healthy infant gut microbiome. Gut microbes and their metabolites are important for host development. However, our understanding of how milk metabolites are connected to the gut microbiome and metabolome in early-life remains limited. …

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Long-term neutralization capacity of vaccine and breakthrough infection induced SARS-CoV-2 specific antibodies against omicron subvariants BA.2, XBB.1.5, and JN.1

Arttu Reinholm, Hira Khan, T.I. Laakso, Sari Maljanen et autres

The long-term effectiveness of COVID-19 vaccines remains a critical area of study, especially with the emergence of new SARS-CoV-2 subvariants. In this study, we investigated the long-term neutralization capacity of SARS-CoV-2 -specific antibodies induced by the third, fourth and fifth vaccine doses, …

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Faecal transplantation from exuberant toddlers increases exploratory behaviour in rats

Anna‐Katariina Aatsinki, James M. Collins, Eveliina Munukka, Saara Nolvi et autres

Abstract Background Behavioural phenotypes have previously been transferred via faecal microbiota transplantation (FMT) from patients with psychiatric disorders to rodents. Studies indicate that the gut microbiota composition may be linked to certain temperament traits, defined as biologically-based differences in emotional reactivity and …

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Bioinformatiikka bakteriologiassa - lupauksia ja haasteita

Teemu Kallonen, Antti Hakanen

Bakteriologiassa bioinformatiikalla pyritään vastamaan usein hyvin tavanomaisiin kysymyksiin, kuten mikä bakteerilaji on kyseessä, onko tutkittu kanta sukua tunnetuille taudinaiheuttajaklooneille tai onko kannalla resistenssi- ja virulenssitekijöitä. Lisäksi se mahdollistaa vastaamisen monimutkaisempiin kysymyksiin, kuten mikä bakteerin geneettinen muutos on assosioitunut potilaan tautitilaan. Bioinformatiikkaa tarvitaan …

Nalidixic acid—a good marker of fluoroquinolone resistance mechanisms in Escherichia coli

Sofia Kalinen, Heini Kallio, Teemu Kallonen, Juha Knaapila et autres

ABSTRACT The purpose of this study was to evaluate how ciprofloxacin, pefloxacin, and nalidixic acid disks perform in screening fluoroquinolone resistance mechanisms in 278 Escherichia coli isolates collected from a prospective clinical material. Antimicrobial susceptibility testing of ciprofloxacin, pefloxacin, and nalidixic acid …

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Longitudinal dynamics of gut plasmidome and antibiotic resistance during antibiotic therapy: a case report

Ilmur Jonsdottir, Sean Meaden, Paulina T. P. Salminen, Teemu Kallonen et autres

Abstract The human gut microbiome is composed of diverse microbes, and its association with human health is well-recognized. Antibiotic therapies for treating infectious diseases often mediate adverse influences on gut microbial ecosystems. Further, ESBL (extended-spectrum beta-lactamase)-producing bacteria potentially residing in the gut …

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Correction to “Comparative Metabolomics and Microbiome Analysis of Ethanol versus OMNImet/gene•GUT Fecal Stabilization”

Heidi Isokääntä, Lucas Pinto da Silva, Naama Karu, Teemu Kallonen et autres

Correction to: Comparative metabolomics and microbiome analysis of ethanol versus OMNImet/gene.GUT fecal stabilization (vol 96, pg 8893, 2024) 10.1021/acs.analchem.3c04436

Pan-pathogen deep sequencing of nosocomial bacterial pathogens in Italy in spring 2020: a prospective cohort study

Harry A. Thorpe, Maiju E. Pesonen, Marta Corbella, Henri Pesonen et autres

BACKGROUND: Nosocomial infections pose a considerable risk to patients who are susceptible, and this is particularly acute in intensive care units when hospital-associated bacteria are endemic. During the first wave of the COVID-19 pandemic, the surge of patients presented a significant obstacle …

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Deep sequencing of Escherichia coli exposes colonisation diversity and impact of antibiotics in Punjab, Pakistan

Tamim Khawaja, Tommi Mäklin, Teemu Kallonen, Rebecca Ashley Gladstone et autres

Multi-drug resistant (MDR) E. coli constitute a major public health burden globally, reaching the highest prevalence in the global south yet frequently flowing with travellers to other regions. However, our comprehension of the entire genetic diversity of E. coli colonising local populations …

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Comparative Metabolomics and Microbiome Analysis of Ethanol versus OMNImet/gene•GUT Fecal Stabilization

Heidi Isokääntä, Lucas Pinto da Silva, Naama Karu, Teemu Kallonen et autres

Metabolites from feces provide important insights into the functionality of the gut microbiome. As immediate freezing is not always feasible in gut microbiome studies, there is a need for sampling protocols that provide the stability of the fecal metabolome and microbiome at …

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