An outbreak investigation of < em > Legionella < /em > non- < em > pneumophila < /em > Legionnaires' disease in Sweden, April to August 2018: Gardening and use of commercial bagged soil associated with infections

Euro Surveill. 2021 Feb;26(7):1900702. doi: 10.2807/1560-7917.ES.2021.26.7.1900702.ABSTRACTIn early June 2018, an increase in non-travel-related cases of Legionella non-pneumophila Legionnaires' disease (LD) was observed in Sweden and a national outbreak investigation was started. Outbreak cases were defined as notified confirmed or probable cases of L. non-pneumophila LD, with symptom onset after 1 April 2018. From April to August 2018, 41 cases were reported, 30 of whom were identified as L. longbeachae. We conducted a case-control study with 27 cases and 182 matched controls. Results from the case-control study indicated that gardening and handling commercial bagged soil, especially dusty dry soil, were associated with disease. L. longbeachae was isolated in soils from cases' homes or gardens, but joint analysis of soil and human specimens did not identify any genetic clonality. Substantial polyclonality was noted between and within soil samples, which made finding a genetic match between soil and human specimens unlikely. Therefore, whole genome sequencing may be of limited use to confirm a specific soil as a vehicle of transmission for L. longbeachae. Handling soil for residential gardening was associated with disease and the isolation of L. longbeachae in different soils provided further evidence for Legionella non-pneumophila infection from soil.PMID:33602385 | PMC:PMC7897914 | DOI:10.2807/1560-7917.ES.2021.26.7.1900702

Source: Euro Surveill - February 19, 2021 Category: Infectious Diseases Authors: Emma L öf Fanny Chereau Pontus Jureen Sabina Andersson Kristina Rizzardi Petra Edquist Sharon K ühlmann-Berenzon Ilias Galanis Caroline Sch önning Madeleine Kais Anne Tideholm Nyl én Anders Wallensten Adam Roth National Outbreak Investigation Team Source Type: research