Authors’ contributions: RK: Planned and conducted experiments, conceptualised the laboratory work, wrote the manuscript draft. UE: Planned and conducted experiments, conceptualised the laboratory work, data analysis, co-writing manuscript. AD: data analysis, co-writing manuscript. BT, AB, KB, VF: participated in lab testing. BL: coordinated the public health response. NA: conceptualised the laboratory work, manuscript writing. AS: overall conceptualised the laboratory work, manuscript writing, coordinated the public health microbiology response.