Amir Saeed1, Hadi Abd2, Birgitta Evengård3 and Gunnar Sandström1*
1Karolinska Institute, Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska University Hospital, Huddinge, SE-141 86 Stockholm, Sweden.
2Swedish Institute for Infectious Disease Control, SE-171 82 Solna, Sweden.
3Umeå University, Department of Clinical Microbiology, Division of Infectious diseases, Umeå University Hospital, SE-901 85, Sweden.
