Received: 25 July 2019
Accepted: 25 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of the Clinical Microbiology Research Center, Shiraz University of Medical Sciences (no. 2016/950306, dated 26/05/2016). The committee waived the need for written informed consent from the study participants for collection of leftover sera.
: Not Applicable.
: The authors declare that they have no competing interests.