Received: 27 March 2019
Accepted: 11 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: The work is ethically approved by the Scientific Research Committee of the Research Institute of Ophthalmology RIO, Egypt, prior to the beginning of the study. Nasal swab samples used in the study were obtained after individuals’ consent.
: Not applicable.
: The authors declare that they have no competing interests.