title: Unanswered questions about the Middle East respiratory syndrome coronavirus (MERS-CoV).
abstract: BACKGROUND
  The Middle East respiratory syndrome coronavirus (MERS-CoV) represents a current threat to the Arabian Peninsula, and potential pandemic disease. As of June 3, 2014, MERS CoV has reportedly infected 688 people and killed 282. We briefly summarize the state of the outbreak, and highlight unanswered questions and various explanations for the observed epidemiology.
  
  
  RESULTS
  The continuing but infrequent cases of MERS-CoV reported over the past two years have been puzzling and difficult to explain. The epidemiology of MERS-CoV, with many sporadic cases and a few hospital outbreaks, yet no sustained epidemic, suggests a low reproductive number. Furthermore, a clear source of infection to humans remains unknown. Also puzzling is the fact that MERS-CoV has been present in Saudi Arabia over several mass gatherings, including the 2012 and 2013 Hajj and Umrah pilgrimages, which predispose to epidemics, without an epidemic arising.
  
  
  CONCLUSIONS
  The observed epidemiology of MERS-CoV is quite distinct and does not clearly fit either a sporadic or epidemic pattern. Possible explanations of the unusual features of the epidemiology of MERS-CoV include sporadic ongoing infections from a non-human source; human to human transmission with a large proportion of undetected cases; or a combination of both. The virus has been identified in camels; however the mode of transmission of the virus to humans remains unknown, and many cases have no history of animal contact. In order to gain a better understanding of the epidemiology of MERS CoV, further investigation is warranted.
authors.affiliation: CE 112 School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia. l.gardner@unsw.edu.au.
authors.forename: Lauren M
authors.initials: LM
authors.lastname: Gardner
authors.forename: C Raina
authors.initials: CR
authors.lastname: MacIntyre
mesh_terms: D018352:Coronavirus Infections / Q000453:epidemiology* / Q000821:virology; D006801:Humans; D065207:Middle East Respiratory Syndrome Coronavirus / Q000302:isolation & purification / Q000472:pathogenicity*