WHO has published Middle East respiratory syndrome coronavirus (MERS-CoV) – update. Excerpt:
On 2 May 2014, the National IHR Focal Point for the United States notified WHO about the first laboratory confirmed case of MERS-CoV infection in the United States.
As part of the investigation of contacts of the first confirmed case, testing for MERS-CoV was undertaken on contacts. A contact of the first case initially tested negative for MERS-CoV by PCR based on respiratory tract samples taken 10 days after contact with the first case. However, on 16 May, this contact tested positive for antibodies for MERS-CoV in a blood sample taken 14 days after contact. Currently, this individual is asymptomatic. He is a male in his 70s with comorbidities and has no history of travel to countries outside the United States.
The antibody test result suggests this individual may have been infected with MERS-CoV; however he does not meet WHO's current definition of a laboratory confirmed case of MERS-CoV, which requires positive PCR tests.
Globally, 632 laboratory-confirmed cases of infection with MERS-CoV have officially been reported to WHO, including 193 deaths. The global total includes all of the case reported in this update, plus 17 laboratory confirmed cases officially reported to WHO from Saudi Arabia between 16 and 18 May. WHO is working with Saudi Arabia for additional information on these cases and will provide further updates as soon as possible.
Saudi MERS reports to WHO seem to be erratic. On May 7 WHO said it had received information on 229 cases from the KSA between April 11 and May 4 -- this after a May 1 report of 138 cases between April 11 and 26. It's impossible from this sketchy outline to tell which cases in the KSA MOH statements are also in their reports to WHO.