In there report they note that retesting of the herd, subsequent to the initial testing presumably, has yielded no positive this time around.
So it looks like the MERS-CoV infection is an acute infection (it is contracted, it causes illness - perhaps - and then it goes thanks to an immune response - perhaps), as are many/most) viral infections of animals and humans.
An interesting comment within the report states that...
The planned massive survey for MERS-CoV in animals is under implementation and the same herd is under systematic retesting. Follow-up reports will be submitted when there will be new data.
I do like a statement that includes the words "massive study" in it!
Hat tip to CIDRAP.