Reports involve a 2nd Dutch case, 3 Saudi ones, and 7 retrospectively confirmed cases in Jordan.
A WHO panel said the threat still does not qualify as a global public health emergency.
In addition to the Dutch MERS case, Saudi Arabia reports 16 new infections.
The 2 workers are being monitored, as Saudi Arabia reports 4 new MERS cases.
The 2nd US patient is a health worker from Saudi Arabia, which saw 18 new cases.
Also, the Saudi agriculture ministry for the first time offered MERS-CoV camel precautions.
Most of the new cases occurred among young adults in Jeddah and Riyadh, half of them asymptomatic.
Lebanon confirms its first case, while Saudi Arabia reports 14 more, with 5 deaths.
A hospital official said the first US MERS patient had some non-respiratory symptoms before he left Saudi Arabia.
As Saudi Arabia reports 28 new MERS cases, experts point up infection control issues in hospitals.
