The roadmap was created under the guidance of 50 scientific leaders.
The case is the fifth reported in Saudi Arabia this year.
The index case-patient, who died from his infection, shared a hospital room with the second patient identified.
The group steered away from defined cutoff points such as "droplets" and "aerosols" that scientists have used to distinguish larger particles from smaller particles.
Two people had connections to camels, but the exposure source is still unknown for two of the patients.
MERS-CoV antibody reactivity was identified in 7 of 48 camel-slaughterhouse workers (15%).
Groups announced new clinical trials and more support for universal flu, MERS, and mpox vaccines.
Prioritized COVID tracking and effects from COVID control measures likely contributed to a drop in MERS cases, but the threat remains, the WHO said.
The source of the virus isn't clear, and genetic analysis is underway to look for clues or changes and to help with risk assessment.
The findings could help in the structure-based design of pan-coronavirus vaccines and therapies, the authors say.
