Vector-borne illnesses have doubled over the past two decades, as the number of pathogens grows and affected areas expand.
At least 5 people have contracted the tick-borne disease after travel to Mexico, and 3 died.
Claims for the tick-borne illness were more common in rural than urban areas in June and July, but the opposite was true from November to April.
The latest Gates Foundation funds support mRNA vaccine production in Africa and other lower-income regions.
Powassan virus infections are still rare, but are increasing.
The WHO guidance replaces temporary recommendations, Florida has 15 dengue cases now, and Connecticut confirms 4 people infected with the tick-borne Powassan virus.
Virologists report what appears to be a second-generation BA.2 lineage Omicron virus with many spike protein mutations.
The condition is mainly linked to bites from the lone star tick, which are most common in the South and Midwest.
The vaccine candidate was safe and produced a strong but waning immune response against the six most common strains of the Borrelia burgdorferi.
The USDA has conditionally licensed an oral vaccine designed to limit the spread of Borrelia burgdorferi, the bacterium that causes Lyme disease.