I highly suspect these whales consumed inordinate amounts of Wolbachia by co-ingestion / secondary predation or were infected via mouth abrasions or by Culex spp.

Until Culex are acknowledged as Zika vectors and birds (esp. red-whiskered and red-vented bulbuls) are investigated as reservoir / amplifying hosts of Zika, nothing will change in Florida, Houston, or southeast Asia. These regions (and soon, southern California) will be hotbeds of infection for years to come.