Based on what I've uncovered about where Wolbachia-infected Aedes mosquitoes, eggs, and larvae enter the food chain (and the correlation between massive chick and fish deaths), I believe Wolbachia is playing an inordinate role in the spread of disease and death among vertebrates.

For over seven years, Wolbachia-infected Aedes males releases have been taking place in Columbia, Brazil, Vietnam, Indonesia, Australia, southern China, California, and Florida. And safety tests prior to these releases were only carried out on: spiders, spider eggs, soil samples, plant leaves, plant roots, earthworms, and millipedes (in Australia).

Wolbachia is a bacteria and reproductive parasite. There are many types. But the worrisome fact is that many aquatic species (such as copepods) and birds feed preferentially on the Aedes genus of mosquitoes (including their eggs and larvae). 

With 38 citations: http://www.infobarrel.com/Birds_as_Reservoir_Hosts_of_Zika_What_You_Are_Not_Being_Told