The paper on which the Geographic article is based puts it a little differently:

Our studies suggest that honey bee populations in East Africa appear to
be largely resistant or tolerant of the parasites and pathogens that
threatened honey bee populations in other parts of the world, and
are not yet significantly impacted by other stressors, such as
exposure to environmental toxins. However, since there may be a
time lag before these newly introduced pathogens and parasites
significantly impact honey bee populations, additional long-term
monitoring is necessary.

Citation: Muli E, Patch H, Frazier M, Frazier J, Torto B, et al. (2014) 
Evaluation of the Distribution and Impacts of Parasites, Pathogens, and Pesticides on Honey Bee
(Apis mellifera) Populations in East Africa. PLoS ONE 9(4): e94459

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