The outbreak has now sickened 90 people in 13 states, with 27 people hospitalized.
The number of people sickened in the multistate E coli O157:H7 outbreak has risen from 49 to 75, with 22 hospitalized.
Federal investigators are looking at ground beef and slivered onions as potential sources of the outbreak.
The first phase of Nigeria's campaign will begin in November, targeting Kebbi and Beyelsa states, where malaria activity is especially high.
More education is needed on the safe preparation of wild game to prevent the rare parasitic illness, the authors say.
Of the 65 people sickened, 24 have required hospitalization.
Climate change will have increasing effects on public health and food security over time, the authors say.
The analysis also found high levels of community deaths in some countries, which highlights serious gaps in treatment.
Illness-onset dates range from March 11 to July 26, with patient ages ranging from less than 1 year to 94.
Tests on turtles or their environments in California and Illinois were positive for one of the two outbreak strains.
