Different subjects? Yes and no.  Historically, CF troops and DND civilian personnel were prescribed anti-malarial drugs and directed to use them prior to deployment to Africa, during deployment, and for a few weeks after redeployment.  Obviously, this was because of the prevalence of malaria carrying mosquitoes in equatorial Africa.  Simply put, if troops aren't delpoyed to Africa then their risk of encountering malaria carrying misquitoes is reduced. Get it? Now, would you like a list of all the other reasons not to deploy to Africa? I have been there and done that but never again.