Found this:
Quickly looked up Port Reitz on wiki:
Port Reitz (pronounced /ˌpɔərˈtriːs/, alternatively spelled Portreitz) is a district of Mombasa, Kenya, and is located north-west of the island.
looks like Coast Province General Hospital was around in 1960
http://www.journals.elsevierhealth.com/periodicals/trstmh/article/PII0035920363900099/abstract
Dr. Ang'awa if this is real is an interesting doctor to pick on as in 1962 by the above post office address of a document he submitted and if found in the Oxford Press, reveals his Post Office Box in Nairobi, Kenya and he is the big syringe handler in charge of the new program to wipe out tuberculosis in Africa with vaccinations.
What you found addresses the geography, though, so better.
Does Corsi do any research or does he rely on others and then does not check their work? Anybody know? Seems very sloppy.