Which of the Following Is False

Which of the following is false?

A) Coccidiomycosis infections usually occur in the lower respiratory tract
B) The lower respiratory tract is a relatively sterile anatomical location compared with the upper respiratory tract
C) Diphtheria and whooping cough are still prevalent in underdeveloped nations despite the availability of effective vaccines
D) Chlamydophila psittaci is transmitted from one human to another