Dengue fever and Infectious disease

Dengue fever noun - An infectious disease of the tropics transmitted by mosquitoes and characterized by rash and aching head and joints.

Infectious disease and dengue fever are semantically related. In some cases you can use "Infectious disease" instead a noun phrase "Dengue fever".

Infectious disease noun - A disease transmitted only by a specific kind of contact.

Dengue fever and infectious disease are semantically related. Sometimes you can replace phrase "Dengue fever" with "Infectious disease", this phrases are similar.