Infectious disease and Rheumatic fever

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

Rheumatic fever and infectious disease are semantically related. In some cases you can replace phrase "Rheumatic fever" with "Infectious disease", this phrases are similar.

Rheumatic fever noun - A severe disease chiefly of children and characterized by painful inflammation of the joints and frequently damage to the heart valves.

Infectious disease and rheumatic fever are semantically related. You can use "Infectious disease" instead a noun phrase "Rheumatic fever".