varieties of disease ?

Question

Varieties  (does this mean many types ? )of disease X requiring expensive special treatment have become less common during the past decade. Can disease X have many types ?  Let's us the disease X is AIDS. Can AIDS have different types ?Question, Why the word is in plural when itself already is ?According to the dicitionary, #1 A different type of something:The article was about the different varieties of Spanish spoken in South America#2 many different types of things or people:She does a variety of fitness activities.Thanks

CalifJim · Accepted Answer

[Varieties / Types] of disease X ... Not many types; just types. It's in the plural because it is not already a plural.

Diseases can occur as different [kinds / types / varieties] of the same disease, yes. I don't if AIDS is one of these, but I know from my reading that there are different [kinds / types / varieties] of leukemia, for example, and different [kinds / types / varieties] of cancer as well. One [kind / type / variety] of a disease can be very different from another [kind / type /variety] of the same disease.

One variety of appendicitis is called chronic appendicitis.
Another variety of appendicitis is called acute appendicitis.
There are at least two varieties of appendicitis.
One variety of lettuce is called oak-leaf lettuce.
Another variety of lettuce is called black-seeded Simpson lettuce.
There are more than fifteen varieties of lettuce.

Another meaning of variety is seen in the phrase a variety of + plural. Here it means several different or various.

We tried [a variety of / several different / various] methods to revive the drowning man.
Julie did the same experiment in [a variety of / several different / various] settings.
For [a variety of / several different/ various] reasons, the Bronsons cancelled their trip to London.

CJ

varieties of disease ?

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