You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

It can be difficult to tell the difference between dengue fever and chikungunya .
Output:
It can be difficult to distinguish dengue fever and chikungunya , a similar viral infection that shares many symptoms and occurs in similar parts of the world to dengue .