welcome to HCM!
is a symptom and not a disease by itself. Fever is brought down using antipyretic
drugs like paracetamol
which is a safe and effective treatment for fever.
The most important approach in the treatment of fever is to identify the underlying cause and treat it.Since in your grandson's blood test
some virus has been identified so I think there is nothing to worry.In some viral infections, the fever may be self-limiting(that is, the fever will disappear once the infection is cleared).
Hope this helps!Take care!