Yes the rash can last up to 6 days or so.
No. Scarlet fever (called Scarlatina in days gone by) is defined as a particular rash in the setting of a proven streptococcal infection. Usually, this is strep pharyngitis (sore throat), but it can be any strep infection (skin, etc). The rash is pretty classic, involving the face with sparing of the area around the mouth and lips (peri-oral pallor - because the area looks pale compared to the rest of the face), and involving the creased areas more than others (armpits, groin folds, etc). The rash also feels very rough to the touch - leading it to be called a "sandpaper rash." I saw a patient with this last week :)
The only disease that is altogether gone is smallpox. But there are a number of diseases that were around in those days that are rarely found today, including polio, scarlet fever, cholera, typhoid fever, typhus, diphtheria, and others. Most of these were made rare by better sanitation, which was introduced starting in the 1890s, antibiotics, introduced in the 1940s, or vaccinations, which began among Europeans about 1800 or a little earlier.
Both "Gone are the days" and "Gone were the days" are correct, but they convey slightly different meanings. "Gone are the days" suggests that those days have recently ended or are no longer present, while "Gone were the days" implies a sense of nostalgia or longing for those past days.
No, the sentence "By that time he will have been gone for three days" is in future perfect continuous tense.
no, she was for it
It is Scarlet.
Gone with the Wind
In what?
With Scarlet O'Hara's family at home
Bonnie was Scarlet and Rhet's daughter.
Scarlet
Gone is the past participle of go. Going is the present participle of go.