What exactly is scarlet fever? can you tell me what exactly is a scarlet fever and where it comes from?

Strep A + gene: Group a streptococcus is cause of throat infections. It is acquired from contaminated fingers or contact with oral secretions of a source case. Some strains have additional genes that code for making a toxin that spreads through the blood & gives a red, sandpaper & sunburn like rash starting within 12 hrs of the fever. This is commonly called scarlet fever.