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Most people are no longer contagious 24 hours after starting an appropriate antibiotic which eliminate streptococcus. Scarlet fever is a Streptococcus infection causing a high fever and a characteristic rash in children. Scarlet fever is most common in children between the ages of 5 and 15. Scarlet fever spreads by droplet and by contact transmission. Fomites and airborne transmission are rarely involved. Close contact is necessary to get the infected secretions from one person to the next. Children are most contagious during the fever. Most people are no longer contagious 24 hours after starting the antibiotic. I also recommend getting a new toothbrush for children after they are no longer contagious but before they finish the antibiotics, to prevent re-infection. source : wikipedia

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