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Please enter at least one feature (symptom, sign or investigation result) before performing the calculation.
For example, if chest pain and low oxygen saturations were present, but haemoptysis was absent, the features section should look as follows:
To add a feature that is present, start typing and then click the green arrow.
To add the absence of a feature (i.e. a 'negative' finding), start typing then click the red cross.
If you want to remove a feature from the list simply click the grey cross in the box to the right of the feature.
Scarlet fever is a reaction to erythrogenic toxins produced by Group A haemolytic streptococci (usually Streptococcus pyogenes). It is more common in children aged 2 - 6 years with the peak incidence being at 4 years.
Incidence: 25.00 cases per 100,000 person-years
Peak incidence: 1-5 years
Sex ratio: 1:1
Scarlet fever is spread via the respiratory route by inhaling or ingesting respiratory droplets or by direct contact with nose and throat discharges, (especially during sneezing and coughing).
Scarlet fever has an incubation period of 2-4 days and typically presents with:
rash - fine punctate erythema ('pinhead') which generally appears first on the torso and spares the palms and soles. Children often have a flushed appearance with circumoral pallor. The rash is often more obvious in the flexures. It is often described as having a rough 'sandpaper' texture. Desquamination occurs later in the course of the illness, particularly around the fingers and toes