What is scarlet fever?
Scarlet fever is due to a throat infection caused by a bacterium (germ) called streptococcus. There are various strains (types) of streptococcus. They cause different infections and a strain called group A streptococcus causes scarlet fever.
The scarlet fever rash occurs when the streptococcal bacteria release toxins (poisons) that make the skin go red. The toxins get into the blood from the infected throat.
Scarlet fever is most common in children aged 3-15 years, the most common age being 4 years. It more frequently occurs in the late winter or in early spring.
What are the symptoms of scarlet fever?
- Sore throat and fever (high temperature) are the typical first symptoms.
- A bright red (scarlet) rash then soon develops. The rash starts as small red spots, usually on the neck and upper chest. It may feel like fine sandpaper when you touch it. It soon spreads to many other parts of the body. The face may become quite flushed. The rash blanches (goes white) if you press on it. The areas of skin around the eyes, lips and nose are usually spared from this rash.
- The tongue may become pale but coated with red spots (strawberry tongue). After a few days the whole tongue may look red.
- Other common symptoms include: headaches, vomiting, being off food and feeling generally unwell.
The sore throat and fever last a few days, and then usually ease. The rash lasts about six days, and then usually fades away. As the rash fades, some of the skin may peel, mainly on the hands and feet (a bit like after being sunburnt). The rash can recur over the following three weeks though.
However, not all people with streptococcal infections develop the rash, as some people are not sensitive to the toxin. A mild form of scarlet fever may occur; this is often called scarletina.
Are there any tests for scarlet fever?
This condition is usually diagnosed by the symptoms, especially if you have the typical rash.
Sometimes your doctor will take a swab from your throat to be tested for streptococcus. A blood test is also sometimes done which can confirm that you have this infection.
What is the treatment for scarlet fever?
Treatment is to speed recovery and to prevent possible complications.
A 10-day course of penicillin is usually advised. Other antibiotics are advised if you are allergic to penicillin. Symptoms usually improve in a few days, but it is important to finish the course of antibiotics. This makes sure all the bacteria are killed and reduces the chance of complications.
Make your child comfortable
A fever can make your child feel uncomfortable and irritable. The following are things that you can do that may bring the temperature down and make your child feel more comfortable:
- You can give paracetamol or ibuprofen. Both of these medicines can lower a temperature. You can buy these medicines in liquid form for children. They come in various brand names. The dose for each age is given with the medicine packet.
Note: these medicines do not treat the cause of the fever. They merely help to ease discomfort. You do not need to use these medicines if your child is comfortable and not distressed by the fever.
Note: do not use ibuprofen for:
- Children known to react (have hypersensitivity) to ibuprofen or other non-steroidal anti-inflammatory drugs (NSAIDs).
- Children in whom attacks of asthma have been triggered by a NSAID.
- Take the clothes off your child if the room is normal room temperature. It is wrong to wrap up a feverish child. The aim is to prevent overheating or shivering.
- Give lots to drink. This helps to prevent dehydration. You might find that a child is more willing to have a good drink if they are not so irritable. So, if they are not keen to drink, it may help to give some paracetamol or ibuprofen first. Then, try them with drinks half an hour or so later when their temperature is likely to have come down.
Do not cold-sponge a child who has a fever. This used to be popular, but it is now not advised. This is because the blood vessels under the skin become narrower (constrict) if the water is too cold. This reduces heat loss and can trap heat in deeper parts of the body. The child may then get worse. Many children also find cold-sponging uncomfortable.
Some people use a fan to cool a child. Again, this may not be a good idea if the fanned air is too cold. However, a gentle flow of air in a room which is room temperature may be helpful. Perhaps just open the window or use a fan on the other side of the room to keep the air circulating.
What are the possible complications of scarlet fever?
Treatment with antibiotics reduces the chance of complications. Complications now very rarely occur. However, if they do occur, they can be serious.
Complications due to the spread of the infection can occur early in the infection and may include following:
- Ear infection (otitis media)
- Throat infection and abscess
- Sinus infection
- Meningitis and brain abscess
Later complications can rarely occur a few weeks after the infection has cleared. These occur as a result of immune reactions in the tissues. These may include:
- Rheumatic fever (which can damage the heart)
- Kidney damage (glomerulonephritis)
There is no evidence that catching scarlet fever when pregnant will put your baby at risk.
What is the outlook for people with scarlet fever?
In the past, scarlet fever used to be a very serious condition. Fortunately, nowadays for most cases, scarlet fever is a mild, self-limiting illness. Most children will recover fully within a week or so, even without treatment. (However, it is best to have treatment – see above.)
Deaths from scarlet fever are now extremely rare.
Is scarlet fever infectious?
Yes. Coughing, sneezing and breathing out the bacteria can pass it on to others. Scarlet fever can even be passed on by sharing towels, baths, clothes or bedlinen with a person who has been infected.
It takes 2-4 days to develop symptoms after being infected. You should keep children with scarlet fever off school, and away from others, for 24 hours after starting antibiotics.
Once a person has had scarlet fever, they are very unlikely to get it again.
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