Ringel rubella are caused by a virus. In addition to scarlet fever, measles, chickenpox and rubella, they are one of thefive childhood diseases that cause a rash. Ringel rubella only share their name with rubella. The two diseases are caused by different pathogens. The Ringel rubella virus (Parvovirus B 19) occurs only in humans. Often, Ringel rubella progress without being noticed or like a slight cold. If a pregnant woman falls ill, however, the unborn child can suffer damage. In nurseries and schools, cases occur most often in late winter to early summer. Only persons who have never had Ringel rubella before can catch them. After having the disease once, you will be protected throughout your life. You cannot catch it again.
When sneezing, coughing or speaking, tiny spittle droplets are passed on from person to person in the air. The viruses can also be passed on via the hands, e.g. when a patient sneezes into his hands and then shakes hands with a healthy person. From the hand, the pathogens can then be spread on the mucous membranes of nose or mouth and cause contagion.
Pregnant women may pass on the pathogens to their unborn child, depending on whether the mother develops symptoms or the disease progresses without bring noticed. The unborn child is highly endangered by this.
The pathogens are highly resistant in the environment as well. Affected objects such as door handles or toys can spread the viruses and cause contagion.
In rare cases, transfer is possible by blood conserves contaminated with viruses.
Usually, the disease progresses without symptoms, with minor symptoms or with symptoms similar to a flu-like illness, with a fever, swelling of the lymph nodes, headaches and feeling unwell. The disease is easily recognisable by the typical skin rash. The first sign is a large, butterfly-shaped reddening that forms 1 to 2 weeks after infection on both cheeks. One or two days later, blotches of red skin are also seen on the shoulders, upper arms, thighs and buttocks: these can also change their shape and later come to resemble garlands or large rings. The rash starts to fade after 7 to 10 days but can, in the event of stress, exposure to sun or other causes, become pronounced again over the next few days. Rarely, the skin may be itchy and it may occasionally feel “stretched”.
Complications are rare. The disease usually resolves fully on its own without further complications. Occasionally, there may be temporary joint problems or joint inflammation, particularly in women or girls. In persons with a compromised immune system or certain hereditary blood conditions such as thalassaemia or sickle cell anaemia, the disease may occasionally result in a dangerous case of anaemia.
The period between infection and the typical skin rash is approximately 1 to 2 weeks. The danger of infection for others is highest in the days before the skin rash appears. This means that the patient is infectious for others but does not yet know that they are carrying the virus. Once the rash appears, the patient becomes much less contagious. Even if the disease occurs without any symptoms at all, the patient will also be contagious for a few days.
Pre-school children are most at risk for becoming infected with the pathogen. Older children, adolescents and adults may also catch the disease. Among adults, the otherwise usually mild disease will often have a more severe progress.
Pregnant women who have not had the disease in childhood are especially at risk, since they have no defence against the pathogen. The virus may be transferred to the unborn child as late as the 20th week of pregnancy. Blood production of the unborn child may be damaged in a life-threatening manner. Miscarriage or stillbirth may be the consequence of this.
Persons with immune deficiencies or who have an acquired or hereditary disease of the blood system are also at greater risk.
It is very difficult to protect yourself from fifth disease, since the danger of infection is highest before the first symptoms occur. There is no vaccine against fifth disease. Since the pathogen is transmitted via saliva or aerosols and the hands, only basic hygiene precautions can work to reduce the risk of infection.
Avoid contact with persons who may have become infected with the pathogen.
Your local health authority can provide you with further advice and information, and has considerable experience with handling this disease.
More information on the illness itself is also available online from the Robert Koch Institute (www.kinderaerzte-im-netz.de).
For information on how hygiene can guard against infection, please visit the Federal Centre for Health Education website (www.infektionsschutz.de).