keto twenty one - from late winter to early spring, just like smallpox.Infectious erythema - symptomsIn the first phase of the disease, i.e. from a few to several days, flu-like symptoms occur, i.e.Then there is a rash on the face, which due to its characteristic location is referred to as " slapped child syndrome ". In the following days it can spread to the torso, thighs and buttocks and last for about 2-3 weeks. The rash disappears without leaving any scars.Diagnosis is based on genetic testing of the parvovirus B19 DNA genome (by PCR) or testing for the presence of parvovirus B19-specific IgM antibodies (by ELISA). It should be remembered