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Introduction: Colorectal cancer (CRC) is the third most common type of cancer in Switzerland in terms of annual new cases and cancer deaths. Since most cantons have an organized screening program, more people are recorded with a positive family history of CRC. In the majority, the familial form of CRC is present, a hereditary form is much less common. Relatives of patients with CRC are a heterogeneous group whose CRC risk varies. A good assessment of disease risk can optimize the benefit-risk ratio for more intensive prevention. These recommendations («expert opinion statement») are intended to serve as a basis in clinical practice for planning preventative care, monitoring and human genetic counseling in the presence of a family history positive for CRC., Competing Interests: Die Autorschaft keine Interessenkonflikte im Zusammenhang mit diesem Artikel deklariert., (© 2024 Aerzteverlag medinfo AG.)

A 30-year-old male patient was admitted to our outpatient clinic because of fever, headache and cerebellar symptoms. Clinically he presented with a slight meningism. After exclusion of a focal intracerebral process by head scanning, a first diagnosis of an aseptic meningitis was made by the analysis of the cerebrospinal fluid. With the hint of repeated tick bites, the diagnosis of an early-summer meningoencephalitis was confirmed. The patient recovered without neurological residua within two months. The clinical course, dates of new epidemiologic studies and problems of vaccination are discussed.