An outbreak of milky epidemic of encephalitis caused by tick-borne encephalitis virus in Kielce Province.
An outbreak of tickborne encephalitis (TBE) was reported between May 14 and June 20 1995 in Busko Zdrój in Kielce Province, Poland. Drinking fresh (unboiled) goat's milk from a private farm was the probable cause of the outbreak. 63 people drank goat's milk from the same source; 15 were hospitalized with neurological symptoms, 33 had influenza-like symptoms and were treated in the out-patient department (27) or healed spontaneously (6), and 15 people were healthy. TBE virus antibodies were found in cerebrospinal fluid of all 15 persons with neurological symptoms. IgM and IgG against TBE virus were present in sera of the 15 hospitalized patients and 20 patients with influenza-like symptoms. Antibodies to TBE virus were detected in serum of 1 of 19 goats from the breeding farm confirming the source of TBE virus infection.