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Among adults infected with the European subtype, two-thirds will only experience phase one.3 After about 8 days of no symptoms, 20-30% of patients will experience a second phase.3 Of those that experience both phases, about 30-60% will develop long-term sequelae.3
TBE symptoms can be initially mistaken for a mild flu-like illness.4
Symptoms of TBE typically appear in two distinct phases, with specific symptoms for each phase.5
TBE can be transmitted to humans within minutes of a single bite from an infected tick.7,8
Environmental changes and human behavior are helping ticks cross geographic boundaries into new areas.9
*Data is from non-US travelers.