This is the 12478th most frequent Russian word.
клещевого
"Клещевого" means "pertaining to a tick."
The word 'клещевого' is used here as part of the phrase 'клещевого энцефалита', which refers to encephalitis caused by ticks, indicating the origin or relationship.
Вакцинация против клещевого энцефалита обязательна для путешественников в этот регион.
Vaccination against tick-borne encephalitis is mandatory for travelers to this region.
Here, 'клещевого' modifies the noun 'укуса', denoting 'tick bite' season, specifying the association with ticks.
Сезон клещевого укуса начинается в апреле, и следует быть осторожным.
The tick bite season starts in April, and one should be cautious.
In this sentence, 'клещевого' relates to 'переноса', describing the transmission of infections as associated with ticks, indicating the method or agent of transmission.