The statement "The insect vectors have six legs and include ticks, mosquitoes, and lice" is True.
Vectors are living organisms which can transfer infectious pathogens among humans and also from animals to humans.
Insect vectors include the bloodsucking insects, which take-in the disease-causing microorganisms (pathogens) during a blood meal from an infected host (human or animal) and transfer it to a new host afterwards.
Oftentimes, when a vector turns infectious, it is competent enough to transmit the pathogen for the rest of its life during every successive bite or blood meal.
Mosquitoes are vectors of Malaria, tick-borne encephalitis is transmitted by ticks whereas Typhus is transmitted by lice.
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