Which of the following is a common vector for Typhus?

Lice are a common vector for Typhus because Typhus fever is primarily transmitted to humans by the body louse, specifically Pediculus humanus corporis. These lice harbor the bacteria Rickettsia prowazekii, which causes epidemic typhus. The transmission occurs when lice feed on the blood of an infected person and then defecate near the bite wounds; the bacteria can enter the bloodstream if the host scratches the bite and introduces the pathogen through broken skin.

In contrast, other vectors such as ticks, mosquitoes, and flies are associated with different diseases. Ticks are known for transmitting Lyme disease and Rocky Mountain spotted fever, while mosquitoes are vectors for diseases like malaria and dengue. Flies, particularly certain species, can transmit diseases through contamination but are not relevant for Typhus. Therefore, lice's unique role in the transmission of Typhus underscores their significance as vectors for this specific infection.