Which of the following is most commonly spread through direct contact with other animals?

• A. Lice
• B. Ticks
• C. Mites
• D. Fleas

Answer: (A)

Lice spread mainly through direct contact because they spend their entire life on the host animal. They don’t jump or fly, and they don’t survive well off the animal, so transmission happens most often when animals touch, groom, or rub against each other in close quarters. In crowded settings like barns or shows, this close contact makes lice infestations spread rapidly from one animal to another.

Ticks, fleas, and mites can also move between animals, but their spread relies more on environmental exposure, bites, or the animals sharing bedding or habitats. Lice’s exact dependence on direct, close contact for transmission makes them the most common form of spread by direct contact among these options.