Final answer:
Norwalk virus, a norovirus, is transmitted through direct contact, contaminated food, or surfaces; it doesn't use vectors like mosquitoes or ticks.
Step-by-step explanation:
The Norwalk virus, which is more commonly known today as a strain of norovirus, is typically associated with a transmission method that does not involve vectors such as mosquitoes or ticks that are often connected with diseases like West Nile virus or Lyme disease. Instead, the Norwalk virus is known for being highly contagious and is transmitted primarily through direct contact with an infected person, consumption of contaminated food, or contact with contaminated surfaces. Good hygiene and proper food handling are critical in preventing the spread of the disease.