Scenario 1. The client has been exposed to an infectious virus during a foreign trip and then contracted it upon returning home.
Scenario #2: A client attends an event with many attendees and contracts the illness from a person who is already infected.
Scenario 3. The client is living in close proximity with someone who has tested positive for the illness. Due to their high contact levels, they have also contracted it.
Scenario #4: A client has a pet which was exposed to the virus. It then passed on this disease through contact with their owner.