The diagram shows a model of disease transmission.
An epidemiologist suspected that bats were acting as a reservoir for an infectious disease in humans.
Which condition would need to be met to confirm the epidemiologist's suspicion?
- The infectious agent would need to have a mode of entry into humans.
- The infectious agent would need a mode of transmission from bats to humans.
- The bats would have to be able to transmit the infectious agent between each other.
- The susceptible human host must be able to transmit the infectious agent to the reservoir of bats.