A-LevelBiologyInfectious diseases9700/12 · Feb/Mar 2023 · Q371 Mark
What defines infectious diseases?
ASymptoms are caused by a bacterium that passes from contaminated air, soil or water to a host.
BSymptoms are caused by a pathogen that is transmitted from one host to another.
CSymptoms are caused by a microorganism that is carried by a vector.
DSymptoms are caused by a virus that mutates to infect a new species.
✓ Correct answer
B: Symptoms are caused by a pathogen that is transmitted from one host to another.
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