Final answer:
Chickenpox transmission involves mode of transmission, portal of entry, and reservoir.
Explanation:
The chain of transmission in the scenario of Christopher catching chickenpox after spending time with an infected person involves the:
- Mode of transmission: Chickenpox is transmitted through direct contact or inhalation of material from skin lesions.
- Portal of entry: Christopher caught the virus after direct contact with an infected person.
- Reservoir: The infected person is the source or reservoir of the virus in this scenario.
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