#2406: Viral Vector Immunity
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Transcript
[A large wooden horse statue on wheels stands before a city wall, upon which are standing several warriors who are shouting and brandishing spears.]
Warrior 1: Look! It's a statue of that horrible animal that trampled Steve!
Warrior 2: Burn it!
Warrior 3: Smash it!
Warrior 4: Push it into the gorge!
[Caption below the panel:]
How vaccine failure due to viral vector immunity works
(Sourced from explainxkcd.com)
Title text:We've secretly replaced this customer's instant coffee with our patented substitute. Let's see what she ... uh oh, I think she spotted us through the window. Now she's getting something from the closet ... oh jeez, she has a sword! Run!!