Kit has gone to visit Disney World. Unknown to him, he was exposed to someone with measles. Measles is an airborne disease that is one of the most infectious known. The R0 is 12-18 (on average, a single infected person will infect 12-18 other people in a population where no one is resistant). A few measles virus particles enter his lungs. Kit had never been infected with measles before, and had not been vaccinated because his parents were anti-vaxxers. The measles virus particles enter macrophages and dendritic cells in the lining of his lung airways.Which of the events listed below happens first?

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