The video shows a quick image of Jackson’s mother smiling in reaction to the cake.
The video went viral, earning more than 74,000 likes on TikTok as of this writing.
TikTok is a fast-growing social video app popular among teenagers. It has 500 million global monthly active users.
“I am happy that I’m vaccinated, because I have seen that some old-time diseases are coming back,” Jackson said. “I’m glad my mom hasn’t contributed to that.”
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Diseases like measles, which used to be eradicated in the United States, have been coming back. Doctors call this trend "unacceptable" because scientific research has found vaccines save lives.
A study estimated vaccines protecting against 13 diseases have prevented more than 40,000 deaths.
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The FDA has said it may step in to strengthen vaccine laws.