TikTok may be the platform of choice for catchy videos, but anyone using it to learn about COVID-19, climate change or Russia's invasion of Ukraine is likely to encounter misleading information, according to a research report published Wednesday.

Researchers at NewsGuard searched for content about prominent news topics on TikTok and say they found that nearly 1 in 5 of the videos automatically suggested by the platform contained misinformation.

Searches for information about "mRNA vaccine," for instance, yielded five videos (out of the first 10) that contained misinformation, including baseles...