https://www.centerforhealthsecurity.org/our-work/exercises/2022-catastrophic-contagion/

becoming a pandemic with a higher fatality rate than COVID-19 and disproportionately affecting children and young people

They can use cholera for it. It’s now in “Disease outbreak” section of WHO:

https://www.who.int/emergencies/disease-outbreak-news/item/2022-DON426

Also it’s interesting how often Wikipedia mentions “children” in the context of being more vulnerable:

https://en.wikipedia.org/wiki/Cholera

• It matches the young / children in the post.

• It has higher fatality rate than covid, which also matches the post.

The vaccines for cholera - you swallow them. No injection. People don’t suspect that much.