Teenagers contract the novel coronavirus almost twice as often as younger children but vaccines authorized in the United States are mostly for adults — Moderna’s for 18 and older, Pfizer’s for 16 and up.

This week, the world heard encouraging news about a vaccine for COVID-19.

On Monday, the pharmaceutical company Pfizer, and its partner BioNTech, said their experimental vaccine appears to work – and work quite well. A preliminary analysis suggests the vaccine is more than 90 percent effective at preventing COVID-19 symptoms.

Health officials hope to start vaccinating some Americans in a few months.

"The vaccine is on its way, folks," Dr. Anthony Fauci told a crowd Tuesday, via video link, outside Brooklyn Borough Hall.

But what about the rest of world, especially people in poorer counties. Is the vaccine "on its way for them?"