Covid is not nearly as high on the priority list for many third world countries as it is for the US. Here covid shuts down everything. In many African countries it is an order of magnitude less impactful than malaria.
DOI: 10.1128/mBio.02628-20
For some reason this hasn't been well covered in the media. I got an MMR booster in June based on preliminary findings, my GP thought I was insane.