| Name | Info | Provider | Link |
|---|---|---|---|
| Vaccines | free resource | MedlinePlus Health Information | https://medlineplus.gov/vaccines.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30949285/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/30949285 | |
| free resource | Pan African Medical Journal | https://www.panafrican-med-journal.com/content/article/32/10/full/ |