| Name | Info | Provider | Link |
|---|---|---|---|
| HIV | free resource | MedlinePlus Health Information | https://medlineplus.gov/hiv.html |
| free resource | NCI CPTC Antibody Characterization Program | https://antibodies.cancer.gov/detail/CPTC-CD4-1 | |
| free resource | European Centre for Disease Prevention and Control (ECDC) | http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20805 |