Besides the LLC’s print texts and reference books we have access to a number of sites. Please avoid using Wikipedia for this type of research. Although Wikiedia is handy, it may not always be accurate.
The district offers online Encylopedia and Databases. Explora 8-12, World Book Advanced and Science in Context all offer good options for your topics. Explora and Science in Context offer numerous curated current articles and videos on the topic. World Book offers a simple, but thorough article. I have also listed several online government sites which focus on diseases.