Enzyme-linked immunosorbent assay (ELISA) simplified

Why was the ELISA test sad after a negative result? Because it is very sensitive! HAHAHA! Sensitive, get it? HAHAHA!

Once you get an autoimmune disease, you are more likely to get others. Why?

Question: Hi, Can you explain why once you get an autoimmune disease you are more likely to get others? Thanks!

How do anti-TNF biologics work?

Question: I became interested in immunology when I was diagnosed with Rheumatoid Arthritis (and Crohn's disease) I have taken several anti-TNF biologics. Could you please illustrate how they work? Thanks!