The immune system includes certain types of white blood cells. It also includes chemicals and proteins in the blood, such as antibodies, complement proteins, and interferon. Some of these directly attack foreign substances in the body, and others work together to help the immune system cells. Forum Rules 1. Be civil. We encourage respectful discussion. Comments will be removed for insulting other users, bigotry, threats, broad generalizations, name-calling and anything that detracts from a conversation on a serious topic. 2. Avoid politics. Please keep discussing. Political debates end up repeating themselves, dominating the conversation and detracting from the quality conversation. 3. Keep information quality high. Share reliable, fact-based information with cited sources. Information about the pandemic evolves quickly. Do your best to rely on the best possible sources. Conspiracy posts, misinformation and amateur research and analysis will be removed. 4. Stay on topic. This forum is to discuss the pandemic and events that have happened. There are many places on Manadr forum to share opinions on a wide variety of topics. 5. Don’t repeat yourself. Posting the same comment over and over distracts from the conversation and crowds out other voices. Repeated comments will be removed. 6. Accounts can be suspended for repeatedly violating the rules.