The Spanish Influenza
The Spanish Influenza was one of the worst diseases in history, back then they thought it was as bad as the black plague in fact they almost called it the black plague. There is a disease triangle in which is in every disease first is the environment and the environment is what can really help the virus or almost kill it for an example the cold is really good for viruses. Next is the pathogen and that is what the virus is. The last is the host the one that is infected or with the Spanish influenza a human was the host. Here is a graph of the disease triangle.