Makes me wonder if there is a chemical mechanism by which humans pass information to each other as well, to combat an infection. If one human develops an abilit

Makes me wonder if there is a chemical mechanism by which humans pass information to each other as well, to combat an infection. If one human develops an ability to combat and infection to a novel virus, is there a mechanism by which antibody information is shared to other people. Infections eventually always fizzle out in the end. In times of war and stress, how a society can come together and work in unison to defeat the threat. It seems like there's more to it than patriotism. Why should one individuals be willing to die for the benefit of others...Very often young man, who have not yet reproduced. Seems like an evolutionary dead end behaviour. Is there some Psycho/chemical mechanism by which its triggered. The way so many people were scared of covid, that fear spread and like a virus infected the society.