Nicodemus said:
No matter how virulant, some section of the population will have some measure of immunity to or ability to attentuate a given virus. Most of the 55,000 people who die from Rabies each year are in Africa, and AFAIK there has never been a broad serological study to distinguish one catastrophic encephalitis from another. Rabies would be unique among all viruses if it were truly so lethal.
You mention these other diseases, but they ALSO do not have a 100% mortality rate, except for necrotizing fasciitis which is a condition brought on by bacterial infection, not a disease like the others (in your first list). You're getting a skewed view because of a lack of study due to the success of vaccines, or because of relative rarity. I'd add, you mention Ebola like it's 100%, and that's just not true.
http://en.wikipedia.org/wiki/Ebola_Zaire#Za.C3.AFre_EbolavirusI'm not arguing that these illnesses aren't often fatal, or in the extreme such as HIV, you DO have a massive pool that's studied, and only a very few who have ever (apparently) "beaten" HIV.
In response to your edit, I'm talking about infectious diseases, not conditions or congenital disorders. I thoughtthat was clear in context, but now I'm spelling it out.
Look at my original post, complete with winking-face. Did it look like I was being literal in any way? What are "various forms of decapitations"? Your reaction seems extreme.
Actually I stated that there are other diseases that "essentially have a 100% mortality rate", that is they do not have a 100% mortality rate, but certainly very close too. In the case of Ebola, I pointed out certain strains (untreated) essentially have a 100% mortality rate. You are forgetting that those "90% mortality rates" tagged on Ebola-Z includes people who are being aggressively treated for their symptoms (fluid replacement therapy, oxygen, clotting agents, fever reducers, etc). Without those treatments, the mortality rate for some strains of Ebola would, for all intents and purposes be 100%.
I think the point you've missed now for 2 posts is; "Rabies is 100% fatal if
untreated". The operative word here (used in the post you initially disagreed with) was untreated. That post was correct, if left untreated rabies is 100% if you acquire an active infection from it. There is no documented cases of people having an active rabies infection and surviving it without treatment.
Having a genetic mutation which prevents a virus from causing an acute or latent infection obviously does not affect mortality rate; because that group is excluded from people who are able to be infected with the virus/disease.
Same thing with HIV. There is no one who has survived, untreated, a latent HIV infection. There are anomalous people who have mutations to receptors (Either CD4 or CCR5) HIV requires to establish a latent infection and ergo can clear the virus from their body.
Even spelled out for infections disease, there are ones if untreated are 100% fatal. I pointed this out in my post. NF is a infectious disease (Yes the underlying bacteria which cause NF can be transmitted person to person and could also develop into NF in the new host--Certainly not common, but it can happen). Untreated 100% fatal. You're body doesn't spontaneously clear the infection. Tetanus--You don't clear a C. tetani infection and its really the toxin that does you--Constant muscle contraction, respiratory failure and all that bag of flowers. Even with treatments tetanus infections have a 30% mortality rate.
Creutzfeldt-Jakob, Spongiform Encephalopathy, Kuru and Fatal Familial Insomnia are prion diseases and infectious. They are 100% fatal, whether we treat symptoms or not...Le Chatelier and his principle it turns out, is not your friend
Pneumonic plague is another one where people have a genetic basis which bars the bacteria (
Y. pestis) from establishing an acute infection, incidentally this is probably where people who got an "immunity" to HIV got it from. Regardless, if you don't have this genetic basis, get an acute respiratory infection from pneumonic plague and go untreated--You'll die, essentially 100% of the time. Our bodies and immune systems simply aren't equipped to clear some infections.