Alistron, did you look at the links to the HPA website earlier? The ones that showed that the death rates from measles (ie the most serious complication) had greatly reduced from the 1940s when antibiotics became widely available to treat the potentially dangerous secondary infections such as pneumonia (wonder how many times I have had to refer to these figures - i must need to copy and paste them to make sure people actually read them)
Bruffin also kindly highlighted that clean water is the most important thing in reducing the incidence of disease (from the HPA website) The WHO have also highlighted the reduction of complications in developing countries (where many people are malnourished) by administering vitamin A - it halves the risk of complication. These are very real issues that unfortunately still impact on people all over the world - these are things we take for granted. So yes, many people who suffer complications from measles are malnourished and don't have access to clean water, good sanitation and adequate healthcare.
Re TB, you are aware that the tb vaccine is unreliable and ineffective and there is currently research going on to find a replacement aren't you?
Re Spanish flu in 1918 - what is the complication of flu that causes the most deaths? Pneumonia. How do we treat pneumonia these days? With antibiotics. What was not available for widespread use in 1918? Antibiotics. Also, how healthy do you think people who live on limited rations and sleep and eat in rat infested trenches are? I don't think that argument is going anywhere for you!
Re complacency due to herd immunity. I shall once again refer you to the HPA website that I linked to earlier showing that the UK has never had the required 95% MMR vaccine uptake to provide herd immunity to provide immunity to these diseases. In fact, we've been quite far off it for several years now.
Also, just to clarify, I didn't say that smallpox was wiped out by quarantine alone - just that it played an important role so you can't give the vaccine, the early versions of which actually killed more people than they saved btw, all the credit.
Bruffin to address one of earlier points, if the most serious complication of measles ie. Death has reduced do you not think it is also possible that other complications would also have reduced?