I essentially follow a zero carb diet. This means that I only eat meat and fat or at least the vast majority of the time. Where I completely believe that this way of eating is superior and leads to optimal health in general, I do not believe that it is a magical cure-all for all disease, especially infectious disease. Recently, at the Zeroing in on Health forum (I had been a member since inception), vaccinations were being discussed. Several people, including the founder of the site, Charles Washington, chimed in that they basically didn't believe in inoculation and that being zero carb would prevent them from contracting infectious diseases. WTF?
In Cancer, Disease and Civilization, Arctic explorer Vilahjmur Stefansson reported that although the Inuit were of great health they did demonstrate a tragic susceptibility to European infectious disease. Charles Washington tried to argue that this was because they had carbs introduced to their diets at that time and so that made them susceptible. Well I have no way of knowing if Stefansson observed infectious disease in carb eating and purely carnivorous Inuit or not but it is known that the rate of tuberculosis, for example, among the Saskatchewan natives dropped dramatically 40 years after they were first exposed to the disease. At this point the Inuit would have been eating a great deal of Western carby foods.
While the Inuit were dying of small pox and other viral diseases, measures to stop the spread of small pox were underway in Europe and the U.S. Keep in mind that at this same time, consumption of carbs and sugar in the U.S. was increasing on average. The small pox vaccination was invented in 1796 and by 1897, after wide spread vaccination programs had begun, the disease was almost non-existent in the U.S. Whether or not this was due to the vaccination programs doesn't matter here so much as the plain fact that while the Inuit populations were experiencing high rates of small pox their carb-eating counterparts to the south were experiencing reduced rates of small pox. Today, of course, small pox has been eradicated.
So in other words: There appears to be no correlation between diet and rates of infectious disease.