Neglect or indulgence is an etiological factor of the first importance, as we have already seen.
Syphilis is not an etiological factor in any of these groups.
The one etiological group then becomes split up into two which may be designated as the dispositional and the definitive groups.
In the second place, it is possible that the etiological factor is alcohol.
In respect to food and indigestion as etiological factors there are several points requiring more explicit statement.
The influence of this as an etiological factor in derangement of digestion can scarcely be exaggerated.
Various rheumatic and nervous disorders are not infrequently associated with it, and are doubtless of etiological significance.
As an etiological factor certain morbid mental states rank first, as we have seen, in the order of importance.
A microbacillus has been found by several observers, and credited with etiological influence.
This briefly covers the whole ground of the etiological relations of the disease.