6 Ziegler, A Text-book of Pathological Anatomy and Pathogenesis, translated by Macalister, vol. i. p. 319, London, 1883.
| FIG. 13. |
| Oïdium albicans, from the Mouth in a case of Thrush (Küchenmeister). a, fragment of a separated thrush-layer implanted in a mass of epithelium; b, spores; d, thallus-threads with partition walls; e, free end of a thallus somewhat swollen; f, thallus with constriction, without partition walls. |
ETIOLOGY.—Thrush is usually a symptomatic disease, secondary to an acid condition of the fluids of the mouth. Athrepsia (Parrot, Meigs and Pepper), or innutrition, is the presumable predisposing cause. Negligence in maintaining cleanliness of the mouth and of the articles which are placed in it is regarded as the main exciting cause. It occurs both in the adult and in the infant, but it is much more frequent in infancy and in early childhood. It is most frequently encountered in asylums and hospitals for children, being often transmitted from child to child by the nurse or by means of the feeding-bottle. The poor health of the child seeming less accountable for the disease than the unsanitary condition of the wards, buildings, and surroundings, it is consequently much less frequent in private than in public practice. It is more frequent in the first two weeks of life than later. Seux observed it within the first eight days in 394 cases out of 402 (Simon). It is much more frequent during summer than at any other season, more than half the cases (Valleix) occurring at that portion of the year.
In senile subjects, in adults, and in children more than two years of age it is cachectic, and observed chiefly toward the close of some fatal and exhausting disease, such as diabetes, carcinoma, tuberculosis, chronic pneumonia, enteric fever, puerperal fever, erysipelas, chronic entero-colitis and recto-colitis, and pseudo-membranous sore throat. It is sometimes observed in the early stage of enteric fever.
Meigs and Pepper, apparently following Parrot, deem the central cause to lie in a certain failure of nutrition under which the general vitality slowly ebbs away. They are inclined7 to recognize a causal factor in a deficiency in the supply of water in much of the artificial food administered to young subjects. The normal acidity of the fluids of the mouth of the newly-born (Guillot, Seux) is not sufficiently counteracted until saliva becomes abundant. Premature weaning, entailing, as it often does, the use of improper foods, renders the child liable to gastro-intestinal disorders. To this add want of care of the bottle and nipples, of the teaspoon or pap-boat, and of the mouth itself, and the conditions are fulfilled in fermentations of remnants of milk taking place without and within, which produce the acid condition of the fluids and secretions of the mouth said always to accompany and precede the development of the disease (Gubler).
7 A Practical Treatise on the Diseases of Children, 7th ed., Philada., 1882.
The theory of contagiousness seems established (Guillot, Berg, Gubler, Robin, Trousseau). This has been further demonstrated by experiments upon sheep (Delafeud), in which thrush has been implanted whenever the animals were unhealthy, but not otherwise.
PATHOLOGY AND MORBID ANATOMY.—The mucous membrane of the mouth within a few hours after its invasion by thrush is seen to be covered to some extent by minute masses of a granular curdy substance adherent to the tissues, which often bleed slightly when the substance is forcibly removed.
In children much reduced by inanition or severe disease, much of the deposit soon coalesces into a membraniform product, grayish or yellowish from rarefaction by the air, or even brownish from admixture of blood. By the same time the general congestion of the mucous membrane will have subsided into the pallor of anæmia. Though tolerably adherent when fresh, the deposit when older often becomes loosened spontaneously, so that it may be removed by the finger in large flakes without producing any hemorrhage whatever.