It is not for a moment meant that no notice is to be taken, nor opinion asked, as to the cause of excessive size of the abdomen, for its distension may be due to real disease; but it is yet worth while to remember that its mere size is not of itself evidence of disease, nor cause of grave anxiety.
Worms.—There is no mistaking or overlooking the existence of worms when they are really present. Their presence, however, is often suspected without any sufficient reason. Ravenous or uncertain appetite, indigestion, flatulence, undue size of the abdomen, a dark circle round the eyes, itching of the nose and of the entrance of the bowel, a coated tongue, and offensive breath are no real proof of the presence of worms, and do not justify the frequent repetition of violent purgatives or of so-called worm medicines. The only real proof of the presence of worms is their being seen in the evacuations.
The worms commonly found in children are either the round-worm, which resembles the earth-worm, the thread-worm, or the tape-worm; the appearance of each of which is clearly indicated by its name. None of them are spontaneously generated in the body, but they are all introduced from without; their eggs, or, as they are technically called, their ova, being swallowed unperceived in some article of food, or drink. A proof of this is afforded by the fact that an infant, so long as it is nourished exclusively at the breast, never has worms.
The round-worm occasions the fewest symptoms, and is rather an object of disgust than of grave importance, at least in this country, where it seldom happens that more than two or three are present. In other countries, as some parts of Italy, for instance, where the drinking water is bad and stagnant, they are sometimes found in great numbers, as thirty or forty, and it is then not easy to determine whether the symptoms which accompany them are produced by the worms, or by the unwholesome character of the water in other respects.
They appear to live on the contents of the intestines, and do not adhere to them, as the tape-worm does, and hence their comparative harmlessness, and they have no power, as has sometimes been mistakenly imagined, of perforating the bowels, and of thus producing grave mischief.
The thread-worm is the commonest variety of these creatures, and has the peculiarity of inhabiting the lowest twelve inches of the bowel, where it produces much irritation and causes very distressing itching. It is often present in great numbers, and is so rapidly reproduced, that in a week or two after it has been apparently got rid of, it may again be found as numerous as before. Certain articles of food seem to favour its development, such as pastry, sugar, sweets, beer, fruit, and anything which is apt to undergo fermentation, and thereby to impart to the evacuations a specially acid character. These worms are often accompanied with more or less marked symptoms of indigestion, but otherwise the local irritation is usually the only indication of their presence. They produce, indeed, such disturbance of the nervous system as may attend indigestion in any of its forms, but I have never but once known convulsions occur apparently due to their presence in great numbers, and ceasing on their expulsion; and this was in a child between eighteen months and two years old.
The tape-worm is developed in the human body from a minute germ or ovum; one form of which exists in the flesh of the bullock, the other in that of the pig; and which seems to require for its growth the favouring conditions of warmth and moisture which are found in the intestines. It fixes itself to the lining of the bowels by means of its mouth, which is furnished with minute tentacles, and it thus derives its support from the juices which it imbibes. The head is so small as not to be seen distinctly without a magnifying glass; and immediately beyond it the jointed body begins; at first, scarcely bigger than a thread of worsted, but gradually enlarging, till at the distance of three inches it is an eighth of an inch wide, and thence rapidly widens till each joint is half an inch wide, and from a third to half an inch apart. It does not exceed these dimensions, even though it may grow to the length of four or six yards. Portions of it, sometimes a yard or two in length, are thrown off from its lower end occasionally, and this occurrence often gives the first indication of its presence, the worm continuing to grow as before, and fresh portions being detached from time to time. It does not appear that the worm has the power of reproducing itself; hence its French name of ver solitaire, and the occasional presence of two or three would seem to be due to the development of two or three distinct ova within the intestine.
Deriving as it does its support from the system of the child, and not as the other worms do from the contents of the bowel, the tape-worm often produces graver inconveniences. It sometimes causes uncomfortable colicky sensations, which may even be very distressing, and the disorders of digestion which accompany it are often very considerable; certainly more so than in the case of the other varieties of worms; but I have seen no instance of convulsions which could be attributed to them, notwithstanding the generally received opinion to the contrary.
When the existence of worms is suspected, one or two doses of a simple aperient, such as castor oil, repeated two days successively, seldom fail to produce evidence of their presence; which in the case of tape-worm is also furnished by the spontaneous detachment of some of the joints. It must be remembered, however, that until the head has been detached from its connection with the bowel, nothing has been gained, and the tape-worm will in a short time grow again. To obtain the detachment of the head it is necessary that any worm medicine should be given when the intestines are empty. I am, therefore, always accustomed to give a dose of castor oil about two hours after the child's mid-day meal; and to send the child to bed as soon as the aperient begins to act, and to give it no more food except a biscuit and a little milk and water during the rest of the day. In the early morning, the special worm medicine is given, and over and over again I have known the worm to be brought away completely after many previous failures. When the smallness of the joints shows that the greater part of the worm has been thrown off, and that little more than the head remains, it is necessary to have recourse to the unpleasant proceeding of mixing the evacuations with water, and then straining them through muslin, in order that the doctor may by means of the microscope make out whether or no the head has been really detached. This is no question of mere curiosity, but a matter of the gravest moment, since nothing has been really gained so long as the head of the worm remains adherent to the bowel.
Precautions such as these are not needed in the case of the other kinds of worms. Thread-worms, however, are best attacked in their habitation; that is to say, in the lower bowel, by means of lavements. It is, therefore, desirable before they are administered that the bowels should be emptied by a dose of castor oil.