In a patient dying in the early stages of an epidemic there may be no diphtheritic manifestations, though the tissues and secretions are filled with bacteria. As, however, the epidemic gains headway, the lesions of the generative apparatus, and especially of the external organs, which are most exposed to air, become covered with patches which swarm with micrococci. Under the conditions named it is certainly more in accord with ordinary scientific reasoning to conclude that the micrococci play an important part in the production of puerperal fever than that the puerperal fever produces the micrococci.
To be sure, bacteria or their spores are always present in the air, and it may be fairly asked how patients are ever spared from their perverse industry. The answer is, that the effect produced by the atmosphere of a hospital is dependent partly upon the quantity, and partly upon the quality, of the suspended germs. Floating spores, when sparsely distributed, rarely possess the power of invading a healthy organism. In the inauguration of an epidemic the first patient severely attacked is usually one whose powers of resistance are broken down by prolonged labor, by hemorrhage, by poverty, or some other condition leading to impaired vitality.
Puerperal-fever epidemics due to contamination of the atmosphere, and not to direct contagion, do not at once reach the maximum of intensity. At first the temperature tables indicate the prevalence of milk fever; next follow cases closely resembling those of mild paludal poisoning; and, finally, if these warnings are unheeded and reliance is placed upon antiperiodic remedies rather than upon prompt closure of the threatened ward, the pestilence develops. In the conduct of lying-in hospitals it should never be forgotten that with the multiplication of the septic germs the danger increases.
At the same time, the quality of the agents which pervade the air where hospital patients are confined is an important element in the genesis of febrile outbreaks. The bacterium termo, which causes putrefaction, is not in itself, as we have already mentioned, a source of danger. A stinking odor is not necessarily incompatible with a low mortality-rate. The importance of the common forms of bacteria, according to Pasteur, results from the fact that by their power to consume oxygen they pave the way for the active development of the pernicious germs, nearly all of which thrive only in media in which that element has been materially diminished. Again, there is reason to believe that the same germs are not50 always equally active for evil. Gravitz claims that the ordinary varieties of aspergillus and penicillium found everywhere on the surface of the ground, on moistened walls, on food of every variety, on decaying leaves and fruit, and whose spores are universally present in the purest air, can by a succession of cultures be gradually brought to flourish in a warm alkaline fluid, and that they then acquire the capacity to penetrate living tissues, to proliferate in them, to excite local necroses, and to cause death in the course of three days. The resistance of micrococci to carbolic and salicylic acids is found experimentally to depend in a measure upon the nature of the vehicle in which they are cultivated (Buchholz). The action of septic fluids varies too with the age of the infusions, with the materials employed, and with the conditions under which the poison-germs are generated.
50 Gravitz, "Ueber Schimmel vegetationen im thierischen organismus," Virch. Arch., vol. lxxxi, p. 355.
Micrococci multiply in hospitals when organic materials favorable to their growth are present in sufficient quantities. Perrin, Quenquand and others have shown that the hospital wards in Paris, especially those upon the surgical and maternity divisions, contain an infinite number of vibrios, bacteria, and all the coccus forms (Charpentier). Robin51 has demonstrated the existence of albuminoid matters in water condensed upon vessels containing freezing mixtures and placed in overcrowded wards of hospitals. When the results of crowding become manifest, these albuminoid matters not only impart a fetid odor and putrefy with great rapidity, but rapidly impart putrefaction to healthy muscle and normal blood with which they are brought into contact. Pasteur was able by the microscopic examination of the lochia from patients in the services of Hervieux and Lucas-Champonnière to predict, from the character of the contained organisms, an impending attack of fever in advance of the slightest symptom betokening danger.
51 Leçons sur les Humeurs, Paris, 1867, p. 195.
It is unquestionably the lochial discharge which makes it such a difficult task to keep a maternity ward in a healthful condition. Putrid blood has been found to be the most favorable material for septic experiments. It was noticeable in Bellevue Hospital that febrile outbreaks always arose in, and were usually confined to, the ward in the hospital which, by a bad arrangement, was assigned to patients for the first four or five days following confinement—i.e. during the period of the lochia cruenta. As puerperal fever is rare after the fifth day, this at first sight would seem natural. But if a patient was transferred directly after confinement, during one of these unhealthy periods, to the ward containing the patients who had passed the first five days, but had not completed the ten days, she would escape the fever. It was always the same ward that required to be disinfected. In a communicating apartment all the confinements took place, and at all times, therefore, the conditions were present for loading the atmosphere with the products of decomposing blood. In the summer months, so long as the windows were open and the air was diluted by the continuous passage of fresh currents, the patients enjoyed immunity from nosocomial malaria. In the autumn, so soon as it became necessary to close the windows partially on account of the cool nights, it was not uncommon for the more trivial disturbances, such as so-called milk fever, the hospital pulse, and catarrhal affections of the genitalia, to manifest themselves. Through the months of February, March, and April the mortality was usually greatest. During the winter months there was, as a rule, crowding of patients, insufficient ventilation, stagnation of the air, and the rapid accumulation of disease-germs. That the later winter months should prove the most perilous is in accordance not only with the theory of continuous accumulation, but with the experimental fact that weeks sometimes elapse before a decomposing substance acquires the highest degree of virulence.
Apart from the nosocomial malaria of hospitals, there is reason to believe in the influence at times of certain general widespread atmospheric states which affect the entire community. In the year 1871 the mortality from childbed in New York was 399; in 1872, 503; in 1873, 431; in 1874, 439; and in 1875, 420. Now, the excess in the deaths for 1872 was due wholly to an increase in the cases of metria, those from ordinary accidents remaining nearly the same as in the preceding years. The disease certainly did not extend into the city from the hospitals serving as foci, for the mortality at Bellevue Hospital was hardly more than half the usual average. There was no especial mortality that year from either diphtheria, erysipelas, or scarlatina, but the aggregate mortality was the largest known in the history of the city. There are no positive data connecting the civil deaths from puerperal fever in 1872 with parasiticism, but the prevalence of epizoötics, of epidemic catarrhal affections, of peculiarly fatal forms of pneumonia and other diseases which are now attributed to the presence of minute organisms in the atmosphere, renders such a source highly probable.
It is proper to say here that, though the argument is very strong in favor of regarding the genitalia of puerperal women as the exclusive point of entry of infectious materials into the system, it seems impossible at the present time to make all the facts coincide with such a theory. I have the records of a number of cases occurring during an epidemic of puerperal fever in which patients were either attacked with fever previous to parturition, or in whose cases the unusual length of labor, the frequency of post-partum hemorrhage, and the imperfect contraction of the uterus immediately after confinement were signs of some abnormal influence exercised upon the economy at an early period of labor previous to the existence of traumatism. That deleterious materials may find other channels for entering the system than a wounded surface is evidenced by the cachectic condition not unfrequently produced in physicians by too assiduous attendance in dissecting-rooms and places in which post-mortem examinations are conducted. One severe and rapidly fatal case of puerperal fever which occurred in Bellevue Hospital I find it impossible to attribute to any other cause than that the woman for five months previous to her confinement served as a helper in a lying-in ward. The post-mortem examination disclosed no special local lesions, but her symptoms were those of intense septicæmia. French writers report instances of toxæmic conditions developing in young midwives during puerperal-fever epidemics. While we are not prepared to go as far as Tarnier, who says, "It is probable that the lungs, by their extent and activity, offer conditions most favorable to absorption, and that often, if not always, it is by them that poisoning occurs," it does not yet seem time to give up the idea that under exceptional circumstances the respiratory and the digestive tracts may allow the passage of materials of a septic character.