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There is little doubt that the causative agents of most infectious diseases and especially those that are highly contagious enter the system by being inhaled, and invade the tissues primarily through the mucous membrane of the nose or other portions of the respiratory tract. Recent investigations have also proved that a person who has never had a certain disease may be a "carrier" of the germs of that disease otherwise than by the long recognized modes of carrying the bacteria about on hands, clothing, etc. For instance, a person exposed to diptheria may have his nasal cavity or throat infested with diphtheria bacilli even though not affected by the disease and such person may transmit the germs to another in whom the disease may develop.
The peculiar distribution of cases of epidemic cerebro-spinal meningitis and poliomyelitis, viz., the development of cases in different portions of a locality in individuals
ALBERT H. PLUGGING NOSTRILS WITH COTTON AS PROTECTION AGAINST DISEASES CONTAGIOUS BY INHALATION. JAMA. 1910;LIV(22):1780. doi:10.1001/jama.1910.92550480001001h
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