CHAPTER VIII

SECONDARY TERMINAL AND MIXED INFECTIONS.--THE EXTENSION OF INFECTION IN THE INDIVIDUAL.--TUBERCULOSIS.--THE TUBERCLE BACILLUS.--FREQUENCY OF THE DISEASE.--THE PRIMARY FOCI.--THE EXTENSION OF BACILLI.--THE DISCHARGE OF BACILLI FROM THE BODY.--INFLUENCE OF THE SEAT OF DISEASE ON THE DISCHARGE OF BACILLI.--THE INTESTINAL DISEASES.--MODES OF INFECTION.--INFECTION BY SPUTUM SPRAY.--INFECTION OF WATER SUPPLIES.--EXTENSION OF INFECTION BY INSECTS.--TRYPANASOME DISEASES.--SLEEPING SICKNESS.--MALARIA.--THE PART PLAYED BY MOSQUITOES.--PARASITISM IN THE MOSQUITO.--INFECTION AS INFLUENCED BY HABITS AND CUSTOMS.--HOOKWORM DISEASE.--INTERRELATION BETWEEN HUMAN AND ANIMAL DISEASES.--PLAGUE.--PART PLAYED RATS IN TRANSMISSION.--THE PRESENT EPIDEMIC OF PLAGUE 159