596 



Plague 



from place to place by fomites, that occurs in epidemic form among 

 the lower animals as well as among men, and that can be trans- 

 mitted from man to man and from lower animals to man by biting 

 insects, must inevitably become a source of anxiety to the sanitarian. 

 The preventive measures must take account of men, rats, and 

 goods. If vessels are permitted to visit and leave a plague-stricken 

 port, means must be taken to see that all passengers are healthy 



Fig. 236. — Plague-infected rat. A composite picture, illustrating some of the 

 common naked-eye pathological changes found in various organs and tissues in a 

 plague-infected rat. Note (o) marked subcutaneous congestion causing a 

 peculiar pink appearance of the tissues; (6) submaxillary bubo; (c) subcutaneous 

 punctate hemorrhages most frequently found in the neck; (d) marked congestion 

 and hemorrhages in the thoracic cavity, especially in the lungs; (e) advanced 

 stage of mottled granular liver; (/) enlarged and congested spleen. 



at the time of leaving and have remained so. during the voyage, and 

 provision should be made at the port of entry for the disinfection 

 bi the cargo before the goods are landed. But the rats must be 

 given special consideration, for, so soon as the vessel reaches port 

 some of them jump overboard and swim to the shore, carrying the 

 disease with them. When a vessel visits a plague port, every pre- 



