INFECTIOUS DISEASES 431 



wearing shoes are also necessary in order to keep the 

 young worms away from the skin. The disease is widely 

 spread in the warmer parts of the United States, and is 

 the cause of much suffering which was once supposed to 

 be due merely to shiftlessness and laziness. 



SUMMARY 



1. Infectious diseases are common during cold and damp 



weather because then people shut themselves in close 

 rooms containing disease germs. 



2. Disease germs may spread from a mild case of infec- 



tious disease as well as from a severe case. 



3. Resistance in infectious diseases can be increased by 



anything which promotes the vigor of the body. 



4. The germs of infectious diseases are found in the dis- 



charges from the bodies of the sick. 



5. Quarantine and proper sewage disposal are necessary 



in suppressing infectious diseases. 



6. The toxins of disease germs cause a fever. 



7. Colds are caused by disease germs, and are infectious. 



8. A person who has diphtheria should be quarantined 



and should receive antitoxin. 



9. Vaccination is the only safe and sure preventive of 



smallpox. 



10. Antitoxin is a safe and sure preventive of diphtheria. 



1 1. Typhoid fever and other intestinal diseases are spread 



by impure water and milk, and by house flies. 



12. Rats and stray dogs are a menace to health. 



DEMONSTRATIONS 



183. Show the class specimen vaccine points and tubes of antitoxin 

 borrowed at a drug store. Explain the ease-and safety of their use. 



184. Show a thermometer which is used in taking the temperature 

 of the body, and explain how it is used. 



