72 



i. I nf 1 u enza: (a) Summer epidemic 1918. 



(b) Autumn and winter epidemic 1918—10. 



(c) Epidemic in the beginning of 1020. 



(d) „ t „ „ n 192 2- 



2. "Whooping-cough. 



3. Measles. 



4. Tuberculosis. 



5. Meningitis. 



6. Health}* persons: (a) Recently enrolled soldiers. 



(b) Other healthy people. 



7. Animals. 



A minor part of the investigations of the first few months 

 were undertaken by the then head of the department, Prof. 

 Oluf Thomsen, and by my deceased colleague, Dr. Frederik 

 Thorborg. 



1. Influenza. 



For the comprehension of what follows it is necessary to 

 state that influenza here in Denmark occurred in 4 epidemics, 

 July— Sept. 1018; Sept. 1018— May 1010; Jan.— April 1020; and 

 Jan. — April 1022. The first epidemic was very mild, but there 

 was a considerable mortality in the two following ones, while 

 the last was again more benign in nature although more serious 

 than the first. With respect to the number of cases of the 

 disease reported per month the reader is referred to the graphic 

 representation on p. 86. 



(a). Summer epidemic 1918. 



In July 1 9 1 8 inoculations from the naso-pharynx 

 were made from' 135 soldiers with influenza, mostly uncompli- 

 cated!. ! 



The technique used in these cases and in the subsequent 

 inoculations was as follows: the secretion was removed by means 

 of cotton-wool on a rod bent at an angle, which was introdu- 

 ced through the mouth up behind the soft palate. Care was 

 taken that it did not touch any mucous membrane except that 

 of the naso-pharynx. The material was rubbed off on to a 



