8oo 



Figure I 



RESULTS OF INFECTIOUS BRONCHITIS 

 VACCINATION BV SPRAY 



(weeks) 



C/O 



CO 



O 



CD 



Zi 

 < 



I— 



z> 



LU 



UNH SPRAY 



PARENTAL IMMUNITY "— ■ 



PARENTAL 



IMMUNITY 



WEEKS 



9 |0 II IX 



CO 



O 



CD 



—I 

 < 



900, 



8oc 



600 



SOO 



400 



Figure H 



RESULTS OF INFECTIOUS 



BRONCHITIS VACCINATION 

 BY SPRAY 



UNH SPRAY 

 PARENTAL IMMUNlTy 



3 ■^ S 6 7 6 9 lo II la. i3 14- 15 



PARENTAL 

 IMMUNlTy 



REVACCINATIOM 



MONTHS 



10 



