18 



The Philippine Journal of Science 



1918 



Table VIII. — Relation of percentage infected and average number of oocysts 

 per infected mid-gut to percentage of crescents in carrier at time of 

 feeding. 



All species. 



Crescents per 100 leucocytes. 



Anopheles umbrosus, barbi- 

 rostris, and si iiensis deducted. 



I 



Dis- 

 sected. 



Infected. 



Average Dis 

 oocysts. 



sected. i Infected - 



I 



\ Per cent. 



0.5- 2.0 22 j 50.2 3.0 



2.1-10.0 .1 276 j 22.5 6.4 



10.1- 25.0 | 298 j 18.5 15.9 



25.1- 50.0- 91 27.5 20.8 



50.1-75.0 o; 0.0 0.0 



75.1100.0 16 12.5 j 6.5 



Total 703 22.2: 11.9 



17 

 219 

 207 



90 







16 



Per cent. 

 64.7 

 28.3 

 27.0 

 28.8 

 0.0 

 12.5 



Average 

 oocysts. 



3.0 



6.4 



15.9 



20.8 

 0.0 

 6.5 



549 



8.4 



11.1 



A certain carrier, patient 1997, had at one time the remark- 

 ably high percentage of 161.5 crescents. Some of the higher per- 

 centages of No. 1997 could not be included in Table VIII, since 

 this carrier was at that time associated with carriers of much 

 lower percentages on the same lots of mosquitoes. Some features 

 of this carrier are of especial interest, and the data are given 

 somewhat in detail. He was a Chinese, male, aged 24, and 

 formerly a coolie on a rubber estate. He had been in the Fed- 

 erated Malay States about two years. He had a history of fever 

 without rigor about one and one-half years previously, but had 

 never before been in the hospital. When he came under our 

 observation he had entered the hospital for chancre and did 

 not know that he had malaria. Certain data on this case are 

 included in Table IX. 



This case is remarkable for the high percentage of crescents 

 and for the lack of symptoms of malaria in the presence of many 

 parasites, rings as well as crescents. The fever on July 1 is 

 apparently the only symptom observed that can be ascribed 

 to malaria. This carrier was used for many mosquitoes and 

 was very "potent" in infecting them. Data cannot be given 

 for all cages, since this carrier was generally used in connection 

 with other carriers on the same cages. In one cage he was the 

 sole carrier. This cage gave: Anopheles kawari, 6 positive of 

 7 dissected; maculatus, 1 positive, 1 dissected; and fuliginosus, 

 1 dissected, negative. There were four exposures to the carrier, 

 although some mosquitoes were introduced into the cage after 

 the first and second exposures. Gametes ranged from 161.4 per 

 cent to 57.7 per cent. The one successful infection of sinensis, 



