DENGUE IN INDO-CHINA. 23 



The Manche only remained about two weeks at Camranh; she then set 

 sail for Nhatrang. The first death occurred on the 17th of June. The 

 patient was an officer liabitually in good health and of a strong constitu- 

 tion. The boat was put in quarantine and isolated in a bay off the 

 Island of Tre. If the number of entries on the sick list are noticed it 

 becomes evident that the maximum was attained on June 20^ with 14 

 entries, then the number diminished progressively till June 27; but on 

 June 23, there was a second fatal case. This man, of robust constitu- 

 tion, died on the sixth day of his illness from a cardiac complication 

 which was c[uite unforeseen. 



On July 25, the Manche went to the lazaretto of the Nha-Be in 

 Cochin-China. The men were sent ashore and were distributed in 

 isolated pavilions, while the boat was disinfected by means of Clayton 

 gas. 



The epidemic was completely at an end on June 29. Some convales- 

 cent sailors were sent afterwards to the Saigon Hospital. There was no 

 contagion either in this town or off the coast of Annam, where com- 

 munication with Europeans and natives had been held unceasingly until 

 the quarantine was declared. 



The disease spread in so peculiar a manner that it is worth while to 

 call attention to this phase of the question. The ship's reservoir of water 

 is situated in the hold at the rear, and opens just under the midship- 

 men's and officers' quarters, as the plan shows. The epidemic began 

 particularly at the rear of the boat and the man in charge of the reservoir 

 was the first victim. The midshipmen and the other officers then 

 became sick, in fact, the first focus of the disease was formed there. 

 The commander, whose appartments were large and airy and also in that 

 part of the ship, caught the disease toward the end of the epidemic. 



The ciuarters of the sailors situated in the bow became infected a very 

 short time after those of the officers. The mechanics were also attacked 

 "en masse" and nearly all on the same day. 



Mosquitoes and flies were very numerous on board during the whole 

 period during which the epidemic continued. 



PREVIOUS EPIDEMIC OF DEN^GUE ON THE "mANCHE." 



The epidemic of 1907 was not the first which had occurred on board 

 the Manche. Dengiie fever had already made its appearance during the 

 previous year when she was lying at anchor near Hongay in Tonkin. 



The epidemic lasted two months, from July 21 to September 15, during which 

 time 114 out of 127 Europeans were affected and not a single Annaraese out of 

 30. The disease extended by little groups, the entries into the hospital succeeded 

 each other regularly, from 2 to 7 a daj-. The tj'pe of fever in which two attacks 

 were present was clearly observed in 85 cases, 5 eases were different from the 

 classic type and the others only showed one paroxysm. 



