24 VASSAL AND BROCHET. 



We will only euiunerate the principal sj-mptoms, reserving the discus- 

 sion until later. Sudden attack, headache, rachialgia, and pains in the 

 muscles were constantly noted. The initial eruption seemed simply 

 a congestive state of the face; a final eruption which was more empha- 

 sized, showed itself in half the eases; it had in general a furfuraceous 

 aspect with ulterior des([namation. A tendency to syncope was noted in 

 some of the patients. There was anorexia and nausea as well as great 

 constipation. The complications consisted only of boils. The illness 

 lasted from 'five to six days. Sometimes the convalescence was long. 



The report mentions the presence of a great number of mosquitoes 

 {GulicidcB exclusively) during the epidemic. The boat had been in the 

 Bale d'Halong since December, 1905; the six preceding months she had 

 been anchored off Hongay and Haiphong. An epidemic of dengue pre- 

 A'ailed simultaneously among the sailors of the "defense mobile" of 

 Hongay. The colonial troops in barracks ashore do not appear to have 

 been attacked. 



EPIDEMICS OF DENGUE IN INDO-CHlNA. 



There is no doubt that dengue has existed for a long time in Indo- 

 China. It rarely manifests itself in the form of a generalized epidemic, 

 as in 1866 (d'Ormay) and in 1895-6 (Nogue). On the other hand, 

 it gives rise to local epidemics which are in general restricted to the coast, 

 Saigon and the Baie d'Halong constituting the principal areas. The 

 epidemics attract little attention and often very little importance is at- 

 tached to them. 



Sporadic cases of dengue do not appear to be rare at Saigon, on boats 

 as well as on shore. Such cases have been observed at certain epochs and 

 in small groups. ISTew arrivals who pay their tribute to the disease often 

 apply the vague term of acclimatization to it. 



The epidemics of 1895-6 have been described by Nogug. We will first discuss 

 a recent epidemic on the Kersaint which Dr. Cazaniian, of the French Navy, has 

 described comparable to that on the Manche. This boat coming from Shanghai 

 and Tonkin, anchored off Saigon on July 7, 190.5. The first ease of dengue appeared 

 on July 11, 115 men out of 150 were afl'ected and from 1 to C entered the hospital 

 per day. The epidemic came to an end at the beginning of September. 



There is no reference in this instance to the susceptibility of the Annamese. 



The author, striving to reconcile dengue with inflenza, is tempted to accord an 

 important role to secondary phenomena, but in spite of this, he traces such a 

 complete picture of the epidemic that no doubt on the subject can remain. The 

 temperature charts are very characteristic. The pains in the muscles, rachialgia, 

 and headaches were not absent. Tlie initial rash was longer and more distinct. 

 The complications were not without gravity, since Cazamian noted albuminuria 

 twice, and cardiac symptoms three times, which he connects with angina pectoris. 



There were many flies and mosquitoes on the Kersaint during the epidemic. 



It is stated that in Maj', 1904 or 1905, dengue broke out in Saigon, especially 

 severely on the boats of the "defense mobile." We have not been able to procure 

 the documents relative to this epidemic, but we know that three patients suc- 

 cumbed very quickly. 



