Ha Do Quang

Huong Vu Thi Que

Khiem Ha Ba

Loan Huynh Thi Kim

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T rop. Med., 35 (4), 185-187, December, 1993 185SomeRecent Data on Dengue Epidemicin The South of VietnamHa Ba KHIEM, Do Quang HA, Vu Thi Que HUONG and Huynh Thi Kim LOANPasteur Institute, Ho Chi Minh City, VietnamINTRODUCTION (Epidemiological data)The Dengue situation in the South of Vietnam in 1993 is more severe than in 1992. Forthe period 1 January to 30 June 1993, a record 15,421 cases have been reported to thePasteur Institute of Ho Chi Minh city with 63 deaths (Table 1). This is a three-foldTable 1. Reported cases of DHF and deaths in the South of Vietnam,by province, January-June 1993Province Cases Deaths Case-fatality rate (CFR)(percentage)HQ Chi Minh city 1,157 3 0.26Tiln Giang 857 2 0.23BR Vung Tau 120 4 3.33Long An 244 2 0.82D6ng Nai 1,684 23 1.36Minh Hai 5,034 6 0.12VTnh Long 283 0 0.00Tra Vinh 345 1 0.29S6ng Be 1,280 5 0.39D6ng Thap 669 2 0.30Lam D6ng 245 0 0.00T§y Ninh 200 0 0.00An Giang 1,382 7 0.50Bin Tre 937 0 0.00Can Tho 264 0 0.00Soc Trang 292 1 0.34Kien Giang 428 7 1.63Total 15, 421 63 0.41186i ncrease over the corresponding period in 1992 (6,289 cases with 50 deaths). But the case-fatality rate for DHF decreases from 0.79 per cent in 1992 to 0.41 per cent in 1993.ISOLATION AND IDENTIFICATION OF VIRUSESThe Laboratory of Arbovirus (Pasteur Institute of Ho Chi Minh city) processed 73acute blood specimens for virus isolation during this period. Sixteen dengue strains wererecovered.Blood specimens were collected by venipuncture from children within 1-4 days of the3nset of illness. Anti-flavivirus IgG conjugated with FITC, serotype-specific monoclonalantibodies of Dengue 1 (1F1 and 15F3), Dengue 2 (3H5), Dengue 3 (5H4), Dengue 4 (1H10)and anti-mouse IgG conjugated with FITC were used in the identification. All biologicalDroducts were supplied by Dr. D. J. Gubler, CDC, Colorado, USA.T able 2. Dengue activity in the South ofVietnam in the first six monthsof 1993Month Cases DeathsJanuary 1 , 659 1February 984 5March 751 2April 1 , 399 6May 1,838 llJune 8 , 790 38Total 15,421 63T able 3. Provinces which sent blood specimens forvirus isolationLocality No. of Positivespecimens (percentage)H6 Chi Minh city 7 0Tien Giang 32 10 (31.25)Bin Tre 13 3(23.07)Long An 5 2(40.00)Vinh Long 13 1( 7.69)D6ng Nai 3 0Total 73 16(21.92)187Table 4. Results of identification of the isolatesLocality Number and type of the isolateDEN-1 DEN-2 DEN-3 DEN-4Tign Giang 8 2Bin Tre 3Long an 2Vmh Long 1Total 9 7The following are the highlights of the report :1. The number of dengue cases is still on the increase throughout the South of Vietnam.2. Dengue 1 strain is more dominant than Dengue 2 strain in 1993.3 , Among 9 dengue 1 strains recognized by monoclonal antibody of Dengue 1 1F1, themonoclonal antibody of Dengue 1 15F3 only recognized 2 of them. These results werealso notified in 1991 and 1992 outbreaks of DHF.

Some Recent Data on Dengue Epidemic in The South of Vietnam

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Some Recent Data on Dengue Epidemic in The South of Vietnam

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