Protein Non Struktural-1 (NS-1) dari virus dengue terbukti menjadi penanda
untuk diagnosis awal infeksi dengue. Bio-Rad NS1 Ag adalah salah satu alat
diagnostikdi Indonesia yang menggunakan NS1.Tujuan dari penelitian ini adalah
untuk mengukur sensitivitas dan spesifisitas kit pada virus dengue serotype-2
(DENV-2), virus dengue serotype-4 (DENV-4) dan infeksi campuran Uji
diagnostik dilakukan selama36 bulan (Maret2010 ?Februari 2013). Sebanyak 102
pasien dengan demam kurang dari 48 jam memenuhi kriteria inklusi dalam studi
ini. Reverse Transcripion-Polymerase Chain Reaction (RT-PCR) atau isolasi
virus di cell line C6/36 atau kenaikan titer antibody dijadikan sebagai standar
baku penentu infeksi dengue. RT-PCR juga digunakan untuk menentukan serotipe
virus. Analisis statistik dilakukan dengan menggunakan SPSS versi 17.0. Variabel
data binomial disajikan dalam interval kepercayaan 95%. Sensitivitas dan
spesifisitas kit diagnostik disajikan dalam tabel 2x2 dan area di bawah kurva
(AUC) dari Receiver Operating Characteristics Curve. Dari 102 pasien secara
berurutan didapatkan DENV-1, DENV-2, DENV-3 dan DENV-4, adalah 17
(16.7%), 21 (20.5%), 16 (15.7%) dan 4 (3.9%). Pada penelitian ini juga
ditemukan infeksi campuran yaitu campuran (i)DENV-1 dan DENV-2, (ii)DENV-
1 dan DENV-3, (iii)DENV-1 dan DENV-4, (iv)DENV-1, DENV-3, dan DENV-4,
(v)DENV-2 dan DENV-4 dan (vi)serotipe yang tidak diketahui secara berurutan
adalah 2 (2.0%), 3 (2.9%), 1 (1.0%), 1 (1.0%), 1 (1.0%), dan 2 (2.0%).
Sensitivitas dan spesifisitas masing Bio-Rad NS1 Ag Strip untuk mendeteksi
infeksi DENV-2 adalah 76,2% dan 100% (95% CI, 76.8% to 99.3%). Sementara
itu, sensitivitas dan spesifisitas strip untuk mendeteksi infeksi DENV-4 adalah
50% dan 100% (95% CI, 50% to 100%). Sensitivitas dan spesifisitas Bio-Rad
NS1 Ag Strip pada infeksi campuran adalah 100% (95% CI, 95% to 100%). Bio-
Rad NS1 Ag memiliki sensitivitas tinggi dan spesifisitas untuk menentukan
infeksi akut DENV-2 dan infeksi campuran. Namun, Bio-Rad NS1 Ag memiliki
sensitivitas yang terbatas, namun spesifisitas tinggi untuk diagnosis infeksi akut
DENV-4.;Non Structural-1 (NS1) protein of dengue virus is proven to be a marker for early
diagnosis of dengue infection. Bio-Rad NS1 Ag Strip is one of the available
diagnostic kit in Indonesia that comprised of NS1. The aim of this study was to
measure the sensitivity and specificity of the kit within DENV-2, DENV-4and
mixed dengue virus serotypes. This study was done in 36 months (March 2010-
February 2013). There were 102 dengue suspected patients with fever less than 48
hours was fulfilling inclusion criteria. Reverse Transcription- Polymerase Chain
Reaction (RT-PCR) or virus isolation in C6/36 cell line or increase titer antibody
by ELISA was used as gold standard. RT-PCR was also used to determine
serotype of the dengue virus. SPSS version 17.0 was the main statistical tool that
we used. Data binominal variables was presented as incidence rates with 95%
confidence intervals. Sensitivity and specificity of diagnostic kit was presented in
2x2 tablesand area under the curve (AUC) of the Receiver Operating
Characteristics Curve. From 102 patients, 68 (68.3%) patients were confirmed
positive dengue infection. Within confirmed dengue infection patients by RT-PCR
we found DENV-1, DENV-2, DENV-3,DENV-4 17 (16.7%), 21 (20.5%), 16
(15.7%), 4 (3.9%), respectively. It was also found some mixed infection cases,
which were (i)DENV-1 and DENV-2, (ii)DENV-1 and DENV-3, (iii)DENV-1
and DENV-4, (iv)DENV-1, DENV-3 and DENV-4, (v)DENV-2 and DENV-4 and
(vi)unknown were of 2 (2.0%), 3 (2.9%), 1 (1.0%), 1 (1.0%), 1 (1.0%) and 2
(2.0%), respectively. The sensitivity and specificity of Bio-Rad NS1 Ag Strip for
DENV-2 sera collected were 76.2% and 100% (95% CI, 76.8% to 99.3%),
respectively. The sensitivity and specificity of Bio-Rad NS1 Ag Strip for DENV-4
were 50% and 100% (95% CI, 50% to 100%), respectively. The sensitivity and
specificity of Bio-Rad NS1 Ag Strip for mixed infection were both 100% (95%
CI, 95% to 100%). Bio-Rad NS1 Ag Strip has high sensitivity and specificity to
determine DENV-2 and mixed infection. On the other hand, Bio-Rad NS1 Ag
Strip has limited sensitivity, but high specificity for diagnosis of DENV-4 acute
infection;Non Structural-1 (NS1) protein of dengue virus is proven to be a marker for early
diagnosis of dengue infection. Bio-Rad NS1 Ag Strip is one of the available
diagnostic kit in Indonesia that comprised of NS1. The aim of this study was to
measure the sensitivity and specificity of the kit within DENV-2, DENV-4and
mixed dengue virus serotypes. This study was done in 36 months (March 2010-
February 2013). There were 102 dengue suspected patients with fever less than 48
hours was fulfilling inclusion criteria. Reverse Transcription- Polymerase Chain
Reaction (RT-PCR) or virus isolation in C6/36 cell line or increase titer antibody
by ELISA was used as gold standard. RT-PCR was also used to determine
serotype of the dengue virus. SPSS version 17.0 was the main statistical tool that
we used. Data binominal variables was presented as incidence rates with 95%
confidence intervals. Sensitivity and specificity of diagnostic kit was presented in
2x2 tablesand area under the curve (AUC) of the Receiver Operating
Characteristics Curve. From 102 patients, 68 (68.3%) patients were confirmed
positive dengue infection. Within confirmed dengue infection patients by RT-PCR
we found DENV-1, DENV-2, DENV-3,DENV-4 17 (16.7%), 21 (20.5%), 16
(15.7%), 4 (3.9%), respectively. It was also found some mixed infection cases,
which were (i)DENV-1 and DENV-2, (ii)DENV-1 and DENV-3, (iii)DENV-1
and DENV-4, (iv)DENV-1, DENV-3 and DENV-4, (v)DENV-2 and DENV-4 and
(vi)unknown were of 2 (2.0%), 3 (2.9%), 1 (1.0%), 1 (1.0%), 1 (1.0%) and 2
(2.0%), respectively. The sensitivity and specificity of Bio-Rad NS1 Ag Strip for
DENV-2 sera collected were 76.2% and 100% (95% CI, 76.8% to 99.3%),
respectively. The sensitivity and specificity of Bio-Rad NS1 Ag Strip for DENV-4
were 50% and 100% (95% CI, 50% to 100%), respectively. The sensitivity and
specificity of Bio-Rad NS1 Ag Strip for mixed infection were both 100% (95%
CI, 95% to 100%). Bio-Rad NS1 Ag Strip has high sensitivity and specificity to
determine DENV-2 and mixed infection. On the other hand, Bio-Rad NS1 Ag
Strip has limited sensitivity, but high specificity for diagnosis of DENV-4 acute
infection
