title: Simplified dengue virus microwell plaque assay using an automated quantification program.
abstract: The plaque assay is essential for virion quantitation but the classic protocol requires considerable efforts. A simplified dengue 96-well plaque assay with automated quantitation program is an alternative to access the level of infectious virus. Dengue plaque assay was simplified using LLC/MK2 cells and virus mixing simultaneously before semisolid addition. Results were obtained using a flatbed scanner and analysis by the self-written program optimized to manual reads. The newly developed microwell system was accurate to the standard assay because 19 independent titrations from all subtypes obtained from both systems differed less than a log10 p.f.u./ml with no significance (p>0.05) with good correlation (R2=0.9058). Coefficient of variations within and between assays, indicating assay reliability and repeatability, were 19.29%, and 12.50%, respectively. This method serves various experimental designs in drug discovery that requires viral titers assessment. Effective concentrations (EC90) results showed no significant difference between 24- and 96-well assays (p>0.05). Compound screening for potential antivirals and clinical isolate titrations were successfully arranged. The method contains distinguished features including protocol simplicity, less reagent consumption in microwell format, convenient and affordable data acquisition and analysis system.
authors.affiliation: Department of Microbiology, Chulalongkorn University 1873 Rama 4 Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: siwaporn.b@chula.ac.th.
authors.forename: Siwaporn
authors.initials: S
authors.lastname: Boonyasuppayakorn
authors.affiliation: Medical Science Program, Faculty of Medicine, Chulalongkorn University, 1873 Rama 4 Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: aphinya.mtpon@gmail.com.
authors.forename: Aphinya
authors.initials: A
authors.lastname: Suroengrit
authors.affiliation: Department of Biology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: psrivarangkul@gmail.com.
authors.forename: Pimsiri
authors.initials: P
authors.lastname: Srivarangkul
authors.affiliation: Department of Biology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: golf.wanchalerm@gmail.com.
authors.forename: Wanchalerm
authors.initials: W
authors.lastname: Yuttithamnon
authors.affiliation: Department of Biology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: pankaewf@gmail.com.
authors.forename: Saran
authors.initials: S
authors.lastname: Pankaew
authors.affiliation: Department of Biology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: thanaphon.saelee@gmail.com.
authors.forename: Thanaphon
authors.initials: T
authors.lastname: Saelee
authors.affiliation: Chula Vaccine Research Center (Chula VRC), Faculty of Medicine, Chulalongkorn University, 1873 Rama 4 Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: prompetchara@gmail.com.
authors.forename: Eakachai
authors.initials: E
authors.lastname: Prompetchara
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: saran.s@chula.ac.th.
authors.forename: Saran
authors.initials: S
authors.lastname: Salakij
authors.affiliation: Department of Microbiology, Chulalongkorn University 1873 Rama 4 Road, Pathumwan, Bangkok, 10330, Thailand. Electronic address: parvapan.b@chula.ac.th.
authors.forename: Parvapan
authors.initials: P
authors.lastname: Bhattarakosol
mesh_terms: D057205:Automation, Laboratory / Q000379:methods*; D002460:Cell Line; D000068598:Data Accuracy; D003715:Dengue / Q000175:diagnosis* / Q000821:virology; D003716:Dengue Virus / Q000302:isolation & purification* / Q000502:physiology; D006801:Humans; D010948:Viral Plaque Assay / Q000295:instrumentation / Q000379:methods*