Besides, five recent strains include 4 strains (one B5, one C2 and two C4) isolated in 2011 and 2012 and one C2-like virus (C2L-101-08) which was isolated in 2008 and identified as an antigenic variant using post-infection sera obtained from children in a previous study (Table 2) (Figure 1) . Twenty-four hours after transfection, single colonies were selected by flow cytometry and seeded in 96-well plates. An antibody titre of 20 was the limit of detection using this method. In the future, a seroepidemiological study should be undertaken to understand the epidemiology of HPeV4 infection in Japan. Table 1. Laboratory methods for measuring EV71 serum neutralizing antibody titers followed standard protocols. Children with a new onset of at least one of the following were included: maculopapular or vesicular rash on the palms and/or soles; vesicles or ulcers in the mouth or herpangina.
Galectin-1 is a galactose-specific binding lectin in mammalian cells. Enteroviruses isolated were typed by nucleotide sequencing of the VP1 or the VP4 genes (2, 13). RT was done in a reaction volume of 20 μl containing 1× RT buffer, 1 mM deoxynucleoside triphosphates, 10 mM dithiothreitol, 1× random hexamer, 50 U of Moloney murine leukemia virus reverse transcriptase (Roche Diagnostics GmbH, Mannheim, Germany), 40 U of human placental RNase inhibitor (Promega, Madison, Wis.), and 5 μl of RNA template. Animals found dead (n = 7) overnight were dissected to determine the cause of death but the tissues were not included in the analysis. The seasonal pattern was observed each year in many diseases. The incongruent phylogenetic relationships observed between the complete genome and VP1 sequences suggest that possible recombination events had occurred in the seven EV71 and SHZH98 strains. Therefore, we used macaques (non-human primate) as a model to evaluate the safety and long-term (over one year) immunogenicity of a formalin-inactivated EV71 whole-virion vaccine candidate (EV71vac) in this study.
Only entries reporting nt sequences with fully specified sampling dates and countries of origin were used, and those reporting sequences lower than 750 nt were discarded to conserve complete or near-complete gene sequences. Tissue suspensions were then obtained by centrifugation at 1000 g for 5 min. The purpose of this study was to investigate the infection spectrum of EV71 and CoxA16, the dynamic change of serum antibodies in the infants, and the incidence of HFMD. At 16 h postinfection (p.i.), the supernatant and debris were collected together and the total virus yield was quantified by a plaque assay. The genome of a bacterium is also made of DNA but has less than 10 million bases. In the second study, 21-day-old gerbils were inoculated with 1×103.5 or 1×105.5 TCID50 of EV71 via the IP route (n = 8 for each dose group). In cells transfected with the pR5SP70A3egf, no evidence of virus growth was seen even at 14 days post-transfection.
The annual average temperature is 14∼14.3°C, the average annual precipitation is 640.9 mm, and the total sunshine is 2400 hours. To analyze the genetic characteristics of EV71 cases, the VP1 gene from EV71 isolates was examined by conventional RT-PCR. This new clade was tentatively called “genogroup F”. EV71 (TW/2231/98) was propagated in RD cells. The N5079 strain (CVA16 virus clinical isolate) was obtained from the National Cheng-Kung University (Tainan, Taiwan). Until now, to the best of our knowledge, EV71 virulence factors and adaptation have not been studied directly from clinical samples during natural human infections and it remains unknown whether secondary seeding from the primary site is only a fortuitous event or if it is associated with specific viral genomic adaptation within the human host. Serum EV71-NtAb can be quantitatively determined by the traditional CPE based neutralization test.
It was hypothesized that a decreasing TFR resulted in a reduced hazard of contracting the agent for KD, thereby increasing KD incidence. Enterovirus 71 (EV71), a positive-stranded RNA virus of the Picornaviridae family, poses a persistent global health problem. The emergence of HFMD as a clinical syndrome which can be associated with severe neurological complications, has emphasized the need to distinguish HEV71 from other enteroviruses causing HFMD. Fifty one patients were excluded due to unavailability of data or lack of consent. RESULTS: Among 172 patients who were enrolled, 16 serotypes were identified. It should not necessarily be regarded as a contaminant when the isolate comes from areas other than the oropharynx, especially from the blood. Here, using a genome-wide knockout approach, we identified several genes in sialic acid (Sia) biology as being essential for infection.
RESULTS: A total of 117 strains were isolated from 111 hospitalized children. Real-time reverse transcriptase (rRT) PCR for influenza was performed on combined nasal and throat specimens followed by viral culture, antigenic analysis, antiviral susceptibility testing and full genome sequencing for phylogenetic analysis. However, the numbers of affected patients are not provided. BACKGROUND: Enterovirus 71 (EV71) causes frequent outbreaks worldwide, particularly in the Asia-Pacific area.