Vaccine Development
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Free Vaccine Development Articles |
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- Southern Research Institute Names Vladimir Yamshchikov Director of Infectious Disease Research Department in Birmingham
- Investigators at Center for Preventive Medicine have published new data on influenza vaccines
- Research on Escherichia coli discussed by B.T.T. Ken and co-researchers
- Research on life sciences reported by D.B.A. Medeiros et al
- Findings from University of Illinois, Medical Department advance knowledge in allergies
- Study findings from X.N. Dong et al provide new insights into vaccine
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Study results from Veterans Affairs Medical Center broaden understanding of influenza vaccines
2007 NOV 6 -- A report, 'Capsule gene analysis of invasive Haemophilus influenzae: accuracy of serotyping and prevalence of IS1016 among nontypeable isolates,' is newly published data in Journal of Clinical Microbiology. According to recent research published in the Journal of Clinical Microbiology, "We evaluated the accuracy of serologic capsule typing by analyzing capsule genes and related markers among invasive Haemophilus influenzae isolates before and after the introduction of H. influenzae serotype b (Hib) conjugate vaccines. Three hundred and sixty invasive H. influenzae isolates were collected as part of Active Bacterial Core surveillance within the Georgia Emerging Infections Program between 1 January 1989 and 31 July 1998." "All isolates were biotyped, serotyped by slide agglutination serotyping (SAST), and evaluated using PCR capsule typing. Nontypeable H. influenzae (NTHi) isolates were probed with Hib cap-gene-containing plasmid pUO38 and with IS1016; a subset was examined with phosphoglucose isomerase (pgi) genotyping and pulsed-field gel electrophoresis (PFGE). Discrepancies between SAST and PCR capsule typing were found for 64/360 (17.5%) of the isolates; 48 encapsulated by SAST were NTHi by PCR, 8 NTHi by SAST were encapsulated by PCR, 6 encapsulated by SAST were a different capsule type by PCR, and 2 encapsulated by SAST were capsule-deficient Hib variants (Hib-minus). None of the PCR-confirmed NTHi isolates demonstrated homology with residual capsule gene sequences; 19/201 (9.5%) had evidence of IS1016, an insertion element associated with division I H. influenzae capsule serotypes. The majority of IS1016-positive NTHi were biotypes I and V and showed some genetic relatedness by PFGE," wrote S.W. Satola and colleagues, Veterans Affairs Medical Center. The researchers concluded: "PCR capsule typing was more accurate than SAST and Hib-minus variants were rare. IS1016 was present in 9.5% of NTHi isolates, suggesting that this subset may be more closely related to encapsulated organisms. A better understanding of NTHi may contribute to vaccine development." Satola and colleagues published their study in the Journal of Clinical Microbiology (Capsule gene analysis of invasive Haemophilus influenzae: accuracy of serotyping and prevalence of IS1016 among nontypeable isolates. Journal of Clinical Microbiology, 2007;45(10):3230-8). For additional information, contact S.W. Satola, Atlanta Veterans Affairs Medical Center, Medical Research Service 151, 1670 Clairmont Rd., Decatur, GA 30033 USA.. The publisher's contact information for the Journal of Clinical Microbiology is: American Society Microbiology, 1752 N St. NW, Washington, DC 20036-2904, USA. Keywords: United States, Decatur, Influenza Vaccines, Biotechnology, Clinical Microbiology, Diagnosis, Diagnostics, Flu, Haemophilus, Influenza, Vaccines. This article was prepared by Life Science Weekly editors from staff and other reports. Copyright 2007, Life Science Weekly via NewsRx.com.
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