Browsing Research Articles (Medical Virology) by UP Author "Van Zyl, Walda B."

Browsing Research Articles (Medical Virology) by UP Author "Van Zyl, Walda B."

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  • Absence of Helicobacter pylori within the oral cavities of members of a healthy South African community 
    Olivier, Brenda J.; Bond, Robert P.; Van Zyl, Walda B.; Delport, Maraliese; Slavik, Tomas; Ziady, Christopher; Terhaar sive Droste, Jochim S.; Lastovica, Albert; Van der Merwe, Schalk Willem (American Society for Microbiology, 2006-02)
    Our study aimed to evaluate the oral cavity as a reservoir from where Helicobacter pylori may be transmitted. Histology and PCR amplification were performed. Eighty-four percent of the stomach biopsies tested positive; ...
  • Analytical methods for virus detection in water and food 
    Bosch, Albert; Sanchez, Gloria; Abbaszadegan, Morteza; Carducci, Annalaura; Guix, Susana; Le Guyader, Françoise S.; Netshikweta, Rembuluwani; Pinto, Rosa M.; Van der Poel, Wim H.M.; Rutjes, Saskia; Sano, Daisuke; Taylor, Maureen B.; Van Zyl, Walda B.; Rodriguez-Lazaro, David; Kovac, Katarina; Sellwood, Jane (Springer, 2011-03)
    Potential ways to address the issues that relate to the techniques for analyzing food and environmental samples for the presence of enteric viruses are discussed. It is not the authors’ remit to produce or recommend ...
  • Applicability of Bio-wipes for the collection of human faecal specimens for detection and characterisation of enteric viruses 
    Mans, Janet; Van Zyl, Walda B.; Taylor, Maureen B.; Page, Nicola Anne; Sobsey, M.D.; Barnard, T.G.; Potgieter, Natasha (Wiley, 2014-03)
    OBJECTIVE : To determine whether gastroenteritis viruses and other enteric viruses could be detected in faecal specimens collected with Bio-wipes. METHODS : Faecal specimens, self-collected with Bio-wipes, from 190 ...
  • Application of a competitive internal amplification control for the detection of sapoviruses in wastewater 
    Murray, Tanya Y.; Mans, Janet; Van Zyl, Walda B.; Taylor, Maureen B. (Springer, 2013-01)
    In this study, a competitive internal amplification control (IAC) was constructed for application in the real-time reverse transcription-polymerase chain reaction detection of sapoviruses (SaVs). A SaV RNA standard was ...
  • Detection of potentially pathogenic enteric viruses in environmental samples from Kenya using the bag-mediated filtration system 
    Van Zyl, Walda B.; Zhou, Nicolette A.; Wolfaardt, Marianne; Matsapola, P.N. (Peter); Ngwana, F.B. (Fhatuwani); Symonds, Erin M.; Fagnant-Sperati, Christine S.; Shirai, Jeffry H.; Kossik, Alexandra L.; Beck, Nicola K.; Komen, Evans; Mwangi, Benlick; Nyangao, James; Boyle, David S.; Borus, Peter; Taylor, Maureen B.; Meschke, J. Scott (IWA Publishing, 2019-09)
    Enteric virus environmental surveillance via a highly sensitive method is critical, as many enteric viruses have low infectious doses and can persist in the environment for extended periods. This study determined the ...
  • Diverse norovirus genotypes identified in sewage-polluted river water in South Africa 
    Mans, Janet; Netshikewta, Rembuluwani; Magwalivha, Mpho; Van Zyl, Walda B.; Taylor, Maureen B. (Cambridge University Press, 2012-03-21)
    This study aimed to assess norovirus (NoV) contamination and genotype diversity in surface water in Gauteng, South Africa. Between January 2008 and December 2010, three rivers, namely Klip, Suikerbosrant, and Rietspruit ...
  • Feasibility of the bag-mediated filtration system for environmental surveillance of poliovirus in Kenya 
    Zhou, Nicolette A.; Fagnant-Sperati, Christine S.; Komen, Evans; Mwangi, Benlick; Mukubi, Johnstone; Nyangao, James; Hassan, Joanne; Chepkurui, Agnes; Maina, Caroline; Van Zyl, Walda B.; Matsapola, P.N. (Peter); Wolfaardt, Marianne; Ngwana, F.B. (Fhatuwani); Jeffries-Miles, Stacey; Coulliette-Salmond, Angela; Penaranda, Silvia; Shirai, Jeffry H.; Kossik, Alexandra L.; Beck, Nicola K.; Wilmouth, Robyn; Boyle, David S.; Burns, Cara C.; Taylor, Maureen B.; Borus, Peter; Meschke, John Scott (Springer, 2020-03)
    The bag-mediated filtration system (BMFS) was developed to facilitate poliovirus (PV) environmental surveillance, a supplement to acute flaccid paralysis surveillance in PV eradication efforts. From April to September 2015, ...
  • Hand-foot-and-mouth disease caused by coxsackievirus A6 in a patient infected with HIV 
    Mayaphi, Simnikiwe Horatious; Van Zyl, Walda B.; Sono, Tinah; Loots, Donovan P.; Taylor, Maureen B. (MedPharm Publications, 2015)
    Hand, foot and mouth disease (HFMD) is common in children ≤ 5 years of age, and is mainly caused by enterovirus 71 and coxsackievirus A16 (CVA6). A 12-year-old boy on treatment for human immunodeficiency virus (HIV) ...
  • Molecular epidemiology of group A Rotaviruses in water sources and selected raw vegetables in Southern Africa 
    Van Zyl, Walda B.; Page, Nicola Anne; Grabow, W.O.K.; Steele, Andrew Duncan; Taylor, Maureen B. (American Society for Microbiology, 2006-07)
    Group A rotaviruses (RVs) are the most important cause of acute viral gastroenteritis in infants and young children. In this study raw and treated drinking water supplies at plants in two geographic areas, as well as ...
  • Poliovirus vaccine strains detected in stool specimens of immunodeficient children in South Africa 
    Pavlov, Dobromir Nikolov; Van Zyl, Walda B.; Kruger, Marlena C.; Blignaut, Liezl; Grabow, W.O.K.; Ehlers, Marthie Magdaleen (Elsevier, 2006)
    After exposure to the oral poliovirus vaccine (OPV), immunocompetent persons excrete poliovirus (PV) vaccine strains for a limited period. In contrast, immunodeficient individuals remain sometimes chronically infected, and ...
  • Prevalence of vaccine-derived polioviruses in sewage and river water in South Africa 
    Pavlov, Dobromir Nikolov; Van Zyl, Walda B.; Van Heerden, J.; Grabow, W.O.K.; Ehlers, Marthie Magdaleen (Elsevier, 2005-09)
    Polioviruses (PVs) are not associated with waterborne transmission to the same extent as many other enteric viruses. However, they are typically transmitted by the faecal-oral route, which implies that the risk of infection ...
  • Prevalence of vaccine-derived polioviruses in stools of immunodeficient children in South Africa 
    Pavlov, Dobromir Nikolov; Van Zyl, Walda B.; Van Heerden, J.; Kruger, Marlena C.; Blignaut, Liezl; Grabow, W.O.K.; Ehlers, Marthie Magdaleen (Blackwell, 2006-12)
    Aims: The aim of the study was to determine the prevalence of vaccine-derived polioviruses (VDPVs) in stool specimens of immunodeficient patients such as HIV-positive children (including those with an AIDS indicator ...
  • Rotavirus G and P types circulating in the eastern region of Kenya : predominance of G9 and emergence of G12 genotypes 
    Kiulia, Nicholas M.; Nyaga, Martin M.; Seheri, Mapaseka L.; Wolfaardt, Marianne; Van Zyl, Walda B.; Esona, Mathew D.; Irimu, Grace; Inoti, Murithi; Gatinu, Bernard W.; Njenga, Peter K.; Taylor, Maureen B.; Nyachieo, Atunga (Lippincott, Williams & Wilkins, 2014)
    BACKGROUND: The World Health Organization has recommended that rotavirus (RV) vaccines be included in all national immunization programs as part of a strategy to control RV-associated diarrheal diseases. Hospital-based ...
  • Stem cell transplant in immune-deficiency-associated vaccine-derived poliovirus 
    Ranchod, Heena; Howard, Wayne; Roux, Adele; Van Zyl, Walda B.; Ekermans, Pieter; Van den Berg, Sylvia; Seakamela, Lerato; Makua, Koketso; Yousif, Mukhlid; Sibiya, Rosinah; Du Plessis, Heleen; Phalane, Emmanuel; McCarthy, Kerrigan; Moonsamy, Shelina; Reynders, David; Hincks, Jeffrey; Suchard, Melinda S.; Du Plessis, Nicolette Marie (Oxford University Press, 2024-01)
    Patients with severe primary immunodeficiency are at risk for complications from live-attenuated vaccines. Here, we report a case of a vaccine-associated paralytic polio and Bacille Calmette-Guérin disease in a 6-month-old ...
  • Validation of the bag-mediated filtration system for environmental surveillance of poliovirus in Nairobi, Kenya 
    Fagnant-Sperati, C.S.; Ren, Y.; Zhou, N.A.; Komen, E.; Mwangi, B.; Hassan, J.; Chepkurui, A.; Nzunza, R.; Nyangao, J.; Van Zyl, Walda B.; Wolfaardt, Marianne; Matsapola, P.N. (Peter); Ngwana, F.B. (Fhatuwani); Jeffries-Miles, S.; Coulliette-Salmond, A.; Pe~naranda, S.; Vega, E.; Shirai, J.H.; Kossik, A.L.; Beck, N.K.; Boyle, D.S.; Burns, C.C.; Taylor, M.B.; Borus, P.; Meschke, J.S. (Wiley, 2021-03)
    AIMS : This study compared the bag-mediated filtration system (BMFS) and standard WHO two-phase separation methods for poliovirus (PV) environmental surveillance, examined factors impacting PV detection and monitored ...