Uganda National Council for Science and Technology

ABSTRACTVaccine failures after Newcastle disease vaccination with the current commercial vaccines have been reported and are associated with many factors, including genotypic and antigenic differences between vaccine and outbreak strains, although all APMV-1 members belong to one serotype. We assessed the immunoprotection ability of four thermostable, low-virulent Newcastle disease-virus isolates from Ugandan waterfowl against challenge with a virulent strain (MDT = 36.8 h, ICPI = 1.78) isolated from morbid chicken. Six-week-old commercial Leghorn layers, challenged at 21 days post immunization were used. Four isolates designated: NDV-133/UG/MU/2011, NDV-177/UG/MU/2011, NDV-178/UG/MU/2011 and NDV-173/UG/MU/2011 induced mean haemagglutinin inhibition antibody titres of log2 9.3, 8.2, 6.3 and 2.0, respectively, at 21 days post immunization. The antibody titres correlated with the protection rates (R² = 0.86, p < 0.007) of 60%, 50%, 20% and 0% of birds, respectively, against challenge at 14 days post challenge. Further evaluation of these and more low-virulent isolates might provide an alternative to the current commercial vaccine failures.

The chapter discusses the policy options that sub-Saharan African (SSA) countries must embrace in order to benefit from a first demographic dividend (DD). First, SSA governments and their development partners must appreciate that a rapid fertility decline is needed to open the demographic window of opportunity that will permit eventually to capture the benefits of a first DD. In addition, SSA governments will need to assess the various policy options that will facilitate the capturing of a first DD. These policy options exist in social sectors (education and health), in economic sectors (infrastructure, transport, and telecommunicatio nstelecommunications), and in the area of good governance. Thereafter and in order to implement the needed policies, the chapter stresses the importance of governmental strategic partnerships with both the private sector as well as the international community (aid agencies and NGOs). The DD is not automatic and without timely, proactive, and enduring policies in the priority sectors, a first DD might not be captured at all.

BackgroundUganda poultry production is still faced with frequent outbreaks of Newcastle disease (ND) in the backyard free-range systems despite the accessibility of cross protective vaccines. Live bird markets and waterfowl has long been reported as a major source of disease spread as well as potential sources of avirulent strains that may mutate to virulent strains. ND-virus has been reported enzootic in Ugandan poultry but limited studies have been conducted to ascertain thermostability phenotypes of the Ugandan ND-virus strains and to understand how these relate to vaccine strains.MethodsThis study evaluated thermostability of 168 ND-virus field isolates recovered from live bird markets and waterfowls in Uganda compared to two live commercial vaccine strains (I2 and LaSota) by standard thermostability procedures and Hemagglutinin-Neuraminidase (HN) gene domains. The known pathotypes with thermostability profiles were compared at HN amino acid sequences.ResultsField isolates displayed disparate heat stability and HN gene domains. Thermolabile isolates were inactivated within 15 min, while the most thermostable isolates were inactivated in 120 min. Four thermostable isolates had more than 2 log2 heamaglutinin (HA) titers during heat treatment and the infectivity of 9.8 geometric mean of log10 EID50 % in embryonated eggs. One isolate from this study exhibited a comparable thermostability and stable infectivity titers after serial passages, to that of reference commercial vaccine was recommended for immunogenicity and protection studies.ConclusionThe occurrence of ND-virus strains in waterfowl and live bird markets with disparate thermostability and varying HN gene domains indicate circulation of different thermostable and thermolabile ND-virus pathotypes in the country.

Paying research participants in developing countries like Uganda raises ethical concerns over potential for undue inducement. This article, based on an exploratory study, reviewed 49 research protocols from a national HIV/AIDS research ethics committee database. Payments mainly adhered to the reimbursement and compensation payment models. Offers made were diverse but basic in order to limit undue inducement. Implications in terms of undue inducement and possible impact on participants and research are discussed. We end by recommending standardization across comparable studies in the interests of promoting high-quality research, altruism, voluntariness, and restraining unfair reimbursement practices in research.