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In Nigeria, an enormous gap in knowledge on livestock mobility and its role in transboundary disease spread exists. As animals move, so do diseases. Therefore, there is a need to understand how livestock movements can contribute to the circulation and maintenance of infectious livestock diseases, which can impede the design of particular surveillance and control tactics in the event of outbreaks. Our study aimed to compare and combine market surveys and participatory approaches to map and describe small ruminant mobility in three selected states in northern Nigeria for better surveillance and control of small ruminant infectious diseases. We conducted a market survey via semi-structured questionnaires from 1065 market traders and 20 separate focus group discussions with traders and transhumance in 10 local government areas (LGAs) in the three northern states, namely, Plateau, Bauchi and Kano. The respondent movements by type, animal movement, and reason for movement were described and summarized. The data collected were used to reconstruct small ruminant mobility networks, whose nodes were LGAs, in the 3 states of the survey area and with other states in Nigeria and whose movements were mapped. The characteristics of both networks were studied via a complex network approach either separately or in combination. The use of these two approaches provides a complementary view of small ruminant mobility. The reconstructed networks are connected, highly heterogeneous and have very low density. The networks include LGAs belonging to 31 states. The presence of hubs increases the risk of disease spread. Gwarzo, Wudil (Kano) and Alkaleri (Bauchi) LGAs receive the most sheep and goats, whereas Jos North (Plateau) and Gwarzo supply more small ruminants. The Bukuru and Alkaleri markets are superspreaders with a relatively high probability of detecting virus circulation. Four to six multistate communities were identified. Our findings could support policy choices to identify priority areas for surveillance and disease control in small ruminants.
In Nigeria, an enormous gap in knowledge on livestock mobility and its role in transboundary disease spread exists. As animals move, so do diseases. Therefore, there is a need to understand how livestock movements can contribute to the circulation and maintenance of infectious livestock diseases, which can impede the design of particular surveillance and control tactics in the event of outbreaks. Our study aimed to compare and combine market surveys and participatory approaches to map and describe small ruminant mobility in three selected states in northern Nigeria for better surveillance and control of small ruminant infectious diseases. We conducted a market survey via semi-structured questionnaires from 1065 market traders and 20 separate focus group discussions with traders and transhumance in 10 local government areas (LGAs) in the three northern states, namely, Plateau, Bauchi and Kano. The respondent movements by type, animal movement, and reason for movement were described and summarized. The data collected were used to reconstruct small ruminant mobility networks, whose nodes were LGAs, in the 3 states of the survey area and with other states in Nigeria and whose movements were mapped. The characteristics of both networks were studied via a complex network approach either separately or in combination. The use of these two approaches provides a complementary view of small ruminant mobility. The reconstructed networks are connected, highly heterogeneous and have very low density. The networks include LGAs belonging to 31 states. The presence of hubs increases the risk of disease spread. Gwarzo, Wudil (Kano) and Alkaleri (Bauchi) LGAs receive the most sheep and goats, whereas Jos North (Plateau) and Gwarzo supply more small ruminants. The Bukuru and Alkaleri markets are superspreaders with a relatively high probability of detecting virus circulation. Four to six multistate communities were identified. Our findings could support policy choices to identify priority areas for surveillance and disease control in small ruminants.
Peste des petits ruminants (PPR) is a severe viral disease of small ruminants caused by a Morbillivirus closely related to rinderpest virus. It is widespread in Africa and Asia and is currently also found in Turkey and Northern Africa. PPR is transmitted via direct contact, and the disease would mainly be transferred to infection-free areas by transport of infected animals. In the EU, it could only happen through illegal transport of animals. The risk of that depends on the prevalence in the country of origin and the number of animals illegally moved. The extent of the spread would depend mainly on the time during which it is undetected, the farm density, the frequency and distance of travel of animals. PPR has a high within-herd transmission rate, therefore contacts between flocks, e.g. through common grazing areas, should be avoided when PPR is present. If PPR enters EU areas with dense sheep population but low goat density, it may spread rapidly undetected, since goats are considered more susceptible than sheep. Effective measures in limiting the spread of PPR in the EU include prompt culling of infected herds, rapid detection, movement restriction, and disinfection. Live attenuated vaccines against PPR are available, safe and effective, and have been successfully used to control PPR epidemics, but no method exists for differentiating between infected and vaccinated animals; therefore, the development of one is recommended. Awareness-raising campaigns for farmers and veterinary staff to promote recognition of the disease should be considered. The cooperation of the EU with neighbouring countries should be encouraged to prevent the spread of PPR and other transboundary diseases. In particular, EFSA was asked to (i) characterise the disease and provide an update on the global occurrence of PPR and changes in the distribution during the last 10 years; (ii) map the region of concern and other countries of the Mediterranean Basin and Black Sea, displaying identified, or likely, major live animal trade routes; (iii) evaluate all possible pathways of introduction of PPR into the EU, ranking them on the basis of their level of risk, with a view to enhancing preparedness and prevention; (iv) assess the risk of introduction and speed of propagation of PPR into the EU and neighbouring countries; (v) assess the risk of PPR becoming endemic in animal populations in the EU; (vi) assess the impact PPR would have if it were to enter the EU, considering different scenarios as regards the effectiveness of surveillance and control measures; and (vii) review the feasibility, availability and effectiveness of the main disease prevention and control measures (diagnostic tools, biosecurity measures, restrictions on movement, culling). © EuropeanRegarding disease characterisation, the AHAW Panel reported that PPR is a severe viral disease of small ruminants caused by a Morbillivirus closely related to rinderpest virus. It is widespread in Africa, the Middle East and Southern Asia. It is one of the priority animal diseases wh...
Peste des petits ruminants (PPR) is a major constraint to the productivity of small ruminants in Nigeria. Understanding of the current epidemiological status of PPR is crucial to its effective control. A review of the epidemiology of PPR in Nigeria was performed and research gaps were identified. Thirty-seven eligible articles were reviewed: these presented information from 30 of the 36 states of Nigeria. Most studies focused on goats and/or sheep (n= 33) but camels (n= 4), cattle (n= 1) and wild ruminants (n= 2) were also considered. Fourteen (37.8%) of the articles reported seroprevalence in small ruminants, which varied from 0.0% to 77.5% where more than 10 animals were sampled. Molecular characterization and phylogenetic analysis were performed in 6 studies, with lineages II and IV, detected in sheep and goats. In one study in small ruminants, sequences clustering into lineage I showed a similarity to the vaccine strain, Nigeria 75/1, based on phylogenetic analysis ofFgene sequences. However, if the preferred method of sequencing theNgene had been performed, this isolate would have been grouped into lineage II. According toNgene phylogenetic analysis in the other studies, sequences were identified that clustered with clade II-NigA, II-NigB (closely related to the Nigeria 75/1 vaccine strain), and others which were well separated, suggesting a high diversity of PPRV in Nigeria. Five articles reported the detection of lineage IV in 22/36 states, with IV-NigA and IV-NigB detected, highlighting its widespread distribution in Nigeria. Risk factors for PPRV seropositivity were reported in 10/37 (27.0%) articles, with a higher seroprevalence observed in female animals, although differing results were observed when considering species and age separately. There were inconsistencies in study design and data reporting between studies which precluded conduct of a meta-analysis. Nevertheless, several research gaps were identified including the need to investigate the low uptake of PPRV vaccine, and the economic benefits of PPR control measures to small ruminant farmers. Such data will inform PPR control strategies in Nigeria and subsequently contribute to the global 2030 PPR eradication strategy.
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