The question of the early diagnosis of asymptomatic and subpatent malaria in pregnancy: Implications for diagnostic tools in a malaria endemic area.

Objectives: Malaria in pregnancy (MIP) is a major healthcare challenge in low-income countries with high malaria endemicity. Early but accurate diagnosis and appropriate treatment is the hallmark of preventing disease progression/adverse outcomes in the mother, foetus and neonates. We assessed the comparative diagnostic performance of Malaria Rapid Diagnostic Test (mRDT), microscopy and PCR for malaria diagnosis in pregnant women for early detection of asymptomatic malaria in pregnant women. Study design: Five hundred and twenty Pregnant women attending study clinics within Ikene and Remo North LGAs with gestational age between 16 and 29 weeks, willing and consented; were enrolled into the study. Blood samples collected via venepuncture were screened for malaria using microscopy, mRDTs kits, and PCR techniques on their first visit (V1) and at delivery. The parasite positivity rates, sensitivity and specificity were calculated and compared for each technique using PCR as the standard. Data was entered into REDCap® online database and analysis done using Stata and MedCalc®. Results and conclusions: Average age of enrolled women was 28.8 years and mean gestational age was 21.0 weeks. The parasite positivity rates were 4.3%, 8.8% and 25.0% for microscopy, mRDT and PCR at V1 and was 2.4%, 3.4% and 43.4% at delivery, respectively. Sensitivity for microscopy and mRDT was 11.2% and 30.3% respectively at V1, while specificity was 98.2% and 98.5%. At delivery, the sensitivity reduced to 1.6% and 4.9%; while specificity was 96.9% and 97.6% respectively. Only 2.3% cases correlated with all three diagnostic methods. Our data showed a decrease in sensitivity of the diagnostic methods as pregnancy progressed, which may be due to very low parasitaemia, but high specificity. Our study demonstrated a high rate of subpatent parasitaemia amongst pregnant women. This finding therefore raises the question of the effect of subpatent parasitaemia on the health of the mother and foetus.

MRI TRAINING IN AFRICA.

Introduction: This article presents an overview of MRI training in Africa, emphasizing its current status and the obstacles it encounters, with a report from a recent MRI workshop held in Uganda in September 2022. Africa's medical imaging sector faces unique challenges due to limited access to advanced technology, skilled professionals, and educational resources. While some regions have made notable strides in establishing MRI training programs, others struggle with a shortage of qualified MRI technicians and radiologists. These disparities underscore the urgent need for a more equitable distribution of resources and expertise across the continent. The aim of the MRI workshop was to initiate actions to address these challenges. This workshop leveraged the expertise of MRI clinicians and scientists to devise strategies for enhancing MRI training in Africa. The report outlines the key outcomes, recommendations, and initiatives resulting from this collaborative endeavor. Conclusion: This report offers a crucial overview of MRI training in Africa, highlighting its challenges and disparities. It emphasizes the necessity of coordinated efforts to improve MRI education, ultimately contributing to enhanced healthcare outcomes for Africa's population.

Challenges of caregivers and needs of children with parents in a Nigerian prison.

Background: Separation of a parent from the family as a result of incarceration has both short-term and long-term effects on the family, even after release from prison. This study is a report of factors and challenges of the family left to adapt to the changed circumstances of separation from parent(s) who are incarcerated. Methods: This was a cross sectional study carried out on 89 caregivers of children whose parents are incarcerated at the Agodi prison, Ibadan who gave informed and written consent to interview their families. Results: Most caregivers had little or no formal education (69.7%) and 67.4% are into petty trading or subsistence farming. A majority of the caregivers reported the need of schooling (85.4%), provision of food (84.3%) and medical care (71.9%) as major challenges, only 25% received any form of support to meet these needs. Twenty-nine (32.6%) respondents reported receiving financial support to provide for the child's feeding. Some caregivers 21 (23.6%), obtained loans to cope with the financial needs of the children while only 3 (3.4%) received support from family or other non-governmental organisations. Conclusion: The caregivers of children of prison inmates face significant challenges in meeting the needs of feeding, health and schooling. Support structures and policies to address these gaps are required.

Co-existing sickle cell anaemia and inflammatory bowel disease: case report and review of the literature.

Sickle cell anaemia (SCA) is a chronic haemolytic anaemia associated with vaso-occlusive painful crises which may affect several systems including the gastro-intestinal system, resulting in abdominal pain. The concurrence of inflammatory bowel disease and haemoglobinopathy is rare. No previously reported concurrent cases of both SCA and ulcerative colitis (UC) in sub-Saharan Africa were found in the literature. A 16-year-old girl with concurrent SCA and UC is presented. She was admitted to University College Hospital, Ibadan with a 1-year history of recurrent peri-umbilical pain and bloody stools. These symptoms were mainly attributed to SCA at the referring hospital, and she was managed for chronic tropical diarrhoea without a remarkable clinical response. This case illustrates the concurrent presentation of SCA and ulcerative colitis which led to the missed and delayed diagnosis of ulcerative colitis.

Investigating quantum metrology in noisy channels.

Quantum entanglement lies at the heart of quantum information and quantum metrology. In quantum metrology, with a colossal amount of quantum Fisher information (QFI), entangled systems can be ameliorated to be a better resource scheme. However, noisy channels affect the QFI substantially. This research work seeks to investigate how QFI of N-qubit Greenberger-Horne-Zeilinger (GHZ) state is affected when subjected to decoherence channels: bit-phase flip (BPF) and generalize amplitude damping (GAD) channels, which can be induced experimentally. We determine the evolution under these channels, deduce the eigenvalues, and then derive the QFI. We found that when there is no interaction with the environment, the Heisenberg limit can be achieved via rotations along the z direction. It has been shown that in BPF channel, the maximal mean QFI of the N-qubit GHZ state ([Formula: see text]) dwindles as decoherence rate (p B ) increases due to flow of information from the system to the environment, until p B = 0.5, then revives to form a symmetric around p B = 0.5. Thus, p B > 0.5 leads to a situation where more noise yields more efficiency. We found that in GAD channel, at finite temperature, QFIs decay more rapidly than at zero temperature. Our results also reveal that QFI can be enhanced by adjusting the temperature of the environment.

Human resource constraints and the prospect of task-sharing among community health workers for the detection of early signs of pre-eclampsia in Ogun State, Nigeria.

BACKGROUND: The dearth of health personnel in low income countries has attracted global attention. Ways as to how health care services can be delivered in a more efficient and effective way using available health personnel are being explored. Task-sharing expands the responsibilities of low-cadre health workers and allows them to share these responsibilities with highly qualified health care providers in an effort to best utilize available human resources. This is appropriate in a country like Nigeria where there is a shortage of qualified health professionals and a huge burden of maternal mortality resulting from obstetric complications like pre-eclampsia. This study examines the prospect for task-sharing among Community Health Extension Workers (CHEW) for the detection of early signs of pre-eclampsia, in Ogun State, Nigeria. METHODS: This study is part of a larger community-based trial evaluating the acceptability of community treatment for severe pre-eclampsia in Ogun State, Nigeria. Data was collected between 2011 and 2012 using focus group discussions; seven with CHEWs (n = 71), three with male decision-makers (n = 35), six with community leaders (n = 68), and one with member of the Society of Obstetricians and Gynaecologists of Nigeria (n = 9). In addition, interviews were conducted with the heads of the local government administration (n = 4), directors of planning (n = 4), medical officers (n = 4), and Chief Nursing Officers (n = 4). Qualitative data were analysed using NVivo version 10.0 3 computer software. RESULTS: The non-availability of health personnel is a major challenge, and has resulted in a high proportion of facility-based care performed by CHEWs. As a result, CHEWs often take on roles that are designated for senior health workers. This role expansion has exposed CHEWs to the basics of obstetric care, and has resulted in informal task-sharing among the health workers. The knowledge and ability of CHEWs to perform basic clinical assessments, such as measure blood pressure is not in doubt. Nevertheless, there were divergent views by senior and junior cadres of health practitioners about CHEWs' abilities in providing obstetric care. Similarly, there were concerns by various stakeholders, particularly the CHEWs themselves, on the regulatory restrictions placed on them by the Standing Order. CONCLUSION: Generally, the extent to which obstetric tasks could be shifted to community health workers will be determined by the training provided and the extent to which the observed barriers are addressed. TRIAL REGISTRATION: NCT01911494.

Determinants of health care seeking behaviour during pregnancy in Ogun State, Nigeria.

BACKGROUND: In Nigeria, women too often suffer the consequences of serious obstetric complications that may lead to death. Delay in seeking care (phase I delay) is a recognized contributor to adverse pregnancy outcomes. This qualitative study aimed to describe the health care seeking practices in pregnancy, as well as the socio-cultural factors that influence these actions. METHODS: The study was conducted in Ogun State, in south-western Nigeria. Data were collected through focus group discussions with pregnant women, recently pregnant mothers, male decision-makers, opinion leaders, traditional birth attendants, health workers, and health administrators. A thematic analysis approach was used with QSR NVivo version 10. RESULTS: Findings show that women utilized multiple care givers during pregnancy, with a preference for traditional providers. There was a strong sense of trust in traditional medicine, particularly that provided by traditional birth attendants who are long-term residents in the community. The patriarchal c influenced health-seeking behaviour in pregnancy. Economic factors contributed to the delay in access to appropriate services. There was a consistent concern regarding the cost barrier in accessing health services. The challenges of accessing services were well recognised and these were greater when referral was to a higher level of care which in most cases attracted unaffordable costs. CONCLUSION: While the high cost of care is a deterrent to health seeking behaviour, the cost of death of a woman or a child to the family and community is immeasurable. The use of innovative mechanisms for health care financing may be beneficial for women in these communities to reduce the barrier of high cost services. To reduce maternal deaths all stakeholders must be engaged in the process including policy makers, opinion leaders, health care consumers and providers. Underlying socio-cultural factors, such as structure of patriarchy, must also be addressed to sustainably improve maternal health. TRIAL REGISTRATION: NCT01911494.

Mid-facial fractures: a 5-year retrospective review in a Nigerian teaching hospital.

OBJECTIVE: The aim of this study is to establish the pattern and actiology of mid-facial fractures, of patients seen and treated at the Lagos University Teaching Hospital, Lagos, Nigeria over a 5-year period. MATERIALS AND METHODS: All cases of midfacial fractures diagnosed and treated at the Department of Oral and Maxillofacial Surgery, Lagos University Teaching Hospital (LUTH), Lagos between January 2004 and December 2008 were reviewed. Data collected from case records of patients included age, sex, aetiology of fracture, anatomic site of fracture, associated maxillofacial fracture, types of treatment and postoperative complications. RESULTS: The leading cause of mid-facial fractures was road traffic crashes (RTC) which occurred in 93% of highest incidence of mid-facial fractures (36.5%) occurred in the age group of 21-30 years and the lowest in the age group of 60 years and above (2.6%); with male preponderance in nearly all age groups. Female patients were significantly younger than their male counterparts (P=0.000). The most common site of mid-facial bone fractures was the zygomatic complex (n=89, 44.5%), followed by dento-alveolar (n=26, 13%), and Le fort II (n=23, 12%). Conservative management of the fractures was employed in 2.6% (n=4) of the cases while 97.4% (n=152) of the patients required surgical, intervention CONCLUSIONS: Mid-facial fractures were most common in the 3rd decade of life; with a male-to-female ratio of 3.7: 1. Over 93% of the cases were due to road traffic crashes. Zygomatic complex was the most commonly fractured site. The fact that road traffic crashes still remain the major cause of mid-facial fracture in the studied environment is an indication that the enforcement of legislation to prevent road traffic crashes needs to be re-emphasised.

Orofacial and dental injuries associated with seizures in paediatric patients in Lagos University Teaching Hospital.

OBJECTIVE: To determine the prevalence and pattern of presentation of orofacial and dental injuries in children with seizures at the Children's Emergency Unit of the Lagos University Teaching Hospital (LUTH), Lagos, Nigeria. METHODS: This was a prospective study of children with febrile or non-febrile convulsion who presented at the Children's Emergency Unit of LUTH between July 2008 and August 2009. The age, gender, type of convulsion and the presence/absence of orofacial and other bodily injuries were recorded in a proforma. Mechanism, type and classification of injury were recorded for patients with orofacial injuries. RESULTS: A total of 257 children (148 males and 109 females) with febrile/non-febrile convulsion were included in the analysis. The mean age (SD) of patients was 32.8 ± 40.5 months. There were 223 (86.8%) cases of febrile convulsion and 34 (13.3%) cases of non-febrile convulsion. Thirteen children sustained orofacial injuries giving a prevalence of 5.1%. There was no significant difference in the prevalence of orofacial injury between patients with febrile convulsion (4.5%) and those with non-febrile convulsion (8.8%) (P=0.282). The most common cause of orofacial injuries was forceful insertion of hard object into the mouth during convulsive episodes. Twelve (92.3%) patients sustained soft tissue injury, while one sustained both soft and hard tissue injuries. The most common site of injury was the lip. CONCLUSIONS: Oro-facial and dental injuries may occur in children with seizures. It is therefore important that these injuries be looked for by the paediatrician and the dentist/oral and maxillofacial surgeons should be involved in managing these children.

Grouping of tropical mid-altitude maize inbred lines on the basis of yield data and molecular markers.

The classification of maize inbred lines into heterotic groups is an important undertaking in hybrid breeding. The objectives of our research were to: (1) separate selected tropical mid-altitude maize inbred lines into heterotic groups based on grain yield data; (2) assess the genetic relationships among these inbred lines using amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers; (3) examine the consistency between yield-based and marker-based groupings of the inbred lines. Thirty-eight tropical mid-altitude maize inbred lines were crossed to two inbred line testers representing the flint and dent heterotic pattern, respectively. The resulting testcrosses were evaluated in a trial at three locations for 2 years. Significant general combining ability (GCA) and specific combining ability (SCA) effects for grain yield were detected among the inbred lines. The tester inbred lines classified 23 of the 38 tested inbred lines into two heterotic groups based on SCA effects and testcross mean grain yields. This grouping was not related to endosperm type of the inbred lines. The outstanding performance of testcrosses of the remaining 15 inbred lines indicates the presence of significant genetic diversity that may allow the assignment of the lines into more than two heterotic groups. Diversity analysis of the 40 maize inbred lines using AFLP and SSR markers found high levels of genetic diversity among these lines and subdivided them into two main groups with subdivision into sub-groups consistent with breeding history, origin and parentage of the lines. However, heterotic groups formed using yield-based combining ability were different from the groups established on the basis of molecular markers. Considering the diversity of the genetic backgrounds of the mid-altitude inbred lines, the marker-based grouping may serve as the basis to design and carry out combining ability studies in the field to establish clearly defined heterotic groups with a greater genetic similarity within groups.

Experimental analysis of gossypol and chloroquine interaction in serum and in liver of rat.

Interactive effects of gossypol and chloroquine as determined by activities of serum alanine transaminase (ALT), aspartate transaminase (AST) and liver lactate dehydrogenase (LDH), alkaline phosphatase (ALK-pase), glucose-6-phosphatase (G-6-pase) and cholesterol level were investigated in rats. Administration of gossypol for eight weeks, at a concentration of 20 mg per kg body wt. per day with or without chloroquine had no effect on the serum enzymes and glucose-6-phosphatase activities. When chloroquine at a concentration of 5 mg per kg body wt. thrice a week was administered alone, there was a marked decrease in total protein content and ALK-pose activities, while a significant increase in LDH activity was observed. Administration of either gossypol or chloroquine decreased the level of cholesterol. A greater decrease was recorded when both were given together. It is suggested that gossypol can be employed as a male contraceptive among malaria-infected populations.

Cowpea embryo rescue. 1. Influence of culture media composition on plant recovery from isolated immature embryos.

Factors responsible for successful rescue of immature embryos of cowpea [Vigna unguiculata (L.) Walp.] and V. vexillata (L.) and for in vitro embryo development were studied. A new basal medium for embryo development in vitro was formulated on the basis of the mineral composition of embryos. Sucrose, fructose and glucose were compared as carbohydrate sources. The highest frequency of embryos developing into plants was obtained with sucrose. Adding casein hydrolysate to the medium increased plant recovery by 30%. Among the plant growth factors used, cytokinins, zeatin, 6-benzylaminopurine and kinetin were the most effective in promoting embryo maturation and development. A method that can routinely ensure high plant recovery from cultured immature cowpea embryos is proposed.

The relevance of research on emigration dynamics for policy makers in Sub-Saharan Africa.

PIP: This paper provides an overview of research findings from Phase I for sub-Saharan Africa. Africa varies widely in population size, economic growth and structure, ecology, political systems, religion, and culture. There has been extensive migration and population displacement due to population pressure, poverty, poor economic performances, ethnic conflicts, and abuse of human rights. Economic factors have exacerbated conditions. John Oucho emphasized a need for subregional approaches to refugee flows in the northern parts of eastern Africa, labor migration and refugee flow in the southern parts of eastern Africa, and skilled labor migration from the north to the south and southern Africa. Ethnic composition differs throughout eastern Africa, and population pressure and severe climate changes are challenges to survival strategies. Dominic Milazi focused on labor migration in southern Africa. Sally Findley presented a paper on the population shifts from nine Sahel countries in the interior to coastal areas due to severe climate changes and low agricultural productivity. According to the policy discussion, there is a need to "harmonize" regional and subregional treaties and practices with national laws and administrative practice.^ieng

Emigration dynamics in Sub-Saharan Africa.

PIP: The introduction to this description of emigration dynamics in sub-Saharan Africa notes that the region is characterized by intensive migration caused by such factors as population growth, negative economic growth, ethnic conflict, and human rights abuses. The second section of the report discusses the fragmentary and incomplete nature of data on international migration in the region, especially data on conventional migration. Section 3 looks at demographic factors such as high population growth, illiteracy levels, HIV seroprevalence, and urbanization which lead to high unemployment and emigration. The fourth section considers the effects of the rapid expansion of education which is outstripping the absorptive capacity of the economies of many countries. Unemployment is a serious problem which is projected to become worse as increases in employment opportunities continue to lag behind increases in output. Sections five, six, and seven of the report describe relevant economic factors such as per capita income, income distribution, the economic resource base, and economic development; poverty; and the effects of economic adjustment programs, especially on employment opportunities and wages in the public and private sectors. The next section is devoted to sociocultural factors influencing migration both on the micro- and the macro-levels, including the influence of ethnicity and ethnic conflicts as well as the domination of leadership positions by members of minority groups. The political factors discussed in section 9 include women's status, repressive regimes, political instability which leads to underdevelopment, and the policies of the Organization of African Unity which broadened the definition of refugees and set inviolable borders of member states identical to those inherited upon independence. Section 10 outlines ecological factors contributing to migration, including the decline in acreage of arable land, soil deterioration, poor land management, and the effects of draught. The interaction of all of these factors has contributed to refugee flows of acute magnitude and complexity. The next major section of the report describes the migration situation in each subregion (Western Africa, Nigeria and Ghana, the Sahel, Mail, Eastern Africa, Southern Africa, and Lesotho). The report concludes that migration in response to socioeconomic conditions will continue until conditions improve in the countries of origin.^ieng

Adjustment, social sectors, and demographic change in Sub-Saharan Africa.

PIP: This discussion concludes that the economic crises of the 1980s resulted in a halt to the social and economic development of sub-Saharan Africa. Employment, health, and education sectors all deteriorated under structural adjustment programs (SAPs) and poor economic performance. SAPs are considered inadequate solutions to long-term problems. Economic crises were found to affect countries differently in their demographic impact. Delayed demographic transition occurred both through economic development as a prerequisite and as a result of poor economic development. Case studies of each country are considered the appropriate geographic unit of analysis of demographic change rather than regional or comparative studies. The economic crises in sub-Saharan Africa occurred due to both external (commodity prices, high real interest rates, and decreasing net capital flows) and internal distortions (strategies of development such as import substitution, neglect of the agricultural sector, and government control of prices and trade). The unfavorable external context reduced export prices and earnings while increasing the costs of imports. Internal controls were detrimental to farmers. During the 1970s and 1980s African countries experienced declines in both the volume and value of exports, increases in import volume, and imbalances in the balance of payments. Large domestic borrowing and foreign borrowing was done by governments, which was at the expense of the private sector. Economic management and corruption were rampant. SAPs restrained demand, reduced public expenditures, adjusted exchange rates, contracted the size of the public sector, liberalized trade, deregulated the interest rate, stimulated domestic production, and used market forces for balancing optimum allocation of resources. SAPs were the fix for trade imbalances and government debt. Development was slowed or stopped. During 1980-87 spending on health care, education, and infrastructure was drastically reduced. These already weak sectors were further weakened. Inflation rose. Public sector employment was reduced. Wages declined, which resulted in a massive demoralization, unemployment, and poverty. Manpower development was threatened by declines in education.^ieng

Biochemical studies of the effect of gossypol consumption on cholesterol and residual glucose in fed and protein-energy deficient rats.

Some biochemical parameters were investigated on gossypol consumption, and were correlated to the level of cholesterol and residual glucose in rat liver. Two groups of animals were used, one group was fed with normal protein diet and the other set was fed with low protein diet. The results show that gossypol produced no apparent biochemical aberration in the liver of normal protein fed and low protein fed rats. It also had no effect on glucose-6-phosphatase and prostate phosphatase. Gossypol consumption had a significant effect on alcohol dehydrogenase. These results indicate no direct involvement of gossypol in sugar uptake but profound influence on the regulation of cholesterol level in the liver.

Preliminary analysis of emigration dynamics in Sub-Saharan Africa.

PIP: Migration is so prominent in African history that several observers have concluded that it is a way of life for many Africans. Considerable migration has occurred historically throughout Africa in response to political, economic, religious and security situations, ethnic tensions, and demographic pressures. Patterns, directions, and motivations of migration have been severely affected by the colonial experience which, in turn, has influenced economic, sociocultural, political, and demographic development. Historical and political links between African and colonial countries initially facilitated migration toward the UK, France, Belgium, and later to the US, Canada, and Germany. Under a lengthy recession, however, these Western economies have severely restricted the flow of immigration. This paper discusses the data situation, the economic regime, the demographic regime, the political regime, the micro-macro context, the cultural regime, the ecological setting, political change and uncertainty in South Africa, the intra-African exchange of skilled manpower, and implementing the IOM/UNFPA project in sub-Saharan Africa.^ieng

Expulsion of illegals from Nigeria: round two.

PIP: Within 5 years of the initiation of the Protocol on Free Movement of Persons, and the implementation of the 1st phase regarding the right of entry for citizens of the Economic Community of West African States, Nigeria has twice evoked the very clauses of the Protocol to expel and periodically repatriate illegal aliens. The Minister of Internal Affairs gave several reasons why the influex of illegal aliens into Nigeria was difficult to control, 3 of these are: 1) Nigerian borders are too vast and porous and are hence difficult to police effectively; 2) nationals of neighboring countries -- Benin, Niger, Chad, Cameroon -- have common features, cultures, and traditions with Nigerians; and 3) identification of aliens is difficult at 1st sight once they enter Nigeria, and mix with people of the same ethnic and cultural milieu. The period of the short-lived oil boom in Nigeria, the expanded employment opportunities, and the enhanced wages consequent to the huge wage increases of the mid 1970's generated huge wage differentials between Nigeria and its neighbors. Although the events leading to the expulsion of aliens had been gradual, the actual expulsion was less dramatic and sudden than the 1983 quit order. The expulsion of illegal aliens from various parts of Africa is now a common phenomenon. Procedures to be followed before governments expel non-nationals are stated.^ieng

Illegals and expulsion in Africa: the Nigerian experience.

PIP: The persistence and widespread nature of undocumented migration in Africa is due to 1) the absence of barriers or the arbitrariness of national frontiers, 2) the large stretch of unpoliced borders, 3) ignorance about the existence of borders, and 4) the absence or inadequacy of migration laws and regulations in both the countries of origin and destination. The free movement of persons in Africa has a long tradition. Over a large part of Africa, international migration is regarded as an extension of internal migration. The free movement of persons across frontiers in Africa historically has been facilitated by the cultural affinity of communities divided by international boundaries and the colonial policies of both the French and British. The "migration" of nomads pays little regard to international borders and is largely undocumented, even in national censuses. The frontier workers along the borders of Uganda and Kenya where members of the same extended family live on both sides of the borders and commute daily are statistically regarded as international migrants, without regard for the sociocultural realities of the African situation. Political independence substantially altered the erstwhile free movement of persons across African countries as national governments enacted immigration laws and regulations. The newly independent countries wanted to reserve employment for nationals. The Sahelian drought, internal strife in Chad, the deteriorating economic situation in Ghana, the oil-lead economic boom in Nigeria, and the treaty on the free movement of people in the community accelerate the tempo of undocumented migration in West Africa. Also, migration laws and regulations are not always rigorously enforced. Expulsion and deportation are common policy measures directed at illegal migrants resident in African countries. In Nigeria, the events leading to the expulsion of aliens were gradual, but in all cases, the actual expulsion--or decisions to expel--are usually sudden and dramatic.^ieng