边远贫困山区少数民族疟疾诊治干预效果分析

目的 探讨改进边远贫困山区少数民族疟疾诊断和治疗可及性策略.方法 免费提供疟疾诊断和治疗;培训当地本民族的村疟防员制作发热病人血片,为疟疾病人送药并监督服药,开展以入户为主的面对面健康教育.结果 村卫生人员与居民比从干预前的1:1 116.75改变为干预后的1:248.17;发热开始24 h内求医病人比例,使用公共卫生机构发热病人比例和对疟防服务满意村民比例分别从基线的23.03%(95%CI=18.81～27.71).56.94%(95%CI=52.55～61.25)和82.65%(95%CI=81.23～86.31)提高到干预后评估调查的86.95%(95%CI=68.47～96.57),91.30%(95%CI=74.13-98.51)和96.81%(95%CI=93.08～98.82).结论 改进当地经济、地理、信息和文化方面疟疾诊治可及性,与其他措施一起有效地降低了当地疟疾的发病和流行程度.     

Perception of causes of malaria and treatment-seeking behaviour of nursing mothers in a rural community

OBJECTIVE: Maternal health care workers' recognition of malaria, its transmission and treatment of children's fever at community level. DESIGN: Randomised sampling of households with children of 0-5 years. SETTING: Rural community in a forest zone. Subjects: Fifty-five households at Ijegemo village, Ogun state, Nigeria were sampled and questionnaires administered to 200 mothers/care workers of children within the age group 0-5 years. Blood smears were obtained from finger pricks and level of parasitemia with malaria parasites determined for each child. MAIN OUTCOME MEASURES: Interactions with the women during the survey empowered them with accurate knowledge of malaria recognition, transmission and management of children's fever at the community level. RESULTS: Forty per cent of the respondents did not know the exact cause of malaria, 20% attributed the cause to sunlight, 16.5% to mosquitoes, 12.5% to poor hygiene, 4% to palm oil intake, 4% to blood shortage and 6% to a hot body. Of respondents 85.5% identified stagnant water as breeding site of mosquitoes but could not correlate it with the occurrence of malaria fever. Herbal concoction was the first treatment action. Some of these herbs are listed in the text. Plasmodium falciparum alone was identified in all blood smears. Children at two to three years of age were recorded with the highest percentage (67.5%) of parasite-positive cases with a mean value of 1237.04 +/- 2113.19. CONCLUSION: This study highlights a critical need for targeting health messages towards poorly educated women in order to empower them with the knowledge and resources to recognise and manage their children's health problems.     

The influence of cultural perception of causation, complications, and severity of childhood malaria on determinants of treatment and preventive pathways

A cluster sample of 2,052 mothers and other caregivers of children from southwest Nigeria was studied. Qualitative and quantitative methods of data collection were employed, including semi-structured questionnaires, focus groups, in-depth interviews, and parasitological investigation forms/blood smears. "Too much work" (17.7%) and "too much sun" (12.6%) were the two most-often mentioned causes of malaria. Malaria was not perceived as a serious disease. Convulsions and anemia are not perceived as complications of malaria and are preferentially treated by traditional healers. Fifty-eight and one-half percent of children with malaria were treated at home. Choice of drugs used was based on previous experience and advice from various members of the community. Fathers (53.5%) and mother (32.5%) decided on where ill children received treatment. Mothers (51.5%) paid for the drugs more often than fathers (44.6%). Symptoms described as "iba lasan," which means "ordinary fever," conform to the clinical case definition of malaria. Cultural practices that are likely to influence appropriate treatment-seeking include cultural perception of malaria as ordinary fever, wrong perceptions of severe malaria, and father's role as decision maker.     

Malaria on the Thai-Burmese border: treatment of 5192 patients with mefloquine-sulfadoxine-pyrimethamine

Multidrug-resistant falciparum malaria is a major health problem along the Thai-Burmese border. From July 1985 until December 1986 a total of 5192 patients with falciparum malaria (1734 males, 3458 females) from this area were given supervised treatment with the combination mefloquine—sulfadoxine—pyrimethamine (MSP). The radical cure rate, assessed 21 days after drug administration, was 98.4% for the first 1975 patients, and 98.8% when assessed at 28 days for the remaining 3217 patients. In 3.8% of cases, parasites were still detected in peripheral blood smears on day 7 after treatment but this had fallen to 0.27% by day 9. Adverse reactions among the first 1975 patients were: vertigo (7.5% of patients), vomiting (5.8%), epigastric pain (0.6%), and transient confusional state (one case). MSP is an effective and well-tolerated drug for the treatment of drug-resistant falciparum malaria; however, delayed parasite clearance may give a false impression of RII resistance.     

Malaria and Anemia among Children in a Low Resource Setting In Nigeria

Background

This study aimed at determining the prevalence of malaria and anemia among children in rural community of Okada, Edo State Nigeria, as well as to assess the level of use of Insecticide treated bed nets and its impact on prevalence of malaria and anemia among study population.

Methods

Thick blood films from 226 children with signs and symptoms of malaria in Okada community were stained and examined for presence of malaria parasites. Hemoglobin concentration of all children was also determined using standard method.

Result

A total of 185 (81.9%) children were infected with malaria parasite. Malaria parasitaemia was significantly affected by age (P =0.003). A significantly higher number of positive cases of malaria and anemia was observed in rainy season as compared to dry season (P<0.05). The prevalence of anemia in children was 47.3%. Malaria was a risk factor for development of anemia in children (OR=2.551; 95% CI=1.227, 5.305; P=0.015). Use of insecticide treated bed nets was recorded in 11(4.9%) of children studied, and did not significantly reduce the prevalence of malaria and anemia. However among malaria parasite infected children, its use significantly reduced the prevalence of anemia (OR=0.126; 95%CI=0.015, 1.047; P=0.031).

Conclusion

Malaria and anemia among children was high malaria intervention progammes by relevant agencies is strongly advocated.     

Placental malaria in Owerri, Imo State, south-eastern Nigeria

Malaria in pregnancy jeopardizes the outcome of pregnancy, affecting both the mother and the foetus. The prevalence of placental malaria in women, who routinely attended ante-natal clinics in Owerri, south-eastern Nigeria, was assessed using three hospitals between March 2004 and August 2005. Placental blood was collected in EDTA bottles from incisions made on cleaned basal plate of the placenta, within an hour of delivery. Blood collected was used to assess ABO blood group, haemoglobin level as well as malaria parasitaemia. Malaria parasitaemia was determined from thick and thin smears stained with Giemsa, while the haemoglobin level was measured using the cyanomethaemoglobin method. A total of 586 pregnant women were involved in this study with written consents. Malaria parasites were observed in 175 (29.9%) of the women on delivery. Of these women, 64 (36.6%) were anaemic. A significant relationship at P<0.05 variation, was observed between the prevalence of malaria parasites in the placenta and gravidity, age and blood group. The rate of occurrence of malaria parasitaemia, in the placenta of women who were on a weekly prophylaxis against malaria is alarming and calls for more serious efforts in the prevention of malaria especially in this vulnerable group.     

Some aspects of Yoruba traditional healers and their practice

156 traditional healers/midwives randomly selected from all over the Yoruba-speaking areas of Nigeria were studied. Sociological data (age, sex, religion, educational status) and other details of their personal and job histories were documented. The results showed, amongst other things, that 72·4% of the 156 herbalists interviewed were more than 40 years old. The study also revealed that all traditional healers/midwives are trained before they start to practise and that people from all walks of life, irrespective of their educational and socio-economic status, illiterates, literates, students, traders, top professionals, nurses, doctors and clergymen consult traditional healers for diverse reasons.Some herbalists specialize, others are general practitioners. More than 50% of the herbalists earn enough from their practice for their upkeep. Patients pay for their treatment in cash or in kind. 125 (80%) of the herbalists were willing to cooperate with western-trained doctors if this is suggested.The results of this study were compared and contrasted with the practice of traditional medicine in other parts of Nigeria and other countries of the world where similar practices are still in vogue.     

Concomitant bacteria in the blood of malaria patients in Owerri, southeastern Nigeria

The presence of concomitant bacteria was assessed in the blood of 125 malaria positive patients and 60 malaria negative controls, resident in Owerri, southeastern Nigeria. Blood samples were cultured in MacConkey, Chocolate and Blood agar, respectively using oxoid signal system after the manufacturer's instructions. Blood cultures of 44 (35.2%) of the 125 malaria positive patients had bacterial growth while none was observed in the blood cultures of malaria negative patients. The bacteria species identified included: Staphylococcus aureus 4 (3.2%), Escherichia coli 3 (2.4%) Salmonella typhi 25 (20%), Klebsiella pneumoniae 10 (2.4%) and Pseudomonas aeruginosa 2 (1.6%). The presence of concomitant bacteria in malaria-positive cases usually results in persistence of malaria-like symptoms after treatment with antimalarials and subsequently taken as resistance of the parasites to the particular drugs in question. The significance of concomitant bacteria in the management of malaria should be given priority.     

Congenital malaria. Parasitological and serological studies in Niamey (Niger)

Congenital malaria is defined as the presence of Plasmodium parasites in the erythrocytes of newborns less than seven days old. The aim of this study was to determine the incidence of congenital malaria and its possible clinical consequences. We carried out a prospective survey in Niamey, the capital of Niger (600,000 inhabitants) from July to September 1993. Niamey is in an area of mesoendemic malaria and this period of the year corresponds to the rainy season, when malaria transmission is maximal. Ninety mothers and their newborns were included. We assessed the clinical status of the mother and child at the time of the delivery, and took blood smears to check for parasitemia and blood samples to check for antimalaria antibodies by indirect immunofluorescence (IIF). The placenta was not examined. Clinical signs of malaria (fever, splenomegaly, anemia and jaundice) were absent in all mothers and children and 88 of the 90 children had normal birth weights. Plasmodium falciparum was the only parasite detected, with 49 of the 90 mothers and 12 of the 90 newborns having positive blood smears. Serological tests detected the presence of antimalaria antibodies in 73 of the 90 mothers (81.1%) and 68 of the 90 newborns (75.5%). Thus, we found no cases of congenital malaria with clinical signs in this study, despite the high frequency of parasites and antimalaria antibodies. The reasons for this absence of cases of congenital malaria with symptoms are discussed.     

Application of malariometric data obtained from longitudinal studies in infants in Northern Nigeria

In Northern Nigeria some 11 000 blood films taken from infants were examined for the presence of malaria parasites during the course of WHO field trials of new insecticides. A first film was taken, in most cases, within the first month and the subsequent ones at monthly intervals thereafter. Analyses of the results obtained from these longitudinal studies were made according to the malaria transmission season, and infant parasite incidences were calculated.     

Onchocerciasis in Imo state, Nigeria (2): the prevalence, intensity and distribution in the upper Imo river basin

Human infection with Onchocerca volvulus was investigated in 13 rural communities in the Upper Imo River basin, Imo State, Nigeria between March 1997 and December 2000 using the skin snip method. Of the 3,311 persons examined, 889 (26.8%) had microfilariae. There were significant differences between communities in microfilariae prevalence and intensity of infection (P<0.05). Sex infection was similar in males (26.8%) and females (26.9%); whereas farmers (46.6%) and fishermen (28.4%) were more affected than people in other occupations. The proportion of infected persons increased with age coinciding with the period when most clinical signs manifest. A significant proportion of the 889 persons with positive microfilariae skin biopsy had musculoskeletal pain (57.1%). Thirty-four (47.2%) of the 72 epileptics identified had positive skin biopsy in addition to other manifestations. The present findings show that onchocerciasis is a public health problem in the area. The use of ivermectin has reduced the incidence of the disease when compared with data from the pre-ivermectin era. This shows that Community Directed Treatment with Ivermectin (CDTI) campaign is successful and should be sustained until onchocerciasis is eliminated as a public health problem in the area.     

Anemia in a population from an endemic area of malaria, Rond?nia (Brazil)]

With the purpose of describing the prevalence rate of anaemia among inhabitants of a malaria endemic area--Candeias district, a periurban locality near Porto Velho, in Rond?nia State, Brazilian Amazon Basin--a random population sample comprehending 1,068 individuals of all age groups (14.1% of the total population) was screened for anaemia (measurement of blood haemoglobin concentration) and malaria (Giemsa-stained thick-smear microscopy). Two-hundred and ninety-nine individuals (28.0% of the sample) were found to be anaemic, using the cut-off haemoglobin values proposed by the World Health Organization for each age group. Highest prevalence rates were found among children with ages varying from 6 months to 1 year (70.0%) and from 1 to 6 years (38.4%), as well as in pregnant women (41.2%, 7/17) and malaria patients (44.4%, 8/18). Parasitological stoll examinations were made on a voluntary sample of 476 individuals (44.6% of the sample population); of these, 118 (26.8%) were positive. Eggs of Ascaris lumbricoides, the most frequent intestinal parasite in this population sample, was detected in 67 stool samples (14.1%); only 27 patients (5.7%) eliminated Ancylostomidae eggs. In this voluntary sample, no significant difference in anaemia prevalence rates between parasite carriers and non-parasited individuals was detected. On the other hand, the more recent the last malarial episode referred to by the patients, the lighter prevalence rate of anaemia in individuals above the age of 14 years. The role played by malaria as an underlying cause of anaemia in Candeias district inhabitants, particularly in the economically active age group, is further discussed.     

Is parasite clearance clinically important after malaria treatment in a high transmission area? A 3-month follow-up of home-based management with herbal medicine or ACT

Argemone mexicana (AM), a validated herbal medicine for uncomplicated malaria, seems to prevent severe malaria without completely clearing parasites in most patients. This study, in a high transmission area of South Mali, explores whether residual parasitaemia at day 28 was associated with subsequent malaria episodes and/or anaemia.Three hundred and one patients were randomly assigned to AM or artesunate/amodiaquine as first line treatment, of whom 294 were followed up beyond the standard 28 days, to 84 days. From day 29 to day 84, there were no significant differences between treatment groups in new clinical episodes of uncomplicated malaria (0.33 vs 0.31 episodes/patient), severe malaria (<6% per month of patients aged ≤5 years) or moderate anaemia (hematocrit <24%: 1.1% in both groups at day 84). Total parasite clearance at day 28 was not correlated with incidence of uncomplicated or severe malaria or of moderate anaemia over the subsequent two months.Total parasite clearance at day 28 was not clinically important in the context of high transmission. If this finding can be confirmed, some antimalarials which are clinically effective but do not completely clear parasites could nevertheless be appropriate in high transmission areas. Such a policy could be tested as a way to delay resistance to artemisinin combination therapies.     

Sensitivity of Plasmodium falciparum to chloroquine and sulfadoxine/pyrimethamine in Nigerian children

The in vivo sensitivity of Plasmodium falciparum to chloroquine and sulfadoxine/pyrimethamine was evaluated in children under 5 years of age in two areas of southern Nigeria in 1987. A modification of the WHO Standard Field and Extended Tests (in vivo) was used, with follow-up on days, 2, 3, 7, and 14 after treatment with 25 mg chloroquine per kg body weight given over 3 days, or with standard doses of sulfadoxine/pyrimethamine. Clinical and parasitological evaluations were performed. At Igbo Ora, in Oyo State, where by day 7 chloroquine was clinically successful in 94.4% of 36 children and sulfadoxine/pyrimethamine in 91.7% of 36 children, there were no parasitological failures in either treatment group. Fever regressed significantly more rapidly with chloroquine than with sulfadoxine/pyrimethamine. At Oban, in Cross River State, initial parasite densities decreased markedly with the chloroquine regimen but 63.6% of 44 children were parasitological failures on days 3, 7, or 14; and all of the 26 children who failed parasitologically and completed follow-up were successfully treated with sulfadoxine/pyrimethamine. By day 7, clinical success was demonstrated for 77.3% of the children treated with chloroquine. The in vitro sensitivity to chloroquine, quinine, and mefloquine at Igbo Ora indicated that isolates of P. falciparum were sensitive to chloroquine and quinine, but had reduced sensitivity to mefloquine. Because of its continued clinical efficacy, chloroquine remains the recommended treatment for children with uncomplicated malaria in Nigeria. Health providers are, however, encouraged to maintain supplies of sulfadoxine/pyrimethamine as an alternative and to refer patients promptly if necessary.     

Urban yellow fever epidemic in western Nigeria, 1987

A large epidemic of urban yellow fever occurred in April and May 1987 in Oyo State, western Nigeria. The principal vector was Aedes aegypti, breeding in domestic water containers. The 1987 outbreak followed an epidemic of sylvatic yellow fever in eastern Nigeria the previous year, and probably resulted from introduction of the virus by viraemic travellers. The outbreak in Oyo State ended in early July, by which time 805 cases and 416 deaths had been officially notified. However, surveys of 3 villages in the epicentre, a region with over 4 million inhabitants, indicated an infection rate of approximately 20%, a clinical attack rate of 2.9% and a mortality rate of 0.6%, suggesting that the true incidence of cases and deaths far exceeded the official reports. Yellow fever virus was isolated from persons with fully developed yellow fever as well as mild febrile illness. One virus isolate was made from blood of an individual with mild illness, who had received 17D vaccine 5 d earlier; monoclonal antibody analysis showed that the isolate was a wild-type virus. Larval indices of Ae. aegypti were very high; however, low vector competence of the Ae aegypti population may have provided a constraint on spread of the epidemic. In late 1987 a third epidemic appeared in Niger State, northern Nigeria, with 644 reported cases and 149 deaths. The vector(s) involved is (are) unknown.     

Asymptomatic Malaria among Blood Donors in Benin City Nigeria

Background

This study aimed at determining the prevalence and associated risk factors for asymptomatic malaria parasitaemia and anemia among blood donors in a private medical laboratory in Benin City, Nigeria.

Methods

Venous blood was collected from a total of 247 blood donors. Malaria status, ABO, Rhesus blood groups and hemoglobin concentration of all participants were determined using standard methods.

Results

The prevalence of asymptomatic malaria infection was higher among commercial blood donors than volunteer group (commercial vs volunteer donor: 27.5 %vs. 13.8%; OR = 2.373, 95% CI = 0.793, 7.107, P = 0.174). Asymptomatic malaria was not significantly affected by gender (P = 0.733), age (P = 0.581), ABO (P = 0.433) and rhesus blood groups (P = 0.806) of blood donors. Age was observed to significantly (P = 0.015) affect malaria parasite density with donors within the age group of 21-26 years having the highest risk. The prevalence of anemia was significantly higher among commercial donors (commercial vs volunteer donors: 23.4% vs 3.4%: OR = 8.551, 95% CI = 1.135, 64.437, P = 0.013) and donors of blood group O type (P = < 0.0001).

Conclusions

Asymptomatic malaria parasitaemia and anemia was higher among commercial donors than voluntary donors. Mandatory screening of blood donors for malaria parasite is advocated to curb transfusion transmitted malaria and associated sequelae.     

Consumer response and satisfaction to prepackaged antimalarial drugs for children in Aba, Nigeria

In July 2003, a consortium of three USAID partners launched a project to promote the correct use of color-coded, age-specific, prepackaged drugs (PPDs) to treat malaria promptly in preschool-aged children in Aba, Abia State, Nigeria. A 3-pronged promotional approach included training of patent medicine vendors (PMVs), home visits by community health promoters, and mass media. Five hundred seventy respondents were interviewed in February-March 2004. People heard about the PPDs from medicine sellers (33.4%), health workers (24.3%), the electronic mass media (18.4%), and friends or relatives (13.5%). Most children (81.1%) took Robaquine (chloroquine-CQ), while 108 (18.9%) took Fansidar (sulphadoxine-pyrimethamine-SP). The median amount paid for Robaquine was 50 naira (dollars 0.36) and for Fansidar, 80 naira (dollars 0.57). Respondents rated the effectiveness of the PPD treatment as very effective (86.8%). Most respondents had something positive to say about the drug (94.9%) and the packaging (93.8%). Only 19.5%) had a complaint about either the drug or the packaging. Overall, 454 (83.9%) received the correct age-appropriate packet. Continuing education is needed for the PMVs to ensure that they obtain accurate age information about the child and sell the age-specific packet. Underdosing is just as serious a concern as overdosing in Nigeria where parasite resistance is rapidly developing for both drugs.     

Asymptomatic Plasmodium parasitaemia in pregnant Nigerian women: almost a decade after Roll Back Malaria

Malaria during pregnancy is a major cause of fetal and maternal morbidity and mortality. In malaria-endemic areas, the condition may remain asymptomatic but is still associated with complications. The objective of this study was to determine the prevalence of asymptomatic malaria parasitaemia and its relationship with various sociodemographic characteristics. The study was performed at three hospitals in Enugu, the centre of southeast Nigeria, during the rainy season between March 2006 and October 2007. Pregnant women attending the antenatal clinic at the index pregnancy were randomly selected and counseled, and peripheral blood samples were collected for malaria parasite and packed cell volume estimation. Age, parity, gestational age at booking, degree of anaemia and parasite density were recorded. Of 125 pregnant women tested, 73 had microscopic Plasmodium parasitaemia, giving a prevalence of 58.4%. Asymptomatic malaria parasitaemia was more common in primigravidae, in the second trimester and in the younger age group. Anaemia in pregnancy was prevalent (55.2%) and there was no significant difference in the density of parasitaemia in those with mild, moderate and severe anaemia. The prevalence of Plasmodium parasitaemia in pregnant Nigerian women is still very high nearly a decade after Roll Back Malaria. It is therefore pertinent to reappraise Roll Back Malaria strategies or to design a more effective programme for the prevention and treatment of malaria in pregnancy.     

Parasitological profile of the surveyed population for malaria in an endemic area in Faiyoum Governorate, Egypt

Egypt represents the only focus in the Mediterranean region where Plasmodium falciparum transmission still occurs. A longitudinal parasitological study has been implemented (September 1995 to December 1996) in Faiyoum, Egypt. A total of 9065 blood slides for malaria parasites were taken from all people in the study area as mass blood examination (MBE); those attending the malaria unit as passive case detection (PCD) as well as from neighborhood of the detected cases (NOD). They were stained by Giemsa stain and examined under standard conditions for positivity, parasite species and parasite density. Our results show that MBE detected 61.5% of malaria cases while 23.1% and 15.4% of the confirmed cases were detected through PCD and NOD respectively. The overall parasite rate was 5.7/1000 examined population. P. falciparum was the most predominant species (96.1%), followed by P. vivax (3.9%). The epidemiological factors causing the persistence of malaria transmission in the study area are discussed.     

四川口岸从回国劳务人员中连续发现恶性疟疾病例

〔目的〕加强对来自来疫区的回国人员的传染病监测,防止输入性疫情进一步扩散。〔方法〕对2006年6月19￣21日发现的4例疑似疟疾病例进行临床诊断和流行病学调查。〔结果〕4例病人均有疟疾流行病区(尼日利亚)生活工作史,有疟疾样症状和抗疟治疗史。此次发病表现为间歇性发作寒战、高热、大量出汗,其中2例有脾肿大;实验室检测结果:pf( )、p( )、c( ),提示为恶性疟感染;血液涂片查见恶性疟原虫。综合分析后,确诊为输入性恶性疟疾。〔结论〕目前,国内已发现不少由境外疟疾流行区感染的疟疾病例,许多地区受到输入性恶性疟疾的威胁。各级医疗单位和临床医生应提高对疟疾等传染病的认识;各相关部门协作配合,加强对出国劳务人员传染病防治知识的宣传教育,制定有效措施,以达到防止传染病传入的目的。