2017年 · 第06卷第03期

Although the focus in the area of health research may be shifting from infectious to non-communicable diseases, the infectious diseases of poverty remain a major burden of disease of global health concern. A global platform to communicate and share the research on these diseases is needed to facilitate the translation of knowledge into effective approaches and tools for their elimination. Based on the "One health, One world" mission, a new, open-access journal, Infectious Diseases of Poverty (IDP), was launched by BioMed Central in partnership with the National Institute of Parasitic Diseases (NIPD), Chinese Center for Disease Control and Prevention (China CDC)on October 25, 2012. Its aim is to identify and assess research and information gaps that hinder progress towards new interventions for a particular public health problem in the developing world. From the inaugural IDP issue of October 25, 2012, a total of 256manuscripts have been published over the following five years. Apart from a small number of editorials, opinions, commentaries and letters to the editor, the predominant types of publications are research articles (69.5%)and scoping reviews (21.5%). A total of 1 081 contributing authors divided between 323 affiliations across 68 countries, territories and regions produced these 256 publications. The journal is indexed in major international biomedical databases, including Web of Science, PubMed, Scopus and Embase. In 2015, it was assigned its first impact factor (4.11), which is now 2.13. During the past five years, IDP has received manuscripts from 90 countries, territories and regions across six continents with an annual acceptance rate of all contributions maintained at less than 40%. Content analysis shows that neglected tropical diseases (NTDs), followed by the "Big Three" (HIV/AIDS, malaria and tuberculosis)and infectious diseases in general comprise 88%of all publications. In addition, a series of 10 thematic issues, covering 118 publications in all, was published as separate parts of the first five volumes. These publications were cited 975 times, which equals an average of 8.3 times per publication. The current challenge is to identify cutting-edge research topics and attract and to publish first-rate publications leading to increasing importance and impact of the journal in its field.

It is widely known that the recent Ebola Virus Disease (EVD)in West Africa caused a serious disruption to the national health system, with many of ongoing disease focused programmes, such as mass drug administration (MDA)for onchocerciasis (ONC), lymphatic filariasis (LF)and schistosomiasis (SCH), being suspended or scaled-down. As these MDA programmes attempt to restart post-EVD it is important to understand the challenges that may be encountered. This commentary addresses the opinions of the major health sectors involved, as well as those of community members, regarding logistic needs and challenges faced as these important public health programmes consider restarting. There appears to be a strong desire by the communities to resume NTD programme activities, although it is clear that some important challenges remain, the most prominent being those resulting from the severe loss of trained staff.

With the rapid pace of population ageing, tuberculosis (TB)in the elderly increasingly becomes a public health challenge. Despite the increasing burden and high risks for TB in the elderly, targeted strategy has not been well understood and evaluated. We undertook a scoping review to identify current TB strategies, research and policy gaps in the elderly and summarized the results within a strategic framework towards End TB targets. Databases of Embase, MEDLINE, Global health and EBM reviews were searched for original studies, review articles, and policy papers published in English between January 1990 and December 2015. Articles examining TB strategy, program, guideline or intervention in the elderly from public health perspective were included.

Nineteen articles met the inclusion criteria. Most of them were qualitative studies, issued in high- and middle-income countries and after 2000. To break the chain of TB transmission and reactivation in the elderly, infection control, interventions of avoiding delay in diagnosis and containment are essential for preventing transmission, especially in elderly institutions and aged immigrants; screening of latent TB infection and preventive therapy had effective impacts on reducing the risk of reactivation and should be used less reluctantly in older people; optimizing early case-finding with a high index of suspicion, systematic screening for prioritized high-risk groups, initial empirical and adequate follow-up treatment with close monitoring and evaluation, as well as enhanced programmatic management are fundamental pillars for active TB elimination. Evaluation of TB epidemiology, risk factors, impacts and cost-effectiveness of interventions, adopting accurate and rapid diagnostic tools, shorter and less toxic preventive therapy, are critical issues for developing strategy in the elderly towards End TB targets.

TB control strategies in the elderly were comprehensively mapped in a causal link pathway. The framework and principals identified in this study will help to evaluate and improve current program, develop targeted strategy, as well as raise more discussions on the research priority settings and policy transitions. Given the scarceness of policy and evaluated interventions, as well as the unawareness of shifting TB epidemiology and strategy especially in developing countries, the increasing need of a ready TB program for the elderly warrants further research.

The impact of leprosy reduces health-related quality of life of affected patients, interfering with different factors such as nutrition. This study investigated the lipid profile, nutritional status, and risk for cardiovascular disease(CVD)in patients who underwent leprosy treatment in Brazil.

Eighty-four adult patients of both genders ranging in age from 20 to 60 years and diagnosed with paucibacillary (PB)or multibacillary (MB)leprosy were selected after undergoing multidrug treatment. The following data were collected: sociodemographic and clinical data; food intake; anthropometric measures (weight, height, and waist circumference); and lipid profile components (total cholesterol, high-density lipoprotein cholesterol[HDL-c], low-density lipoprotein cholesterol [LDL-c], and triglycerides).

Among the study population, there was a predominance of males (65.48%)aged 50 to 60 years, patients with an income of 248-496 American dollars (63.10%), patients who completed elementary school (65.48%), inactive patients(76.19%), non-smokers (46.43%), and non-drinking patients (69.05%). The levels (mean ± standard deviation)of total cholesterol were 193.8 ±29.4 mg/dL in the PB form and 203.5±41.7 mg/dL in the MB form. The mean LDL-c was 116.9 ± 22.7 mg/dL in PB patients and 121 ± 31.3 mg/dL in MB patients. Mean triglyceride levels were 123.4 ±45.2 mg/dL in the PB form and 147.4 ±88.9 mg/dL in the MB form. The evaluation of nutritional status showed that 41.67%of the patients were eutrophic, while 55.96%had excess weight. Food intake was significantly associated with HDL-c in male patients (P=0.0264)and with triglycerides in patients above the ideal weight (P=0.0049).

The risk of acquiring CVDs was observed to be high due to patients' excess weight and increased waist circumference. This study will guide clinicians in the adequate treatment of patients with leprosy in order to avoid adverse cardiovascular events.

Given that increase in temperature may alter host-parasite relationships, the anticipated rise in temperature due to global warming might change transmission patterns of certain diseases. However, the extent to which this will happen is not well understood.

Using a host-parasite system involving Bulinus globosus and Schistosoma haematobium, we assessed the effect of temperature on snail fecundity, growth, survival and parasite development under laboratory conditions.

Our results show that temperature may have a non-linear effect on snail fecundity and snail growth. Snails maintained at 15.5 °C and 36.0 °C did not produce egg masses while those maintained at 25.8 °C laid 344 and 105more egg masses than snails at 31.0 °C and 21.2 °C, respectively. Attainment of patency led to a reduction in egg mass production among the snails. However, the reduction in fecundity for snails maintained at 21.2 °C occurred before snails started shedding cercariae. Parasite development was accelerated at high temperatures with snails maintained at 31.0 °C reaching patency after three weeks. Furthermore, snail growth rate was highest at 25.8 °C while it was inhibited at 15.5 °C and reduced at 31.0 °C. Increase in temperature increased snail mortality rates. Snails maintained at 36.0 °C had the shortest survival time while those maintained at 15.5 °C had the longest survival time.

We concluded that temperature influences fecunxdity, growth, survival and parasite development in the snail and thus dictates the time it takes the parasite to complete the life cycle. This has implications on transmission of schistosomiasis in the context of global warming.

Malawi is a low-income country with high Tuberculosis (TB)burden. TB diagnosis delay and untimely initiation of treatment is still a major problem in Malawi which could increase the risk of tuberculosis transmission in the communities. This study investigated factors related to the diagnostic delay of tuberculosis from TB healthcare providers in the northern region of Malawi.

Nine focus group discussions were conducted with 57 participants in total. The participants were healthcare cadres including district TB officers, clinical officers, TB nurses, laboratory technicians and Health Surveillance Assistants(HSAs). NVivo (11.0)software was used for data analysis.

The factors related to diagnostic delay were categorized into three themes: client factors, institutional factors and healthcare provider related factors. Client's stigma and fear for HIV test, resource shortage within healthcare institutions and the healthcare workers' poor attitude against potential patients were among the most influential factors behind the TB diagnostic delay.

The TB control strategies should aim to reduce HIV stigma, improve resource supply and improve TB healthcare workers' morale in order to achieve timely TB diagnosis.

Infectious agents can activate self-reactive T cells. In general, infections trigger various mechanisms, including a lack of auto-tolerance, induction of costimulatory molecules on antigen presenting cells, and molecular simulation, in addition to cross-reactions between microbial antigens and self-antigens. HIV and leprosy coinfections lead to self-immunity with the production of autoantibodies. However, not enough data on the immune behaviour associated with this coinfection are available. Therefore, this study focused on the detection of autoantibodies against cellular antigens (AACA)in individuals with HIV and leprosy coinfection in the Amazon region.

Patients were distributed into four groups according to their infections: (i)coinfection with HIV and leprosy (n=23), (ii)infection with leprosy (n=33), (iii)infection with HIV/AIDS (n=25), and (iv)healthy blood donor controls (n=100). AACA were identified by indirect immunofluorescence and the samples were tested using a commercial diagnosis kit containing the antinuclear antibody HEp-2.

Morphologically, all stages of cell division were assessed in addition to the morphological features associated with the nuclear matrix, nucleolus, mitotic spindle, and cytoplasm. There was a high prevalence of AACA in the coinfection group (47.8%, n=11)when compared with the control group of healthy blood donors (2.0%). The results showed predominantly cytoplasmic staining in all groups analysed, and no difference was observed between the presence or absence of AACA and the leprosy forms (paucibacillary and multibacillary)in the coinfection group.

The results of this study show that despite the tendency of coinfected patients to have higher levels of autoantibodies, no correlation was observed between clinical and laboratorial variables and morbidity associated with HIV and leprosy coinfections or the levels of AACA in the serum of coinfected patients. These data are important to elucidate this complex relationship between HIV and leprosy and thus improve the follow-up of these patients.

Bacillary dysentery (BD)is an acute bacterial infection of the intestine caused by Shigella spp., with clinical symptoms ranging from fever to bloody diarrhoea to abdominal cramps to tenesmus. In Vietnam, enteric bacterial pathogens are an important cause of diarrhoea and most cases in children under 5 years of age are due to Shigella strains. The serogroups S. flexneri and S. sonnei are considered to be the most common. The main objective of this study was to, for the first time, assess the seasonal patterns and geographic distribution of BD in Vietnam, and to determine the climate risk factors associated with the incidence of BD in Kon Tum Province, where the highest rate of bacillary dysentery was observed from 1999 to 2013.

The seasonal patterns and geographic distribution of BD was assessed in Vietnam using a seasonaltrend decomposition procedure based on loess. In addition, negative binomial regression models were used to determine the climate risk factors associated with the incidence of BD in Kon Tum Province, from 1999 to 2013.

Overall, incidence rates of BD have slightly decreased over time (except for an extremely high incidence in 2012 in the north of Vietnam). The central regions (north/south central coast and central highlands)had relatively high incidence rates, whereas the northwest/east and Red River Delta regions had low incidence rates. Overall, seasonal plots showed a high peak in the mid-rainy reason and a second smaller peak in the early or late rainy season. The incidence rates significantly increased between May and October ("wet season")across the country. In Kon Tum Province, temperature, humidity, and precipitation were found to be positively associated with the incidence of BD.

Our findings provide insights into the seasonal patterns and geographic distribution of BD in Vietnam and its associated climate risk factors in Kon Tum Province. This study may help clinicians and the general public to better understand the timings of outbreaks and therefore equip them with the knowledge to plan better interventions(such as improving water, sanitation, and hygiene conditions)during peak seasons. This can, in turn, prevent or reduce outbreaks and onwards transmission during an outbreak.

A 29-year-old farmer from central China was sent into the Emergency Department of the Affiliated Hospital of Zhengzhou University. He had a 15-day history of persistent high fever, abdominal distention and pain. The patient was clinically diagnosed as appendicitis and peritonitis, and treated with antibiotics in a local hospital, did not improve. On exploratory laparotomy, the appendicular perforation and peritonitis were seen; appendicectomy were performed, and antibiotics were given. However, high fever and abdominal pain still persisted; intestinal adhesion and obstruction, ascites appeared. He was given the "critically ill notice". He had eosinophilia (12.95%)and the history of eating live frog tadpoles for treating his cutaneous pruritus 3 days before onset of the disease. Serum anti-sparganum antibodies assayed by ELISA were positive. This patient has hospitalized for one and half months and spend more than US$ 12 000. This patient was primarily diagnosed as visceral sparganosis, and cured with praziquantel.

Sparganosis is one neglected but important parasitic zoonosis of poverty. Human infections were mainly acquired by eating raw or uncooked meat of frogs and snakes infected with plerocercoids, using frog or snake flesh as poultices, or drinking raw water contaminated with infected copepods. However, sparganosis caused by ingestion of live tadpoles are emerging in central China. Our surveys showed that 11.93%of tadpoles in Henan province are infected with plerocercoids. Eating live tadpoles is a high risk for sparganum infection. The comprehensive public health education should be carried out for people in endemic areas and the bad habit of eating live tadpoles must be discouraged.

Rebuilding transformation strategies in post-Ebola epidemics in West Africa requires long-term surveillance and strengthening health system preparedness to disease outbreak. This paper assesses reconstruction efforts from socio-cultural, economic and ecological transformation response approaches and strategies in improving sustainable survivors and affected communities livelihood and wellbeing. A comprehensive approach is required in the recovery and rebuilding processes. Investing in rebuilding transformation requires fostering evidence-based and effective engaging new investors partnership strengthening, financing community-based programmes ownership, novel socio-economic innovations strategies and tools against the evolving and future Ebola epidemics. Thus, there should be improved community partnership, health and economic rebuilding programmes to address mistrust and care underutilization, poverty and care access inequity at all levels. Implementing effective post-Ebola national 'One Health' approach coupled with climate change mitigation and adaptations strategies is urgent public health needs aiming at improving the quality healthcare access, delivery trust and uptake in anticipation of EVD immunization program, productivity and emerging economy.

Canines, the definitive hosts for the parasites causing alveolar (AE)and cystic echinococcosis (CE), are the main source of this infections playing the key role in the transmission. The ten-year mortality rate of AE is extremely high (94%)if the patients are not given sustained treatment. The aim of this field study is to explore the possibility of delivery of praziquantel-laced baits using unmanned aerial vehicles (UAVs)aimed at deworming wild canines in the endemic areas.

UAVs were compared to manual bait delivery in the 1-km² test areas followed by testing of canine faeces using an Echinococcus coproantigen ELISA test in the ensuing year. The outcomes of the two approaches were compared with respect to time of delivery and overall cost.

Compared to manual bait delivery, delivery by UAVs saved up to 67%of the overall cost. Three times more staff was needed for the former approach compared to the latter and, time wise, UAV bait delivery saved 350%compared to manual bait delivery on average. With regard to investment needed, the use of UAVs showed an efficiency 2.5 times better than manual bait delivery. Compared to the area served by UAVs, the average positive rate for the canine faecal samples was more than 38%higher in the area served manually.

The technique of bait delivery with praziquantel using UAVs for canine deworming has a strong potential with regard to savings of manpower, time and overall cost in areas highly endemic for echinococcosis.