Category Archives: Severe Malaria

The Weekly Tropical Health News 2019-07-13

Agriculture, Borders, Ebola, Essential Medicines, Integrated Vector Management, ITNs, Larvicide, Mosquitoes, Schistosomiasis, Severe Malaria, Vaccine, Vector Control

In the past week more attention was drawn to the apparently never-ending year-long Ebola outbreak in the northeast of the Democratic Republic of the Congo. Regarding other diseases, there is new information on the RTS,S malaria vaccine, river prawns have been found to play a biological control role in schistosomiasis, and an update from the World Health Organization on essential medicines and diagnostics. New malaria vector control technologies are discussed.

Second Largest Ebola Outbreak One Year On

Ronald A. Klain and Daniel Lucey in the Washington Post observed raised concern that, “the disease has since crossed one border (into Uganda) and continues to spread. In the absence of a trajectory toward extinguishing the outbreak, the opposite path — severe escalation — remains possible. The risk of the disease moving into nearby Goma, Congo — a city of 1 million residents with an international airport.”

They added their voices to a growing number of experts who are watching this second biggest Ebola outbreak in history and note that, “As the case count approaches 2,500 with no end in sight, it is time for the WHO to declare the outbreak a public health emergency of international concern — a ‘PHEIC’ — to raise the level of global alarm and signal to nations, particularly the United States, that they must ramp up their response.” They call for three actions: 1) improved security for health workers in the region, 2) stepped up community engagement and 3) extended health care beyond Ebola treatment. The inability to adequately respond to malaria, diarrheal diseases and maternal health not only threated life directly, but also threated community trust, putting health workers’ lives at risk.

Olivia Acland, a freelance journalist based in DRC, reporting for the New Humanitarian describes the insecurity and the recent “wave of militia attacks in the Democratic Republic of Congo’s northeastern Ituri province has left hundreds dead and roughly 300,000 displaced in recent weeks, triggering a new humanitarian crisis in a region.” Specifically, “Ituri, a fertile region rich in gold deposits, has been an epicentre of conflict in Congo for decades. Between 1999 and 2003, around 60,000 people were killed here, as a power struggle between rebel groups escalated into ethnic violence,” related to traditional tensions between Hema cattle herders and Lendu farmers with roots in Belgian colonization.

Updates from the DRC Ministry of Health report on average 11 new Ebola cases per day in the past week. So far over 160,000 people have been vaccinated, and yet the spread continues. The Ministry also describes new protocol contains three vaccinations strategies that can be used depending on the environment in which confirmed cases are found including:

  • Classic Ring: The classic strategy of vaccinating contacts of confirmed cases and contact contacts.
  • Enlarged ring: It is also possible to vaccinate all inhabitants of houses within 5 meters around the outbreak of a confirmed case.
  • Geographical Ring: In an area where team safety can not be guaranteed, they can vaccinate an entire village or neighborhood.

Malaria Vaccines, Essential Drugs and New Vector Control Technologies

Halidou Tinto and colleagues enrolled two age groups of children in a 3-year extension of the RTS,S/AS01 vaccine efficacy trial: 1739 older children (aged 5–7 years) and 1345 younger children (aged 3–5 years). During extension, they reported 66 severe malaria cases. Overall they found that, “severe malaria incidence was low in all groups, with no evidence of rebound in RTS,S/AS01 recipients, despite an increased incidence of clinical malaria in older children who received RTS,S/AS01 compared with the comparator group in Nanoro. No safety signal was identified,” as seen in The Lancet.

WHO has updated the global guidance on medicines and diagnostic tests to address health challenges, prioritize highly effective therapeutics, and improve affordable access. Section 6.5.3 presents antimalarial medicines including curative treatment (14 medicines) for both vivax and falciparum and including tablets and injectables. Prophylaxis includes 6 medicines including those for IPTp and SMC. The latest guidance can be downloaded at WHO.

Paul Krezanoski reports on a new technology to monitor bednet use and tried it out in Ugandan households. As a result. “Remote bednet use monitors can provide novel insights into how bednets are used in practice, helping identify both households at risk of malaria due to poor adherence and also potentially novel targets for improving malaria prevention.

In another novel technological approach to vector control, Humphrey Mazigo and co-researchers tested malaria mosquito control in rice paddy farms using biolarvicide mixed with fertilizer in Tanzanian semi-field experiments. The intervention sections (with biolarvicide) had lowest mean mosquito larvae abundance compared to control block and did not affect the rice production/harvest.

Prawns to the Rescue in Senegal Fighting Schistosomiasis and Poverty

Anne Gulland reported how Christopher M. Hoover et al. discovered how prawns could be the key to fighting poverty and schistosomiasis, a debilitating tropical disease. They found that farming the African river prawn could fight the disease and improve the lives of local people, because the African river prawn is a ‘voracious’ predator of the freshwater snail, which is a carrier of schistosomiasis.

The researchers in Senegal said that, “market analysis in Senegal had shown there was significant interest among restaurant owners and farmers in introducing prawns to the diet.” The prawn could also for the basis of aquaculture in rice paddies and remove the threat of schistosomiasis from the rice workers.

—- Thank you for reading this week’s summary. These weekly abstractings have replaced our occasional mailings on tropical health issues due to fees introduced by those maintaining the listserve website. Also continue to check the Tropical Health Twitter feed, which you can see running on this page.

World Kidney Day and Severe Malaria

Severe Malaria

A new review by Conroy, Datta, and John highlights the connection between the kidneys and malaria on this World Kidney Day. They explain that “15 years ago, renal failure was considered a rare complication in children with Severe Malaria, yet it is now recognized as one of the strongest predictors of mortality in severe malaria.”

While severe malaria is related to reduced kidney perfusion, Conroy et al. note that, “additional studies are needed to evaluate the spectrum of AKI over hospitalization to define the etiology and pathophysiology of acute kidney injury in pediatric severe malaria.” In the diagram to the right, they show that kidney involvement is among the most deadly forms of severe malaria.

These problems are not limited to Africa. Dayanand and colleagues describe “single or multi-organ dysfunction involving liver, kidney, and brain” occurring in Mangaluru, India.

Brown et al. warn travelers including people returning to endemic areas after a long absence to be aware of severe malaria dangers once they return to non-endemic countries. “Severe malaria can cause significant multiorgan dysfunction including acute kidney injury (AKI). The pathogenesis is not clearly understood but proposed mechanisms include acute tubular necrosis (ATN) due to impediments in renal microcirculation, infection-triggered proinflammatory reactions within the kidney, and metabolic disturbances.”

The World Health Organization’s Third Edition on its guidelines on managing severe malaria addresses acute kidney injury with attention to reversing dehydration, addressing reduced urine output and even the need for dialysis. Clearly the best response is prompt diagnosis and treatment when malaria is in its very early stages, and better yet, using insecticide treated bednets to prevent the problem in the first place.

 

 

Malaria Response Plan in Times of High Transmission: An Approach to Improving the Quality of Hospital Malaria Management

Case Management, Health Workers, Planning, Severe Malaria, Training

Ousmane Badolo, Stanislas Nebie, Youssouf Sawadogo, Thierry Ouedraogo, Moumouni Bonkoungou, Mathurin Dodo, Danielle Burke, William Brieger, and Gladys Tetteh of Jhpiego and the Improving Malaria Care Project (USAID) in Burkina Faso presented a poster on helping hospitals develop a malaria response plan. Their findings are shared below.

In Burkina Faso Malaria cases peak from June-September (rainy season), exceeding hospital capacity and causing high number of deaths, especially in children under 5 years of age. The Improving Malaria Care Project, funded by USAID/President’s Malaria Initiative, provided support to National Malaria Control Program to develop and implement malaria preparedness and response plans in all 11 regional hospitals

The Objectives of this effort aimed to describe development and implementation of malaria preparedness and response plan. From this the project planned to share lessons learned and challenges Malaria Preparedness and Response Plan Development and Implementation Process is seen in the attached chart.

In preparation of hospital staff for planning, the training reached Nurses and midwives were largest groups of trained providers at 52% and 30%, respectively. Providers were selected by hospital management team from pediatric maternity and emergency units.

Severe Malaria Cases Trend Regional Hospital in Burkina Faso is seen in the attached graph. In a second graph, Malaria Case Fatality Rate Trend at Regional Hospitals in Burkina Faso is shown. Even though there were more cases of severe malaria in 2017, Malaria case fatality rate decreased after implementing malaria response plan.

Challenges faced by the hospitals included Lack of funding for response plan activities, which were not included in the routine hospital work plan. Also there was a Lack of beds in some hospital rooms, especially in pediatric unit. Timing of clients coming to hospital posed a challenge as many do not come early and sometimes come when only complications start.

Lessons learned from the intervention include the fact that On-the-job training is opportunity to improve providers’ skills. Response plans must consider that providers’ refreshment, and securing blood and other commodities may improve severe malaria case management. Monthly data collection and analysis may highlight progress in malaria planning through case management and orient decision-making. Follow-up visits strengthened provider engagement on severe malaria case Management

In Conclusion, Response plans may provide a way to reduce malaria mortality. Each hospital should consider incorporating response plan into its annual work plan

This poster was made possible by the generous support of the American people through the United States Agency for International Development (USAID) under Cooperative Agreement No. AID-624-A-13-00010 and the President’s Malaria Initiative (PMI). The contents are the responsibility of the authors and do not necessarily reflect the views of USAID, PMI or the United States Government.

The Heart of the Malaria Problem

Case Management, Severe Malaria

February is Heart Month in some countries. This is a good time to explore how malaria affects the heart and cardiovascular health.

In 1946 Howard Sprague observed that although “malaria is a disease from which no organ or tissue is exempt, this paper is concerned with its influence upon the circulation, and more particularly upon the heart itself.” He then outlined four ways by which this influence happens:

  1. its chronic and recurrent nature
  2. the systemic toxemia of the paroxysm
  3. the profound anemia produced by hemolysis and suppression of hemopoiesis
  4. the occlusion of capillaries and arterioles of the myocardium

Since that time other researchers have elaborated on malaria and the cardiovascular system.

Mishra et al. raise a concern that, “The role of the heart in severe malaria has not received due attention.” They point out the following:

  • hypotension, shock and circulatory collapse observed in severe malaria patients
  • raised cardiac enzymes in complicated malaria
  • compromised microcirculation and lactic acidosis as well as excessive production of pro-inflammatory cytokines
  • Intravascular fluid depletion associated with severe malaria leading to impaired microcirculation … among others

They conclude that “Sudden cardiac deaths can also occur due to cardiac involvement,” but worry that, “It is not feasible to assess the cardiac indices in resource poor settings.”

A study by Ray and co-researchers indicated “involvement of cardiovascular system in severe malaria as evidenced from ECG and echocardiography. The study also revealed that cardiovascular instabilities are common in falciparum malaria, but can also be observed in vivax malaria.” A fatal case of imported malaria where the sole finding revealed at the postmortem evaluation was an acute lymphocytic myocarditis with myocardiolysis was described by Costenaro and colleagues.

In another example, Onwuamaegbu, Henein, and Coats reviewed the potential role of malaria in chronic and severe malaria and the connection to chronic heart failure. They concluded that, “Our review of the literature suggests that there are significant similarities in the cachexia seen in CHF and that of malaria, especially as related to the effects of muscle mass and immunology.” Clinical manifestations in P. falciparum malaria also include reduced cardiac output as was reported in an imported case of malaria by Johanna Herr and co-workers.

Marrelli and Brotto note that, “Sequestration of red blood cells, increased levels of serum creatine kinase and reduced muscle content of essential contractile proteins are some of the potential biomarkers of the damage levels of skeletal and cardiac muscles.” They explain that, “These biomarkers might be useful for prevention of complications and determining the effectiveness of interventions designed to protect cardiac and skeletal muscles from malaria-induced damage.”

Not just malaria as a disease is involved, but also the medicines used to treat it. Ngouesse and colleagues draw attention to antimalarial drugs with cardiovascular side effects. They draw particular attention to the dangers of halofantrine, quinine and quinidine, but also note mild and/or transient effects of other antimalarials.

Guidelines exist for proper and prompt malaria case management, especially protocols for caring for patients with severe malaria. These and the medicines required must be more readily available to front line health staff. And of course is we are more diligent in preventing malaria through long lasting insecticide-treated nets and other measures, our worries about severe malaria and CVD complications will reduce.

Severe malaria case management practices in selected states in Nigeria: Need for urgent intervention

Severe Malaria, Treatment

At the recently concluded American Society of Tropical Medicine and Hygiene 2014 Annual Meeting, USAID’s MAPS Project presented a poster on severe malaria in Nigeria. The authors, Yetunde Oke, Banji Ipadeola, Bolatito Aiyenigba, Grace Nwankwo, Justice Adaji, Olatunde Olotu, Aniefiok Akpasa, and Abba Umar, share their findings below.

maps logoSevere malaria is a life threatening medical condition that requires emergency interventions including prompt and effective treatment to prevent death (WHO 2000). The AQUAMAT* study showed a relative reduction in mortality of 22.5% with use of parenteral artesunate compared to quinine in the management of severe P. falciparum malaria and the Nigeria national policy on malaria diagnosis and treatment has been revised based on this evidence.

However, implementation of this guideline is still a challenge. The goal of this study was to determine baseline capacity and management practices for severe malaria in selected secondary health facilities in Nigeria with the aim of designing interventions to address specific gaps identified.

A cross?sectional study was conducted to assess twenty?four secondary public health facilities in three states (Benue, Kogi and Oyo States) in Nigeria in August 2013. Data on the capacity of health care providers; malaria services provided at different service delivery points (three months preceding the survey).

Medical supplies were collected using modified WHO severe malaria assessment tools. Data  entry was done  using the SPSS software programme and analysis done with STATA version 10.0.

Prev Severe MalTotal number of confirmed malaria cases reported in the three states over the three months preceding the assessment was 18, 695 and diagnosis of severe malaria was made in 8.6% of the total malaria cases. Out of the severe malaria cases, 75.9% were discharged, 3.8% referred and 1.5% died.

Fifty per cent of the health care providers had attended training on malaria case management 12 months preceding the survey. The majority of providers managed severe malaria with injectable artemether (45.8%), quinine (37.5%) compared with artesunate (29.2%).

Routine antimalarialsMost of the health facilities (95.8%) practiced parasite-based diagnosis of malaria but only (29.2%) monitored the parasite clearance of patients with severe malaria. 70% of the facilities did not have basic supplies for ancillary management of severe malaria. 66.7% and 30% of the health facilities experienced stock?out of parenteral artesunate and parenteral  quinine respectively  in the previous three months.

Health system strengthening with emphasis on capacity building of health care providers, medical commodity security and improvement in supportive/ancillary management of severe malaria is needed to reduce the mortality attributable to severe malaria.

Sunday Symposium #176 at TropMed2013 Malaria: Biology and Pathogenesis – Human Responses to falciparum

Plasmodium/Parasite, Severe Malaria

AnnualMeetinggraphicOn this final day of the American Society of Tropical Medicine and Hygiene’s 62nd Annual Conference, there is a featured symposium on Malaria: Biology and Pathogenesis – Human Responses to falciparum. Presentations are listed below with links to the abstracts online.

Demonstration of enhanced strain-specific Plasmodium falciparum multifunctional T cell cytokine expression among Malian children immunized with the FMP2.1/AS02A vaccine by Shawna F. Graves et al.

The Study suggests that AMA1 vaccination induced an AMA1-specific CD4+ response; however, recognition of the vaccine antigen is not dependent upon c1L alone. In summary, AMA1-specific T cell cytokine expression was notably increased in children vaccinated with an AMA1-based vaccine compared to rabies. The possible role of CD4+ TNF-?+IL-2+-expressing T cells in vaccine-induced strain-specific protection against clinical malaria requires further exploration.

Fatal Pediatric Cerebral Malaria is Associated with Intravascular Inflammation and Coagulation that is Exacerbated by HIV-1 Co-infection by Sarah Hochman and colleagues.

We hypothesize that the intravascular inflammation and coagulation seen in CM autopsies contribute to the pathogenesis of pediatric CM and that dysregulation of these processes in HIV infection contribute to CM mortality.

Immune responses of rhesus monkeys to a self-assembling protein nanoparticle (SAPN) vaccine displaying Plasmodium falciparum CSP B- and T-cell epitopes by David E. Lanar and co-researchers.

We have previously studied in mice the immune responses induced against Plasmodium falciparum circumsporozoite protein (PfCSP) epitopes using a self-assembling protein nanoparticle (SAPN) platform. In conclusion, a PfCSP-KMY-SAPN vaccine for malaria was safe and immunogenic in rhesus monkeys. Immune responses to the vaccine were greatly enhanced if the nanoparticle was formulated with the adjuvant GLA-SE.

Non-invasive Pulse Oximetry to Predict Mortality in African Children with Malaria by Andrea L. Conroy et al.

The mortality rate for children admitted with malaria was 3.1%. We evaluated whether non-invasive pulse oximetry would predict disease outcome in malaria and compared the findings to venous lactate, an established prognostic marker in malaria. These data suggest that pulse oximetry alongside assessment of venous lactate may be useful in the triage and treatment of children with severe malaria. Additional advantages in pulse oximetry are low operating costs and real-time patient monitoring.

Placental malaria induces excessive vasculogenesis by  Tara C. Bracken and colleagues.

Placental malaria (PM) results from sequestration of Plasmdium falciparum-infected erythrocytes and the resulting inflammatory responses in the maternal placental blood space. PM induces maternal anemia, preterm birth, low birth weight, or stillbirth, especially in primigravidae. The active/active chronic group had a significantly higher percentage of excessive vasculogenesis.

Retinal microvascular dysfunction in pediatric cerebral malaria is associated with death and neurological sequelae by Ian J. MacCormick and co-authors.

Our results suggest that central nervous system ischemia and leakage across blood-tissue barriers may be important contributors to the severity of pediatric Cerebral Malaria.

Are non-communicable diseases actually communicable?

Chronic/NCDs, Epidemiology, Mortality, Severe Malaria

Much of the discussion around global health and post-Millennium Development Goals focuses on non-communicable diseases (NCDs) including cardiovascular problems, diabetes, cancers and the the like.  While it is important to recognize that low income nations are not plagued with both communicable and non-communicable diseases, we do not want the greater focus on NCDs in richer countries to overshadow the problems of malaria, pneumonia, TB, diarrhea and other child killers in poorer countries.

dscn7742-chw-flipchart.jpgA major reason for us not to lose focus on communicable diseases was recently reported from the Wellcome Trust on research they have supported in Malawi. The researchers found that the malaria parasite, Plasmodium falciparum, is able to “cause inflammation in blood vessel walls, making them more sticky so that the infected red blood cells can cling to the sides. Being able to stick to the blood vessels in vital organs allows the parasite to hide away from the immune system, a process called sequestration. When it occurs in the brain it causes a more severe form of the disease called cerebral malaria, associated with seizures, coma and sometimes death.”

The researchers also surmised that if this complication does not kill people in childhood, the damage to blood vessel walls can have more long lasting effects. In particular they noted that, “Chronic changes to the blood vessels like these could an important contributing factor to cardiovascular disease later in life.”

The link between malaria and Endemic Burkitt lymphoma (eBL) continues to be explored. Recently adding to this long history of eBL research, Peter Aka and colleagues reported that. “Anti–HRP-II (Plasmodium falciparum histidine-rich protein-II) antibodies suggest that recent malaria infection triggers the onset of eBL.”

In a review of intrauterine growth retardation (IUGR) Demicheva and Crispi observed that, “Several clinical and experimental studies showed that IUGR fetuses present signs of cardiac dysfunction in utero that persist postnatally and may condition higher cardiovascular risk later in life.” In endemic regions, malaria in pregnancy is a major cause of IUGR and thus low birth weight.

Preventing malaria therefore saves lives now and in the future. Ignoring malaria now adds greater burdens to the health system and national productivity tomorrow. We need to maintain our investments in malaria both globally and in and by endemic countries themselves.

Disabilities – the role of malaria

Severe Malaria

sotwc-2013-unicef_reports_reportcover_ena.jpgUNICEF’s 2013 State of the World’s Children focuses on “Children with Disabilities.”  Some attention is paid to the role of communicable or infectious disease in the cause of disabilities and the need for children with disabilities to benefit from disease control services, just like any other child.

Of particular focus in the realm of infectious disease is recognition that, “… immunization is an important means of pre-empting diseases that lead to disabilities.” The Report goes on to explain for example, that, “More children than ever before are being reached. One consequence has been that the incidence of polio – which can lead to permanent muscle paralysis – fell from more than 350,000 cases in 1988 to 221 cases in 2012.”

Malaria as an infectious disease continues to exert a disabling effect on children in endemic countries. The Report does present a case study of children who spent several years in a residential home for children with mental disabilities in the Republic of Moldova, but it is also important to recognize that malaria and other infectious diseases can lead to such problems.

In reporting on neurological disease in Sub-Saharan Africa, Donald Silberberg and Elly Katabira explained that, “In addition to the hundreds of thousands of children who die each year from cerebral malaria, many more survive (often repeated attacks) and develop sequelae that have yet to be quantified. These include cognitive disorders and epilepsy.”

Likewise Ngoungou and colleagues after studying children with cerebral malaria in Mali found persistent neurological sequelae including, “ headaches, mental retardation, speech delay, bucco-facial dyspraxia, diplegia and frontal syndrome (one case each), dystonia (two cases), epilepsy (five cases) and behavior and attention disorders (15 cases).”

Immunization is of course a major tool in preventing disability, but we also need to examine the role other disease control efforts can play on preventing disability. Also as mentioned in the case of immunization above, we also need to ensure that all children with any kind of disability in a malaria endemic area promptly receive all necessary treatment and preventive interventions.

Epilepsy – a long term consequence of severe malaria

Severe Malaria

When calculating the burden of malaria, we often forget the longer term disabilities that persist after an acute episode. Specifically, Kariuki and co-researchers highlight that, “Falciparum malaria is an important cause of acute symptomatic seizures in children admitted to hospitals in sub-Saharan Africa, and these seizures are associated with neurological disabilities and epilepsy.”
In a new review in Neurology, Ngugi and colleagues report that …

“Our estimates suggest that the incidence of epilepsy in LMIC (low and middle income countries) is approximately twice that of HIC (high income countries) … The cause of the higher incidence in resource-poor compared to industrialized countries is likely to be multifactorial. The higher incidence of head trauma and of infections and infestations of the CNS (central nervous system) such as malaria, neurocysticercosis, and invasive bacterial infections may be important causes.”

dscn9102sm.jpgPreventing malaria or treating malaria in a very timely manner is a crucial step in reducing the long term burden of disease in individuals and countries. Kariuki et al. note a challenge: “… it is difficult to determine the proportion of seizures attributable to malaria in endemic areas since a significant proportion of asymptomatic children have malaria parasitaemia.”

Kenya has been experiencing some intense malaria intervention over recent years.  This provides a setting where researchers have gotten a handle on the potential reduction in the burden of long term CNS disease because of malaria control activities. Among the findings Kariuki et al. report are that, “From 2002 to 2008, the incidence of all acute symptomatic seizures decreased by … 69.2% with 93.1% of this decrease in malaria-associated seizures.”

Malaria itself imposes major immediate costs on a community from direct service payments and indirect loss of work and of course from loss of life. We should not forget the lingering costs of severe malaria may degrade the educational and occupational capacity and opportunities of community members, leaving such endemic communities mired in poverty. Clearly malaria elimination is an essential contribution to national development.