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https://www.readbyqxmd.com/read/27929232/the-pretravel-consultation
#1
Christopher Sanford, Adam McConnell, Justin Osborn
Key components of the pretravel consultation include intake questions regarding the traveler's anticipated itinerary and medical history; immunizations; malaria prophylaxis; and personal protection measures against arthropod bites, traveler's diarrhea, and injury. Most vaccinations that are appropriate for international travelers are included in the routine domestic immunization schedule; only a few travel-specific vaccines must also be discussed. The most common vaccine-preventable illnesses in international travelers are influenza and hepatitis A...
October 15, 2016: American Family Physician
https://www.readbyqxmd.com/read/27913644/the-impact-of-established-immunoregulatory-networks-on-vaccine-efficacy-and-the-development-of-immunity-to-malaria
#2
REVIEW
Marcela Montes de Oca, Michael F Good, James S McCarthy, Christian R Engwerda
The development of vaccines to protect against parasites is difficult, in large part due to complex host-parasite interactions that have evolved over millennia. Parasitic factors such as antigenic variation and host factors such as age, transmission intensity, and genetic influences are all thought to contribute to the limited efficacy of parasite vaccines. A developing theme in field studies investigating antiparasitic immunity is the emergence, establishment, and maintenance of immunoregulatory networks that shape the immune responses to new infections, as well as vaccines, thereby influencing disease outcome...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27912985/immunogenicity-and-malaria-transmission-reducing-potency-of-pfs48-45-and-pfs25-encoded-by-dna-vaccines-administered-by-intramuscular-electroporation
#3
Dibyadyuti Datta, Geetha P Bansal, Dietlind L Gerloff, Barry Ellefsen, Drew Hannaman, Nirbhay Kumar
Pfs48/45 and Pfs25 are leading candidates for the development of Plasmodium falciparum transmission blocking vaccines (TBV). Expression of Pfs48/45 in the erythrocytic sexual stages and presentation to the immune system during infection in the human host also makes it ideal for natural boosting. However, it has been challenging to produce a fully folded, functionally active Pfs48/45, using various protein expression platforms. In this study, we demonstrate that full-length Pfs48/45 encoded by DNA plasmids is able to induce significant transmission reducing immune responses...
November 29, 2016: Vaccine
https://www.readbyqxmd.com/read/27911910/molecular-markers-of-radiation-induced-attenuation-in-intrahepatic-plasmodium-falciparum-parasites
#4
Miranda S Oakley, Nitin Verma, Hong Zheng, Vivek Anantharaman, Kazuyo Takeda, Yamei Gao, Timothy G Myers, Phuong Thao Pham, Babita Mahajan, Nirbhay Kumar, Davison Sangweme, Abhai K Tripathi, Godfree Mlambo, L Aravind, Sanjai Kumar
Experimental immunization with radiation attenuated sporozoites (RAS) and genetically attenuated sporozoites has proved to be a promising approach for malaria vaccine development. However, parasite biomarkers of growth attenuation and enhanced immune protection in response to radiation remain poorly understood. Here, we report on the effect of an attenuating dose of γ-irradiation (15 krad) on the Plasmodium falciparum sporozoite (PfSPZ) ultrastructure by electron microscopy, growth rate of liver stage P. falciparum in liver cell cultures, and genome-wide transcriptional profile of liver stage parasites by microarray...
2016: PloS One
https://www.readbyqxmd.com/read/27905974/dynamic-denominators-the-impact-of-seasonally-varying-population-numbers-on-disease-incidence-estimates
#5
Elisabeth Zu Erbach-Schoenberg, Victor A Alegana, Alessandro Sorichetta, Catherine Linard, Christoper Lourenço, Nick W Ruktanonchai, Bonita Graupe, Tomas J Bird, Carla Pezzulo, Amy Wesolowski, Andrew J Tatem
BACKGROUND: Reliable health metrics are crucial for accurately assessing disease burden and planning interventions. Many health indicators are measured through passive surveillance systems and are reliant on accurate estimates of denominators to transform case counts into incidence measures. These denominator estimates generally come from national censuses and use large area growth rates to estimate annual changes. Typically, they do not account for any seasonal fluctuations and thus assume a static denominator population...
October 12, 2016: Population Health Metrics
https://www.readbyqxmd.com/read/27903741/whole-killed-blood-stage-vaccine-induced-immunity-suppresses-the-development-of-malaria-parasites-in-mosquitoes
#6
Feng Zhu, Taiping Liu, Chenhao Zhao, Xiao Lu, Jian Zhang, Wenyue Xu
As a malaria transmission-blocking vaccine alone does not confer a direct benefit to the recipient, it is necessary to develop a vaccine that not only blocks malaria transmission but also protects vaccinated individuals. In this study we observed that a whole-killed blood-stage vaccine (WKV) not only conferred protection against the blood-stage challenge but also markedly inhibited the transmission of different strains of the malaria parasite. Although the parasitemia is much lower in WKV-immunized mice challenged with malaria parasites, the gametocytemia is comparable between control and immunized mice during the early stages of infection...
November 30, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27903593/respiratory-syncytial-virus-infection-detection-and-new-options-for-prevention-and-treatment
#7
REVIEW
Cameron Griffiths, Steven J Drews, David J Marchant
Respiratory syncytial virus (RSV) infection is a significant cause of hospitalization of children in North America and one of the leading causes of death of infants less than 1 year of age worldwide, second only to malaria. Despite its global impact on human health, there are relatively few therapeutic options available to prevent or treat RSV infection. Paradoxically, there is a very large volume of information that is constantly being refined on RSV replication, the mechanisms of RSV-induced pathology, and community transmission...
January 2017: Clinical Microbiology Reviews
https://www.readbyqxmd.com/read/27899329/plasmodium-vivax-vaccine-research-we-ve-only-just-begun
#8
REVIEW
Wai-Hong Tham, James G Beeson, Julian C Rayner
Plasmodium vivax parasites cause the majority of malaria cases outside Africa, and are increasingly being acknowledged as a cause of severe disease. The unique attributes of P. vivax biology, particularly the capacity of the dormant liver stage, the hypnozoite, to maintain blood-stage infections even in the absence of active transmission, make blood-stage vaccines particularly attractive for this species. However, P. vivax vaccine development remains resolutely in first gear, with only a single blood-stage candidate having been evaluated in any depth...
November 27, 2016: International Journal for Parasitology
https://www.readbyqxmd.com/read/27895131/the-p-falciparum-cell-traversal-protein-for-ookinetes-and-sporozoites-as-a-candidate-for-pre-erythrocytic-and-transmission-blocking-vaccines
#9
Diego A Espinosa, Joel Vega-Rodriguez, Yevel Flores-Garcia, Amy R Noe, Christian Muñoz, Russell Coleman, Torben Bruck, Keith Haney, Alex Stevens, Diane Retallack, Jeff Allen, Thomas S Vedvick, Christopher B Fox, Steven G Reed, Randall F Howard, Ahmed M Salman, Chris J Janse, Shahid M Khan, Fidel Zavala, Gabriel M Gutierrez
Recent studies have shown that immune responses against the Cell-Traversal Protein for Plasmodium Ookinetes and Sporozoites (CelTOS) can inhibit parasite infection. While these studies provide important evidence towards the development of vaccines targeting this protein, it remains unknown whether these responses could engage the P. falciparum CelTOS in vivo. Using a newly developed rodent malaria chimeric parasite expressing the P. falciparum CelTOS (PfCelTOS), we evaluated the protective effect of in vivo immune responses elicited by vaccination and assessed the neutralizing capacity of monoclonal antibodies specific against PfCelTOS...
November 28, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27893966/vaccination-via-chloroplast-genetics-affordable-protein-drugs-for-the-prevention-and-treatment-of-inherited-or-infectious-human-diseases
#10
Henry Daniell, Hui-Ting Chan, Elise K Pasoreck
Plastid-made biopharmaceuticals treat major metabolic or genetic disorders, including Alzheimer's, diabetes, hypertension, hemophilia, and retinopathy. Booster vaccines made in chloroplasts prevent global infectious diseases, such as tuberculosis, malaria, cholera, and polio, and biological threats, such as anthrax and plague. Recent advances in this field include commercial-scale production of human therapeutic proteins in FDA-approved cGMP facilities, development of tags to deliver protein drugs to targeted human cells or tissues, methods to deliver precise doses, and long-term stability of protein drugs at ambient temperature, maintaining their efficacy...
November 23, 2016: Annual Review of Genetics
https://www.readbyqxmd.com/read/27892847/international-adoption-from-ethiopia-an-overview-of-the-health-status-at-arrival-in-belgium
#11
Lydia Van Kesteren, Marek Wojciechowski
BACKGROUND: Ethiopia is a densely populated country with a fast growing economy. Still socioeconomic and health issues render many children parentless. One thousand and twenty eight Ethiopian children have been adopted in Belgium from September 2005 to September 2015. Little has been published about their health status at arrival. METHODS: Three hundred and fifteen children adopted from Ethiopia were clinically evaluated at the Institute of Tropical Medicine in Antwerp from 1 January 2008 until 31 December 2014...
November 28, 2016: Acta Clinica Belgica
https://www.readbyqxmd.com/read/27890694/cord-blood-igg-and-the-risk-of-severe-plasmodium-falciparum-malaria-in-the-first-year-of-life
#12
Linda M Murungi, Klara Sondén, Dennis Odera, Loureen B Oduor, Fatuma Guleid, Irene N Nkumama, Mark Otiende, David T Kangoye, Greg Fegan, Anna Färnert, Kevin Marsh, Faith H A Osier
Young infants are less susceptible to severe episodes of malaria but the targets and mechanisms of protection are not clear. Cord blood antibodies may play an important role in mediating protection but many studies have examined their association with the outcome of infection or non-severe malaria. Here, we investigated whether cord blood IgG to Plasmodium falciparum merozoite antigens and antibody-mediated effector functions were associated with reduced odds of developing severe malaria at different time points during the first year of life...
November 24, 2016: International Journal for Parasitology
https://www.readbyqxmd.com/read/27890400/country-specific-predictions-of-the-cost-effectiveness-of-malaria-vaccine-rts-s-as01-in-endemic-africa
#13
Katya Galactionova, Fabrizio Tediosi, Flavia Camponovo, Thomas A Smith, Peter W Gething, Melissa A Penny
BACKGROUND: RTS,S/AS01 is a safe and moderately efficacious vaccine considered for implementation in endemic Africa. Model predictions of impact and cost-effectiveness of this new intervention could aid in country adoption decisions. METHODS: The impact of RTS,S was assessed in 43 countries using an ensemble of models of Plasmodium falciparum epidemiology. Informed by the 32months follow-up data from the phase 3 trial, vaccine effectiveness was evaluated at country levels of malaria parasite prevalence, coverage of control interventions and immunization...
November 24, 2016: Vaccine
https://www.readbyqxmd.com/read/27886547/comprehensive-review-on-various-strategies-for-antimalarial-drug-discovery
#14
Mitali Mishra, Vikash K Mishra, Varsha Kashaw, Arun K Iyer, Sushil Kumar Kashaw
The resistance of malaria parasites to existing drugs carries on growing and progressively limiting our ability to manage this severe disease and finally lead to a massive global health burden. Till now, malaria control has relied upon the traditional quinoline, antifolate and artemisinin compounds. Very few new antimalarials were developed in the past 50 years. Among recent approaches, identification of novel chemotherapeutic targets, exploration of natural products with medicinal significance, covalent bitherapy having a dual mode of action into a single hybrid molecule and malaria vaccine development are explored heavily...
January 5, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27882990/malaria-vaccine-peatland-protection-and-a-string-of-satellites
#15
(no author information available yet)
No abstract text is available yet for this article.
November 23, 2016: Nature
https://www.readbyqxmd.com/read/27881488/an-opsonic-phagocytosis-assay-for-plasmodium-falciparum-sporozoites
#16
Ryan W J Steel, Brandon K Sack, Moriya Tsuji, Stefan H I Kappe
Plasmodium falciparum malaria remains the deadliest parasitic disease worldwide. Vaccines targeting the pre-erythrocytic sporozoite and liver stages have the potential to entirely prevent blood stage infection and disease, as well as onward transmission. Sporozoite surface and secreted proteins are leading candidates for inclusion in a pre-erythrocytic, antibody-based vaccine. Preclinical functional assays to identify humoral correlates of protection in vitro, and to validate novel sporozoite protein targets for inclusion in multi-subunit vaccines currently do not consider the interaction of sporozoite-targeting antibodies with other components of the immune system...
November 23, 2016: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/27879554/measles-and-rubella-seroprevalence-among-hiv-infected-and-uninfected-zambian-youth
#17
Catherine G Sutcliffe, Kelly Searle, Hellen K Matakala, Dip Biomed, Michelle Greenman, Kaitlin Rainwater-Lovett, Philip E Thuma, William J Moss
BACKGROUND: Measles and congenital rubella syndrome remain significant causes of morbidity and mortality despite available vaccines. HIV-infected youth may be at increased risk of measles because of greater waning immunity following vaccination. At a population level, they constitute a potentially large pool of susceptibles to measles and rubella. More data among HIV-infected youth in sub-Saharan Africa are needed to guide vaccination policy and control strategies. METHODS: This cross-sectional study was nested within two ongoing studies of malaria and HIV in Zambia...
November 22, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27872043/first-malaria-vaccine-to-be-tested-in-pilot-projects-who-announces
#18
Anne Gulland
No abstract text is available yet for this article.
November 21, 2016: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/27867517/protective-immunity-to-liver-stage-malaria
#19
REVIEW
Lauren E Holz, Daniel Fernandez-Ruiz, William R Heath
Despite decades of research and recent clinical trials, an efficacious long-lasting preventative vaccine for malaria remains elusive. This parasite infects mammals via mosquito bites, progressing through several stages including the relatively short asymptomatic liver stage followed by the more persistent cyclic blood stage, the latter of which is responsible for all disease symptoms. As the liver acts as a bottleneck to blood-stage infection, it represents a potential site for parasite and disease control...
October 2016: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/27866903/emerging-concepts-in-t-follicular-helper-cell-responses-to-malaria
#20
REVIEW
Diana S Hansen, Nyamekye Obeng-Adjei, Ann Ly, Lisa J Ioannidis, Peter D Crompton
Antibody responses to malaria and candidate malaria vaccines are short-lived in children, leaving them susceptible to repeated malaria episodes. Because T follicular helper (TFH) cells provide critical help to B cells to generate long-lived antibody responses, they have become the focus of recent studies of Plasmodium-infected mice and humans. The emerging data converge on common themes, namely, that malaria-induced TH1 cytokines are associated with the activation of (i) T-like memory TFH cells with impaired B cell helper function, and (ii) pre-TFH cells that acquire Th1-like features (T-bet expression, IFN-γ production), which impede their differentiation into fully functional TFH cells, thus resulting in germinal center dysfunction and suboptimal antibody responses...
November 17, 2016: International Journal for Parasitology
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