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malaria vaccine

Proteome-wide analysis of a malaria vaccine study reveals personalized humoral immune profiles in Tanzanian adults

July 15, 2020 - 14:17 -- Open Access
Author(s): 
Camponovo F, Campo JJ, Penny MA, et al.
Reference: 
Elife. 2020 Jul 14; 9:e53080

Tanzanian adult male volunteers were immunized by direct venous inoculation with radiation-attenuated, aseptic, purified, cryopreserved Plasmodium falciparum (Pf) sporozoites (PfSPZ Vaccine) and protective efficacy assessed by homologous controlled human malaria infection (CHMI). Serum immunoglobulin G (IgG) responses were analyzed longitudinally using a Pf protein microarray covering 91% of the proteome, providing first insights into naturally acquired and PfSPZ Vaccine-induced whole parasite antibody profiles in malaria pre-exposed Africans.

Genetic polymorphism of Plasmodium falciparum circumsporozoite protein on Bioko Island, Equatorial Guinea and global comparative analysis

July 14, 2020 - 09:34 -- Open Access
Author(s): 
Hui-Ying Huang, Xue-Yan Liang, Min Lin, et al.
Reference: 
Malaria Journal 2020 19:245, 13 July 2020

Plasmodium falciparum circumsporozoite protein (PfCSP) is a potential malaria vaccine candidate, but various polymorphisms of the pfcsp gene among global P. falciparum population become the major barrier to the effectiveness of vaccines. This study aimed to investigate the genetic polymorphisms and natural selection of pfcsp in Bioko and the comparison among global P. falciparum population.

The thermostability of the RTS,S/AS01 malaria vaccine can be increased by co-lyophilizing RTS,S and AS01

June 9, 2020 - 16:05 -- Open Access
Author(s): 
Juliette Fortpied, Sylvie Collignon, Nicolas Moniotte, Frédéric Renaud, Babak Bayat and Dominique Lemoine
Reference: 
Malaria Journal 2020 19:202, 8 June 2020

Developing thermostable vaccines is a challenge for pharmaceutical companies due to the inherent instability of biological molecules in aqueous solution. The problem is even more stringent in regions subjected to high temperatures in which protective cold chain is difficult to maintain due to a lack of infrastructure. Here, a simple, cost-effective solution to increase the thermostability of the malaria candidate vaccine RTS,S/AS01 is described. This vaccine currently needs to be stored between 2 and 8  °C due to the sensitivity of liquid AS01 to higher temperatures. The strategy was to increase thermostability by co-lyophilizing the RTS,S antigen and AS01.

The Equatoguinean Malaria Vaccine Initiative: From the Launching of a Clinical Research Platform to Malaria Elimination Planning in Central West Africa

May 29, 2020 - 14:27 -- Open Access
Author(s): 
Billingsley PF, Maas CD, Ayekaba MO, et al.
Reference: 
Am J Trop Med Hyg. 2020 May 26

Fifteen years of investment in malaria control on Bioko Island, Equatorial Guinea (EG), dramatically reduced malaria-associated morbidity and mortality, but the impact has plateaued. To progress toward elimination, EG is investing in the development of a malaria vaccine. We assessed the unique public–private partnership that has had such a significant impact on malaria on Bioko Island and now added a major effort on malaria vaccine development.

A double-blind, placebo-controlled phase 1/2a trial of the genetically attenuated malaria vaccine PfSPZ-GA1

May 25, 2020 - 07:31 -- Open Access
Author(s): 
Roestenberg M, Walk J, Sauerwein RW, et al.
Reference: 
Science Translational Medicine, 20 May 2020, Vol. 12, Issue 544, eaaz5629

Immunization with attenuated Plasmodium sporozoites can induce protection against malaria infection, as shown by Plasmodium falciparum (Pf) sporozoites attenuated by radiation in multiple clinical trials. As alternative attenuation strategy with a more homogeneous population of Pf sporozoites (PfSPZ), genetically engineered Plasmodium berghei sporozoites (SPZ) lacking the genes b9 and slarp induced sterile protection against malaria in mice. Consequently, PfSPZ-GA1 Vaccine, a Pf identical double knockout (Pf∆b9∆slarp), was generated as a genetically attenuated malaria parasite vaccine and tested for safety, immunogenicity, and preliminary efficacy in malaria-naïve Dutch volunteers.

NOT Open Access | Case reduction and cost-effectiveness of the RTS,S/AS01 malaria vaccine alongside bed nets in Lilongwe, Malawi

May 6, 2020 - 15:39 -- NOT Open Access
Author(s): 
Bell GJ, Loop M, Emch M, et al.
Reference: 
Vaccine. 2020 Apr 30. pii: S0264-410X(20)30511-9

RTS,S/AS01, the most advanced vaccine against malaria, is now undergoing pilot implementation in Malawi, Ghana, and Kenya where an estimated 360,000 children will be vaccinated each year. In this study we evaluate RTS,S/AS01 alongside bed net use and estimate cost-effectiveness.

Multi-functional antibodies are induced by the RTS,S malaria vaccine and associated with protection in a phase I/IIa trial

April 6, 2020 - 15:34 -- Open Access
Author(s): 
Kurtovic L, Atre T, Beeson JG, et al.
Reference: 
J Infect Dis. 2020 Mar 31. pii: jiaa144

RTS,S is the leading malaria vaccine candidate, but only confers partial efficacy against malaria in children. RTS,S is based on the major Plasmodium falciparum sporozoite surface antigen, circumsporozoite protein (CSP). The induction of anti-CSP antibodies is important for protection, however, it is unclear how these protective antibodies function.

NOT Open Access | Immunogenicity and safety of the RTS,S/AS01 malaria vaccine co-administered with measles, rubella and yellow fever vaccines in Ghanaian children: A phase IIIb, multi-center, non-inferiority, randomized, open, controlled trial

March 23, 2020 - 14:50 -- NOT Open Access
Author(s): 
Asante KP, Ansong D, Ofori-Anyinam O, et al.
Reference: 
Vaccine. 2020 Mar 16. pii: S0264-410X(20)30358-3

To optimize vaccine implementation visits for young children, it could be efficient to administer the first RTS,S/AS01 malaria vaccine dose during the Expanded Programme on Immunization (EPI) visit at 6 months of age together with Vitamin A supplementation and the third RTS,S/AS01 dose on the same day as yellow fever (YF), measles and rubella vaccines at 9 months of age. We evaluated the safety and immunogenicity of RTS,S/AS01 when co-administered with YF and combined measles-rubella (MR) vaccines.

Long-term immunogenicity and immune memory response to the hepatitis B antigen in the RTS,S/AS01E malaria vaccine in African children: a randomized trial

January 24, 2020 - 15:04 -- Open Access
Author(s): 
Valéa I, Adjei S, Agbenyega T, et al.
Reference: 
Hum Vaccin Immunother. 2020 Jan 17:1-7

RTS,S/AS01E malaria vaccine contains the hepatitis B virus surface antigen and may thus serve as a potential hepatitis B vaccine. To evaluate the impact of RTS,S/AS01E when implemented in the Expanded Program of Immunization, infants 8–12 weeks old were randomized to receive either RTS,S/AS01E or a licensed hepatitis B control vaccine (HepB), both co-administered with various combinations of the following childhood vaccines: diphtheria-tetanus-acellular pertussis-Haemophilus influenzae type b, trivalent oral poliovirus, pneumococcal non-typeable Haemophilus influenzae protein D conjugate and human rotavirus vaccine.

Exploring the Use of a General Equilibrium Method to Assess the Value of a Malaria Vaccine: An Application to Ghana

January 14, 2020 - 16:37 -- Open Access
Author(s): 
Yerushalmi E, Hunt P, Hoorens S, Sauboin C, Smith R
Reference: 
MDM Policy & Practice, 2019 Dec 19;4(2):2381468319894345

Malaria is an important health and economic burden in sub-Saharan Africa. Conventional economic evaluations typically consider only direct costs to the health care system and government budgets. This paper quantifies the potential impact of malaria vaccination on the wider economy, using Ghana as an example.

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