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Abdala, technical nameCIGB-66, is aCOVID-19 vaccine developed by theCenter for Genetic Engineering and Biotechnology inCuba.[2] This candidate, named after a patriotic drama by Cuban independence heroJosé Martí, is aprotein subunit vaccine containing COVID-derived proteins that trigger an immune response.[3] The full results of the clinical trial have not yet been published. This candidate followed a previous one called CIGB-669 (MAMBISA).[4]
The vaccine is one of two Cuba-developedCOVID-19 vaccines which has passedPhase III trials,[5][6][7] and has received emergency authorisation.
On 22 June 2021, official Cuban government sources reported that the results of an initial study by the Cuban Center for Genetic Engineering and Biotechnology involving 48,290 participants found a 92.28% efficacy rate[9][10][11][12] at preventing symptomatic COVID-19.[13][14] The report included aconfidence interval of85.74%–95.817% without a specifiedconfidence level; analysis was based on 153 cases of symptomatic COVID, 142 of which were in the placebo group and 11 of which were in the approximately equal vaccinated group.[14]
The measure of efficacy includes the initial strain ofSARS-COV-2 as well as variants that were present in Cuba during the study,[15] includingAlpha,Beta, andGamma strains.[13] TheBeta variant entered Cuba in January 2021 and became the predominant strain in Cuba,[16][17][18] fuelling a rise in COVID cases.[19]
As of 28 June 2021, Cuba has not yet released detailed information about the vaccine to theWHO[12] or to thegeneral public via apre-print or ascientific article.[20] It is planned to do so after the Cuba Health Agency (CECMED) authorises the vaccine for emergency use.[14][21]
In September 2022, a study published inThe Lancet Regional Health – Americas[22] reported that the estimated vaccine effectiveness against severe illness was 93.3% in partially vaccinated individuals and 98.2% in those fully vaccinated; effectiveness against death was 94.1% and 98.7%, respectively. Effectiveness exceeded 92.0% across all age groups. The retrospective, real-world study was conducted during theDelta variant wave in Cuba, and the effectiveness againstOmicron or subsequent variants remains unknown.
The vaccine was designed by researchers from theCenter for Genetic Engineering and Biotechnology and has been described in a pre-print submission.[23] The Abdala vaccine reportedly consists of a monomericreceptor binding domain subunit, residues 331-530 of the Spike protein of SARS-CoV-2 strain 156 Wuhan-Hu-1, expressed in the yeastPichia pastoris at 30–40 mg/L fermentation yield.[23] The vaccine antigen ispolyhistidine-tagged to aid purification and is reportedly purified viaimmobilised metal affinity chromatography and subsequent hydrophobic interaction chromatography to >98% purity.[23] For animal studies 50 μg of vaccine antigen per dose was adjuvanted with 0.3 mg aluminium hydroxide gel (Alhydrogel) and delivered in 500 μL phosphate buffer.[23]
Venezuela claimed that it would manufacture the vaccine[24] but, as of 2 May 2021, the claim had not yet materialised.[25] State-owned EspromedBIO will manufacture the vaccine but some "arrangements" are needed to start production.[26] In April,Nicolás Maduro said that a capacity of 2 million doses per month is hoped to be reached by August or September 2021.[27] In June 2021,Vietnam's Ministry of Health announced that negotiations were ongoing between Cuba and Vietnam for Abdala vaccine production. The Institute of Vaccines and Medical Biologicals (IVAC) was named as the focal point for receiving technology transfer.[28]
In July 2020, Abdala commenced phase I/II clinical trials.[29]
The Phase III trial compares 3 doses of the vaccine administered at 0, 14 and 28 days against aplacebo, with the primary outcome measuring the proportion of cases reported for each group 14 days after the third dose. The trial was registered on 18 March 2021. The first dose was administered on 22 March and by April 4, the 48,000 participants had received their first dose,[30][31] and second doses started being administered from April 5.[32][better source needed] Third doses have started being administered on 19 April[33][34][35] and on May 1, adherence to the three-dose protocol was over 97%.[36]
In July 2021, Abdala started clinical trial phase I/II for children and adolescents aged 3-18.[37]
124,000 people aged 19 to 80 received 3 doses of the vaccine as part of an intervention study, with the primary outcome measuring the proportion of cases and deaths for the vaccinated compared to the unvaccinated population.[38]
A wider intervention study with the 1.7 million inhabitants of Havana is expected to start in May with the Abdala andSoberana 2 vaccine.[39]
On 9 July 2021, Abdala was approved for emergency use in Cuba.[40][41]
On 18 September 2021, Abdala was approved for emergency use in Vietnam.[42]
On 16 December 2021, the Ministry of Health of Saint Vincent and the Grenadines announced that the Abdala vaccine was available at vaccination sites across the island.[43] This announcement follows a donation of vaccines made by the Cuban government on 13 December 2021.[44]
On 29 December 2021, Abdala was approved for emergency use in Mexico.[45]
On 24 June 2021,Vice President of VenezuelaDelcy Rodríguez announced that Venezuela had signed a contract for 12 million doses of the vaccine, and that these doses are to arrive in "the coming months".[46] The first shipment of Abdala arrived in Venezuela the day following this announcement.[47]
On 20 September, 2021, The Vietnamese Government has issued a resolution on purchase of 10 million doses of Abdala COVID-19 vaccine.[48]
^abcdLimonta-Fernández M (2021). "The SARS-CoV-2 receptor-binding domain expressed in Pichia pastoris as a candidate vaccine antigen July 3, 2021".medRxiv10.1101/2021.06.29.21259605v1.
^"Venezuela to produce Cuban COVID vaccine: Maduro".Aljazeera.com. Al Jazeera and news agencies. 12 April 2021. Retrieved23 June 2021.We've signed an agreement to produce in our laboratories... two million vaccines a month of the Abdala vaccine... for August, September, approximately,
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