Reggis Katsande

Dr. Reggis Katsande


Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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22 August 2024 in Vaccines
Verified
Journal Article
Open access
PDF file
BMBalcha Masresha
Balcha Masresha
CWCharles Shey Wiysonge
Charles Shey Wiysonge
RKReggis Katsande
Reggis Katsande
POPatrick O'Connor
Patrick O'Connor
ELEmmaculate Lebo
Emmaculate Lebo
RPRobert Perry
Robert Perry
Measles or rubella elimination is verified when endemic transmission of the corresponding virus has been absent for over 36 months in a defined area, in the presence of a well-performing surveillance system. This report updates the progress by 47 countries in the WHO African Region towards the goal of attaining verification of measles and rubella elimination in at least 80% of the countries of the region by 2030. We reviewed the WHO-UNICEF vaccination coverage estimates for the first and second doses of measles- and measles-rubella-containing vaccines, as well as the available coverage data for measles supplementary immunization activities, during 2022–2023. We also reviewed the measles-surveillance performance and analyzed the epidemiological trends of measles and rubella as reported in the case-based surveillance database. The WHO-UNICEF estimates of first measles vaccine dose (MCV1) and second measles vaccine dose (MCV2) coverage for the African Region for 2022 were 69% and 45%, respectively. Rubella-containing vaccines have been introduced in the routine immunization program in 32 of 47 (68%) countries as of the end of 2022, with no introductions during 2023. In 2022 and 2023, a total of 144,767,764 children were vaccinated in the region with measles or MR vaccines in 24 countries through 32 mass vaccination campaigns. The administrative coverage target of 95% was reached in only 15 (49%) of the 32 vaccination campaigns. In 2023, a total of 125,957 suspected cases of measles were reported through the case-based surveillance system, and 73,625 cases (58%) were confirmed to be measles, either by laboratory testing, by epidemiological linkage, or based on clinical compatibility. A total of 4805 confirmed rubella cases were reported, though this total represents substantial under-ascertainment. The regional incidence of measles was 60.3 cases per million population. Twenty-six countries (55%) met the targets for the two principal surveillance system performance-monitoring indicators. No country in the region has attained the verification of measles or rubella elimination as of the end of 2023. Addressing systemic problems with routine immunization and using tailored approaches to reach unvaccinated children can contribute to progress towards measles and rubella elimination. In addition, periodic and timely high-quality preventive SIAs remain a critical programmatic strategy to reach unvaccinated children.

26 April 2026 in Vaccines
Verified
Journal Article
Open access
PDF file
CWCharles Shey Wiysonge
Charles Shey Wiysonge
Abdu AdamuAbdu Adamu
Abdu Adamu
ABAdo Mpia BWAKA
Ado Mpia BWAKA
CWConstance Ning Wiysonge
Constance Ning Wiysonge
JTJohnson M. Ticha
Johnson M. Ticha
BMBalcha Masresha
Balcha Masresha
Background: The end of the COVID-19 public health emergency of international concern (PHEIC) in May 2023 marked a transition from disruption to recovery and rebuilding of health systems. The WHO African Region entered this period with declining routine immunization coverage, widening inequities, and fragile surveillance systems. We conducted a critical narrative synthesis of post-PHEIC recovery and the transformation of immunization systems in the region from 2023 to 2025. Methods: We thematically analyzed publicly available data from the WHO and other sources using a systems-oriented framework covering immunization coverage, equity, vaccine introductions, disease control, governance, financing, and data systems. Results: Regional coverage for most antigens was restored to 2019 pre-pandemic levels by 2024, e.g., three doses of diphtheria-tetanus-pertussis-containing vaccines at 76%. However, progress remains insufficient to meet the Immunization Agenda 2030 (IA2030) target of 90% coverage. In addition, there were 6.7 million zero-dose children in the 2024 birth cohort (6.3% higher than the 6.3 million in 2019), concentrated in a few countries. The IA2030 target is a 50% reduction in the number of zero-dose children by 2030, compared to 2019. Recovery initiatives have restored services, while accelerated introductions (e.g., malaria vaccines introduced in 20 new countries in 2024–2025) signal renewed system momentum. Yet, progress has plateaued at pre-pandemic levels, reflecting structural constraints rather than sustained transformation. Concurrently, recurrent outbreaks of measles, yellow fever, and other vaccine-preventable diseases highlight persistent immunity gaps and surveillance limitations. Structural constraints (including financing fragility, subnational inequities, and system fragmentation) continue to limit sustained progress. Conclusion: This study offers important insights that can inform immunization policymaking in the WHO African Region and beyond. Current post-PHEIC trends reflect recovery without transformation. Achieving IA2030 targets will require a shift from broad coverage expansion to precision delivery approaches that prioritize zero-dose and underserved populations. Immunization must be positioned as a central pillar of primary health care and health security systems.

4 November 2025 in Research Square
Verified
Preprint
Open access
PDF file
ANAquino Nhamtumbo
Aquino Nhamtumbo
LGLinda Maria De Gouveia
Linda Maria De Gouveia
Goitom Gebremedhin Gebremedhin WeldegebrielGoitom Gebremedhin Gebremedhin Weldegebriel
Goitom Gebremedhin Gebremedhin Weldegebriel
CFCarlos Abel Funzamo
Carlos Abel Funzamo
AMAlzira Mabote
Alzira Mabote
IFIvano de Filippis
Ivano de Filippis
Background In Mozambique, the introduction of a 13-valent pneumococcal conjugate vaccine (PCV13) using a two plus one schedule began in September 2019. However, the replacement of serotypes with non-PCV types remains a concern worldwide following widespread vaccination. We aim to describe the epidemiology of non-PCV13 types among children under 5 years of age with pneumococcal meningitis four years after PCV13 introduction in Mozambique. Methods Between January 2020 and December 2023, a total of 2,014 cerebrospinal fluid (CSF) samples were collected from eligible children as part of the meningitis surveillance system in Mozambique, 103 (5.1%) of which tested positive for S. pneumoniae after triplex qPCR. Among these, 86 (83.5%) samples met the quality criteria for serotyping and were subsequently analysed using sequential quadriplex qPCR. Results Among children under 2 years of age, 84.8% of the S. pneumoniae- positive samples belonged to non-PCV13 serotypes, with serotype 15B/C (31.0%) being the most prevalent, followed by 12F/12A/12B/44/46 (12.1%), 38B (10.6%), and 8 (7.6%). Serotypes 15B/C, 12F/12A/12B/44/46, 38, 8, and 1 were predominant in the northern region of the country (Nampula), whereas serotypes 15B/C and 12F/12A/12B/44/46 were most common in the central region (Sofala). The serotypes coverage of the PCV13, PCV15 and PCV20 vaccine formulations were 20.0%, 26.3% and 75.8%, respectively. Conclusion PCV13 vaccines save many lives in Mozambique. However, they do not seem to be adequate in addresing some of the highly prevailing non-PCV13 serotypes (15B/C and 12F/12A/12B/44/46). Therefore, we suggest that the country's National Immunization Technical Advisory Group (NITAG) review new data and advice on switching to extended valency vaccines such as PCV20.

15 December 2025 in Vaccines
Verified
Journal Article
Open access
PDF file
ANAquino Nhamtumbo
Aquino Nhamtumbo
Goitom Gebremedhin Gebremedhin WeldegebrielGoitom Gebremedhin Gebremedhin Weldegebriel
Goitom Gebremedhin Gebremedhin Weldegebriel
LGLinda Maria De Gouveia
Linda Maria De Gouveia
RKReggis Katsande
Reggis Katsande
CCCharlotte Elizabeth Comé
Charlotte Elizabeth Comé
EGEduardo Samo Gudo
Eduardo Samo Gudo
Background: Mozambique introduced the 10-valent pneumococcal conjugate vaccine (PCV10) in 2013 using a three-dose primary series with no booster dose (3p+0) and later switched to the PCV13 using a schedule of two primary doses with one booster (2p+1). We aimed to describe the burden and serotype distribution of pneumococcal meningitis in children under 5 years of age in Mozambique over an eleven-year period starting with the year of PCV10 introduction, and assess the impact of the PCV vaccine and schedule changes. Methods: We analysed meningitis surveillance data in Mozambique from March 2013 through to December 2023. Cerebrospinal fluid (CSF) samples were collected from eligible children in three referral hospitals (Maputo Central Hospital [south], Beira Central Hospital [central], and Nampula Central Hospital [north]). Culture and polymerase chain reaction assay (qPCR) were performed on each sample. S. pneumoniae-positive samples were subsequently serotyped using multiplex assay. We estimated annual incidence rates for pneumococcal meningitis in children under 5 years old following the PCVs’ introduction (2013–2023). The impact of the product switch and schedule change from PCV10/3p+0 to PCV13/2p+1 on the burden and serotype distribution of pneumococcal meningitis was assessed. Results: Of the 4075 CSF samples tested, 7.4% (301/4075) were positive for S. pneumoniae, 2.5% (103/4075) for H. influenzae, and 1.0% (42/4075) for N. meningitidis. Pneumococcal meningitis incidence in children under five reduced from 44.7 cases per 100,000 in 2013 to 4.6 cases per 100,000 in 2023, an 89.7% reduction. In the PCV13/2p+1 period (2020–2023), pneumococcal meningitis incidence was 51.2% lower than the PCV10/3p+0 period (2013–2017) (IRR 0.49, 95% CI 0.4–0.6; p < 0.001). PCV10-serotype pneumococcal meningitis incidence among children under five decreased by 65.6% in the PCV13/2p+1 period (IRR 0.34, 95% CI 0.2–0.6; p < 0.001). We detected zero cases of pneumococcal meningitis due to the PCV13-serotype in 2020–2023, whereas non-PCV10/13-serotypes increased by 76% (IRR 1.76, 95% CI 1.2–2.6; p = 0.004). The case–fatality proportion decreased by 71.9% (95% CI 62.9–84.8%) in the PCV13/2p+1 period. Conclusions: Since the introduction of PCVs in Mozambique, the burden of pneumococcal meningitis and deaths in children under 5 years of age has substantially decreased, as well as the prevalence of PCV13-serotypes. Higher valency PCVs are needed due to the increased prevalence of non-PCV10/13-serotypes. Funding: Gavi, The Vaccine Alliance, reference number: MOZ-HSS-2-INS; WHO Reference: 2014405143-0, creation DFC to support HIB & Surveillance System.

24 March 2026 in Preprints.org
Verified
Preprint
Open access
PDF file
CWCharles Shey Wiysonge
Charles Shey Wiysonge
Abdu AdamuAbdu Adamu
Abdu Adamu
ABAdo Mpia BWAKA
Ado Mpia BWAKA
CWConstance Ning Wiysonge
Constance Ning Wiysonge
JTJohnson M Ticha
Johnson M Ticha
BMBalcha Masresha
Balcha Masresha
The end of the COVID-19 pandemic in May 2023 marked a pivotal transition from emergency response to recovery and rebuilding of health systems across the world. The WHO African Region entered this period with declining routine immunization coverage, widening inequities, and fragile surveillance systems. This review critically synthesizes post-pandemic immunization and vaccine-preventable disease (VPD) trends using publicly available data. Regional coverage for most vaccine doses returned to 2019 pre-pandemic levels by 2024. However, 6.7 million zero-dose children remain concentrated in a small number of countries. Accelerated recovery efforts – including the Big Catch-Up initiative, policy normalization of catch-up vaccination, and strengthened social and behaviour change strategies – have mitigated further backsliding. Concurrently, accelerated disease control initiatives - targeting measles, yellow fever, tetanus, meningitis, and poliomyelitis - have highlighted both renewed momentum toward elimination and eradication, and persistent vulnerabilities driven by immunity gaps, climate shocks, urbanization, and conflict. The strongest marker of regained momentum has been accelerated introductions of vaccines against malaria (in 20 new countries), human papillomavirus (in 10 new countries), and other VPDs across the region. However, sustained progress will require institutionalizing catch-up vaccination, systematically using implementation research to strengthen subnational tailoring, enhancing integrated surveillance systems, and securing predictable domestic financing within the framework of the Immunization Agenda 2030.