Ralf Clemens

Rio De Janeiro, RJ, Brazil

Last Updated: 09/26/2026

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Found 72 publications

A Novel Unadjuvanted Subunit Respiratory Syncytial Virus Prefusion F Vaccine Induces Potent and Differentiated Functional Immune Responses Compared to AS01-Adjuvanted Arexvy in Older Adults.

A Novel Unadjuvanted Subunit Respiratory Syncytial Virus Prefusion F Vaccine Induces Potent and Differentiated Functional Immune Responses Compared to AS01-Adjuvanted Arexvy in Older Adults.

Journal: Open forum infectious diseases

Published: July 01, 2025

Impact of the COVID-19 pandemic on the routine immunization system in Bangladesh.

Impact of the COVID-19 pandemic on the routine immunization system in Bangladesh.

Journal: PloS one

Published: June 03, 2025

Pandemic preparedness and response: a survey among experts from high- and low-middle-income countries about the "100 Days Mission".

Pandemic preparedness and response: a survey among experts from high- and low-middle-income countries about the "100 Days Mission".

Journal: Frontiers in public health

Published: April 23, 2025

Re-imagining combination vaccines for travel medicine.

Re-imagining combination vaccines for travel medicine.

Journal: Journal of travel medicine

Published: December 01, 2024

Indirect effectiveness of a novel SARS-COV-2 vaccine (SCB-2019) in unvaccinated household contacts in the Philippines: A cluster randomised analysis.

Indirect effectiveness of a novel SARS-COV-2 vaccine (SCB-2019) in unvaccinated household contacts in the Philippines: A cluster randomised analysis.

Journal: The Journal of infection

Published: May 15, 2024

Novel Oral Polio Vaccine Type 2 Use for Polio Outbreak Response: A Global Effort for a Global Health Emergency.

Novel Oral Polio Vaccine Type 2 Use for Polio Outbreak Response: A Global Effort for a Global Health Emergency.

Journal: Pathogens (Basel, Switzerland)

Published: February 17, 2024

Interchangeability of different COVID-19 vaccine platforms as booster doses: A phase 3 study mimicking real-world practice.

Interchangeability of different COVID-19 vaccine platforms as booster doses: A phase 3 study mimicking real-world practice.

Journal: Vaccine

Published: February 09, 2024

Navigating vaccine procurement and financing challenges in Cameroon: Insights and recommendations from a mixed-methods study (2015-2020).

Navigating vaccine procurement and financing challenges in Cameroon: Insights and recommendations from a mixed-methods study (2015-2020).

Journal: Public health

Published: January 20, 2024

SCB-2019 protein vaccine as heterologous booster of neutralizing activity against SARS-CoV-2 Omicron variants after immunization with other COVID-19 vaccines.

SCB-2019 protein vaccine as heterologous booster of neutralizing activity against SARS-CoV-2 Omicron variants after immunization with other COVID-19 vaccines.

Journal: Human vaccines & immunotherapeutics

Published: January 11, 2024

Landscaping analysis of immunization progress and program structures in selected middle income Southeast Asian countries.

Landscaping analysis of immunization progress and program structures in selected middle income Southeast Asian countries.

Journal: Vaccine

Published: November 16, 2023

Development of a composite scoring system to rank communities at high risk of zero-dose children in Cameroon: A geospatial analysis.

Development of a composite scoring system to rank communities at high risk of zero-dose children in Cameroon: A geospatial analysis.

Journal: Journal of global health

Published: November 16, 2023

Immunogenicity, safety and reactogenicity of heterologous (third dose) booster vaccination with a full or fractional dose of two different COVID-19 vaccines: A phase 4, single-blind, randomized controlled trial in adults.

Immunogenicity, safety and reactogenicity of heterologous (third dose) booster vaccination with a full or fractional dose of two different COVID-19 vaccines: A phase 4, single-blind, randomized controlled trial in adults.

Journal: Human vaccines & immunotherapeutics

Published: July 13, 2023

Showing 1-12 of 72

Last Updated: 09/26/2026