RSV vaccines comparison
ExportSanofi / Astra Zeneca
MSD (Merck)
Pfizer
EMA
United States
United States
2022
2025
2023
Not prequalified by WHO
Not prequalified by WHO
1-dose vial 2025 3-dose vial 2026
Fully‑human IgG1κ monoclonal antibody targeting prefusion RSV F‑protein
Fully human IgG1κ monoclonal antibody targeting prefusion RSV F‑protein
RSV subgroup A prefusion F antigen 60 μg
RSV subgroup B prefusion F antigen 60 μg
Recombinant Chinese Hamster Ovary cells
Recombinant Chinese Hamster Ovary cells
Recombinant Chinese Hamster Ovary cells
None
None
None
None
None
None
Not required
Not required
Water for injections
Liquid: ready to use
Liquid: ready to use
Lyophilized active component to be reconstituted with excipient diluent before use
Glass (Type 1) pre-filled syringe containing 50 mg of nirsevimab in 0.5 mL (100 mg/mL) or containing 100 mg of nirsevimab in 1 mL (100 mg/mL).
Glass (Type 1) pre-filled syringe containing 105 mg of clesrovimab in 0.75 mL (150 mg/mL)
Powder for 1-dose and 3-doses in a vial (type 1 borosilicate glass or equivalent)
The diluent for 1 dose in a pre-filled syringe (type 1 glass) / vial (type 1 glass or equivalent) and for a 3-dose presentation in a vial (type 1 glass)
intramuscular
intramuscular
intramuscular
24 months EU / 18 months US
30 months
36 months
2-8 °C
2-8 °C
2-8 °C
no information available
no information available
VVM30
No information available
134. 0 in carton of 1
53.3 in carton of 10
1-dose vial: 12.1 in the 25 doses pack
3-dose vial: 4.04 in 25 vials (75 doses) pack
Single dose of 50 mg administered intramuscularly for infants with body weight <5 kg and a single dose of 100 mg administered intramuscularly for infants with body weight ≥5 kg. Beyfortus should be administered from birth for infants born during the RSV season. For others born outside the season Beyfortus should be administered ideally prior to the RSV season.
A single dose of 200 mg given as two intramuscular injections (2 x 100 mg) for children who remain vulnerable to severe RSV disease through their second RSV season. Beyfortus should be administered ideally prior to the start of the second RSV season
Single 105 mg IM dose administered to neonates and infants who are born during or entering their first RSV season.
Infants born during season: dose at birth.
Born before season: dose before season starts.
Additional 105 mg dose recommended post‑cardiac bypass surgery
Pregnant women - A single dose of 0.5 mL should be administered between weeks 24 and 36 of gestation (EMA – 32-36 weeks for US FDA)
Individuals 18 years of age and older - a single dose of 0.5 mL should be administered.
no information available
no information available
no information available
not required
not required
not required
The benefits and risks of nirsevimab use in infants <1 kg should be carefully considered.
There are limited data available in extremely preterm infants (Gestational Age [GA] <29 weeks) less than 8 weeks of age. No clinical data available in infants with a postmenstrual age (gestational age at birth plus chronological age) of less than 32 weeks
The safety and efficacy of nirsevimab in children aged 2 to 18 years have not been established. No data are available
Can be given alongside routine childhood vaccines, in different syringes & sites
The safety and effectiveness of ENFLONSIA have not been established in children older than 12 months of age.
The safety and efficacy of Abrysvo in children (from birth to less than 18 years of age) have not yet been established. Limited data are available in pregnant adolescents and their infants
NO
NO
YES
Detailed pricing information for UNICEF and PAHO procurement can be found at:
https://www.unicef.org/supply/vaccines-pricing-data?page=%2C0#listAnchor
https://www.paho.org/en/documents/vaccine-prices-revolving-fund-2026
2024 Vaccine price ranges by product, procurement mechanism and income group as reported through the WHO/UNICEF JRF can be found at
https://www.who.int/teams/immunization-vaccines-and-biologicals/vaccine…
Detailed pricing information for UNICEF and PAHO procurement can be found at:
https://www.unicef.org/supply/vaccines-pricing-data?page=%2C0#listAnchor
https://www.paho.org/en/documents/vaccine-prices-revolving-fund-2026
2024 Vaccine price ranges by product, procurement mechanism and income group as reported through the WHO/UNICEF JRF can be found at
https://www.who.int/teams/immunization-vaccines-and-biologicals/vaccine…
Detailed pricing information for UNICEF and PAHO procurement can be found at:
https://www.unicef.org/supply/vaccines-pricing-data?page=%2C0#listAnchor
https://www.paho.org/en/documents/vaccine-prices-revolving-fund-2026
2024 Vaccine price ranges by product, procurement mechanism and income group as reported through the WHO/UNICEF JRF can be found at
https://www.who.int/teams/immunization-vaccines-and-biologicals/vaccine…
1. U.S. Food and Drug Administration (2025). ENFLONSIA™ (clesrovimab-cfor) injection, for intramuscular use: Highlights of prescribing information. Silver Spring, MD: FDA (https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/761432s000lbl… accessed 28 June 2026).
2. Merck & Co., Inc. (2026). ENFLONSIA is available to order today. Rahway (NJ): Merck & Co., Inc. (https://www.merckvaccines.com/enflonsia/wp-content/uploads/sites/276/20…, accessed 22 September 2026).
1. European Medicines Agency (n.d.). Abrysvo: EU summary of product characteristics [product information document]. Amsterdam: EMA (https://www.ema.europa.eu/en/documents/product-information/abrysvo-epar…, accessed 28 June 2026).
2. World Health Organization (n.d.). Abrysvo [online database]. Geneva: WHO (https://extranet.who.int/prequal/vaccines/p/abrysvo, accessed 28 June 2026).
3. World Health Organization (n.d.). Abrysvo [online database]. Geneva: WHO (https://extranet.who.int/prequal/vaccines/p/abrysvo-0, accessed 22 September 2026)
N/A
N/A
N/A
