Vaccines 2025

Impact of RSV prevention on pediatric hospitalizations - U.S., Oct 2024-Feb 2025

Morbidity and Mortality Weekly Report | May 8, 2025 9 May, 2025 Respiratory Syncytial Virus (RSV) is the leading cause of hospitalization among U.S. infants, particularly those aged 0–2 months. Maternal RSV vaccination and nirsevimab (a long-acting monoclonal antibody) administration were introduced during the 2023–2024 U.S. RSV season. A study published in MMWR assessed the association between the availability of these interventions and RSV-associated hospitalizations by comparing pediatric hospitalization rates from RSV-NET and NVSN during the 2024–2025 season with those from the 2018–2020 pre–COVID-19 seasons. Read More

FDA names Vinay Prasad as new head of vaccines, biologics

7 May, 2025 What are Dr. Vinay Prasad’s views on vaccines?
Dr. Vinay Prasad, a hematologist-oncologist and professor at UCSF, was appointed director of the FDA’s Center for Biologics Evaluation and Research (CBER), overseeing vaccine regulation. While he recognizes COVID-19 vaccines as life-saving, he has publicly criticized several related policies. Read More

FDA to mandate placebo-controlled trials for new vaccines

1 May, 2025 The U.S. Department of Health and Human Services has announced that all new vaccines will be required to undergo placebo-controlled trials prior to receiving licensure.
Traditionally, modern vaccine trials have compared investigational vaccines to existing licensed vaccines rather than to placebos, primarily due to ethical considerations. When an effective vaccine already exists for a given disease, the use of a placebo in clinical trials would entail withholding proven protection, thereby exposing participants to unnecessary risk. This practice contravenes the ethical principle of non-maleficence, which obligates researchers to minimize harm. Read More

Same arm, stronger immunity

Dhenni et al., 2025, Cell 188, 1–20 28 April, 2025 Scientists from Sydney have discovered that administering a booster dose in the same arm as the initial vaccination can elicit a faster and more effective immune response. Published in Cell, their findings provide new insights that could inform future vaccination strategies.
The researchers found that after vaccination, macrophages in nearby lymph nodes undergo "priming," preparing them to guide memory B cells for a more rapid and robust response if the booster is delivered to the same site. Previous work showed that memory B cells - critical for mounting antibody responses upon reinfection -tend to reside in the lymph node closest to the original injection. Read More

RSV Vaccination

26 April, 2025 The Advisory Committee on Immunization Practices (ACIP) in the United States recently recommended administering a vaccine against Respiratory Syncytial Virus (RSV) to individuals aged 50–59 who are in high-risk groups. This is in addition to the existing recommendations for vaccinating individuals aged 75 and older, as well as adults aged 60–74 who are at increased risk.
RSV belongs to the family Paramyxoviridae and is one of the most common causes of respiratory tract and lung infections worldwide, particularly during the winter months. The virus causes a range of respiratory infections across all age groups but is particularly dangerous in infants and older adults. Read More

Uganda launches largest malaria vaccine introduction to date

2 April, 2025 Uganda has launched a malaria vaccination campaign in Apac District, northern Uganda. This makes Uganda the 19th country in Africa to introduce the malaria vaccine into routine immunisation, and it marks the largest malaria vaccine roll-out to date in terms of target districts and population.
The R21/Matrix-M malaria vaccine, administered in four doses at 6, 7, 8, and 18 months, will initially target 1.1 million children under two years of age in 105 high- and moderate-transmission districts across Uganda, with plans for nationwide expansion. Read More

ASFV-G-∆I177L vaccine reverts to virulence and impairs reproduction

npj Vaccines | ( 2025) 10:46 10 March, 2025 The ASFV-G-ΔI177L vaccine is a modified-live African swine fever virus (ASFV) strain developed as a vaccination measure against African swine fever (ASF) in pigs. This vaccine strain was created by partially deleting the I177L gene and replacing it with the mCherry reporter gene.
The ASFV-G-ΔI177L strain has been incorporated into a commercially available vaccine, used to immunize pigs, particularly via intramuscular or oronasal routes. It has shown promise in protecting commercial pigs against ASFV infection. However, concerns regarding its genetic stability emerged following studies indicating that ASFV-G-ΔI177L could revert to virulence during in vivo passaging. Reversion was associated with ASF-specific clinical signs and increased viremia in infected pigs, raising concerns about its safety and effectiveness as a vaccine. Read More

CDC report strengthens evidence of HPV vaccine's role in preventing cervical cancer

1 March, 2025 A new report published in MMWR found that between 2008 and 2022, cervical precancer incidence decreased by 79%, and higher-grade precancer incidence decreased by 80% among screened women aged 20–24 years - the age group most likely to have been vaccinated.
Human papillomavirus (HPV) causes approximately 10,800 cervical cancers annually in the United States, making cervical cancer the most common HPV-attributable cancer among women. Between 2008 and 2022, a total of 39,977 cases of cervical precancer were reported in the U.S. Read More

'Post-vaccination syndrome' after Covid-19 vaccination

medRxiv preprint | February 18, 2025 22 February, 2025 COVID-19 vaccines provided significant protection and prevented millions of deaths. However, in a small number of individuals, the vaccines may have led to a range of side effects, including fatigue, myalgia, brain fog, tinnitus, and dizziness, collectively referred to as 'post-vaccination syndrome,' according to a new small-scale study conducted by scientists at Yale University. Read More

Measles in Texas, USA

21 February, 2025 Texas health authorities recently reported an unusual measles outbreak with 90 confirmed cases (as of February 21), the majority occurring in children and adolescents. Most cases have been reported in Gaines County. Sixteen patients have been hospitalized, and most affected individuals are under the age of 18. This is the most severe measles outbreak in Texas in approximately 30 years. Four of the infected individuals were vaccinated, while the remainder were not.
A study published in 2021 in Scientific Reports analyzed the rise in measles cases in the United States in the post-elimination era (the U.S. declared measles eliminated in 2000), covering the period from 2001 to 2019. Read More

Vaccines under attack

18 February, 2025 The controversial appointment of Robert F. Kennedy as Secretary of Health in the new Trump administration undoubtedly raises concerns about the "future" of vaccines and immunization rates within the population. Moreover, this appointment provides momentum to various anti-vaccination movements. Read More