By Ana Espino | Published on May 4, 2026 | 4 min read
Lyme disease is the most common vector-borne disease in
North America and Europe, caused by the bacterium Borrelia burgdorferi.
Its incidence continues to rise, making it a major public health concern.
However, no vaccine is currently available for humans since the withdrawal of
LYMErix in 2002 due to safety concerns and insufficient uptake.
The disease presents significant clinical variability,
ranging from early flu-like symptoms to late complications affecting the
joints, nervous system, or heart. This diversity, combined with a complex
transmission cycle involving ticks and animal hosts, makes prevention
particularly challenging.
In this context, the development of an effective, safe, and
durable vaccine represents a major challenge. This systematic review and
meta-analysis, recently published in Frontiers in Cellular and Infection
Microbiology, aims to evaluate the most promising vaccine candidates
currently under development in order to identify the most relevant strategies
for future human vaccination.
What vaccines for lyme disease ?
The study is based on a rigorous analysis of 16 studies
selected from more than 300 publications. The data mainly come from preclinical
trials conducted in animals, particularly mice and hamsters, allowing
assessment of vaccine efficacy and safety.
The results show that most vaccine strategies are based on
the Borrelia surface protein OspA, already used in the LYMErix vaccine.
However, new approaches aim to improve its profile by combining this protein
with other technologies, such as nanoparticles, membrane vesicles, or mRNA
platforms.
Some innovative strategies involve fusing different variants
of OspA to target multiple Borrelia species, or incorporating the
antigen into structures that mimic the bacterium to enhance the immune
response. Other candidates target alternative proteins, such as VlsE, P66, or
BB0172, with variable but sometimes promising results.
Data indicate that several candidates—particularly
OspA-based formulations, multivalent vaccines, or those combined with membrane
vesicles—induce a significant protective immune response in animal models.
Notably, modified OspA vaccines appear to be the most effective, while aiming
to reduce the adverse effects observed with earlier generations.
What challenges for an effective vaccine ?
The development of a Lyme disease vaccine faces several
challenges. The diversity of Borrelia species, variability in immune
responses, and the complexity of the transmission cycle complicate the design
of a universal vaccine.
Animal models, while essential, also have limitations. For
example, some models do not accurately reproduce human complications,
particularly Lyme arthritis, making safety evaluation more difficult. The
introduction of more relevant models, such as C3H mice, has improved
assessment, but uncertainties remain.
Additionally, the heterogeneity of studies in terms of
formulations, doses, and protocols makes comparisons difficult and highlights
the need for standardization in future trials.
Towards a new generation vaccine ?
This meta-analysis highlights the potential of several
vaccine candidates, particularly those based on OspA and its derivatives, which
remain the most advanced and promising. New technologies, such as mRNA vaccines
or nanoparticles, open up interesting perspectives for improving the
effectiveness and durability of the immune response.
However, despite encouraging preclinical results, several
steps remain before clinical application. It is necessary to confirm long-term
efficacy, assess safety in humans, and better understand the underlying immune
mechanisms.
“The development of a vaccine against Lyme disease now
relies on a combination of technological innovations and a better understanding
of the immune response,” the authors suggest.
Ultimately, these advances could help fill a major public
health gap and significantly reduce the incidence of Lyme disease—provided
these strategies are validated in rigorous clinical trials.
Read next : Chagas:
Is a vaccine finally within reach?
About the author – Ana Espino
PhD in Immunology, specialized in Virology
As a scientific writer, Ana is passionate about bridging the gap
between research and real-world impact. With expertise in immunology, virology,
oncology, and clinical studies, she makes complex science clear and accessible.
Her mission: to accelerate knowledge sharing and empower evidence-based
decisions through impactful communication. 
