The Lingering Shadows of the Pandemic: A Global Measles Crisis


The world is grappling with an escalating measles crisis, exacerbated by the COVID-19 pandemic’s profound impact on vaccination rates and global health infrastructure. This situation places over 40 million children at risk, marking a significant setback in the fight against infectious diseases.

RankCountryNumber of Cases
5Russian Federation7,137
8Democratic Republic of the Congo (DRC)***3,917

Provisional data based on monthly data reported to WHO (Geneva) as of early December 2023. Data covers June 2023 – November 2023.
* Countries with highest number of cases for the period.
**WHO classifies all suspected measles cases reported from India as measles clinically compatible if a specimen was not collected as per the algorithm for classification of suspected measles in the WHO VPD Surveillance Standards.  Thus numbers might be different between what WHO reports and what India reports.
*** DRC typically reports more cases through the Integrated Disease Surveillance and Response system.

The Measles Resurgence: A Snapshot of the Crisis

Measles, a highly contagious airborne disease, has seen a resurgence that threatens global health security. Despite the availability of a cost-effective vaccine, in 2021, measles claimed the lives of approximately 128,000 individuals, predominantly children under five years old. The World Health Organization (WHO) reports that, by 2022, the global coverage for the first dose of the measles vaccine had plummeted to 83%, the lowest since 2008, despite the vaccine’s capability to prevent severe complications and death​​.

The Pandemic’s Role in Vaccination Disruption

The COVID-19 pandemic has significantly disrupted routine vaccination services, leading to a notable decline in immunization rates. This has left millions of children vulnerable to measles, a disease that had previously seen declining mortality rates thanks to global vaccination efforts. The pandemic-induced suspension of immunization services, coupled with a decrease in surveillance, has created a perfect storm, facilitating the spread of measles across the globe​​.

A Call for Renewed Vigilance and Action

The Centers for Disease Control and Prevention (CDC) and the WHO have reported an 18% increase in measles cases and a 43% rise in measles deaths in 2022 compared to the previous year. This resurgence has resulted in significant outbreaks in 37 countries, underscoring the need for urgent action to reverse the trend​​​​.

Global Efforts to Combat Measles

Organizations like the CDC are at the forefront of combating this resurgence by providing technical support to countries with large outbreaks, weak health systems, or low immunization rates. Their efforts focus on detecting measles outbreaks quickly, planning and implementing response immunization campaigns, and enhancing laboratory analysis capabilities to better manage and mitigate the spread of the disease​​.

The Path Forward: Strengthening Immunization Programs

Addressing this crisis requires a multifaceted approach, including accelerating immunization program recovery, closing immunity gaps, and ensuring robust surveillance systems are in place. The global health community must also navigate the challenges posed by vaccine hesitancy and the complex interplay of measles with other respiratory viruses, including influenza and RSV, to protect the most vulnerable populations and prevent further outbreaks​​.

Innovation in Treatment and Prevention

Recent advancements in antiviral treatments, such as the development of morbillivirus polymerase inhibitors, offer hope in the fight against measles. These novel treatments provide a promising avenue for preventing MeV-induced immune suppression and addressing the severity of morbillivirus infections, highlighting the importance of continued research and development in this area.

As the world emerges from the shadows of the COVID-19 pandemic, the resurgence of measles serves as a stark reminder of the critical importance of vaccination and the need for global cooperation to ensure health security for all.

Alarming Surge in Measles Cases Across WHO European Region

The WHO European Region is facing a significant public health challenge with an alarming increase in measles cases reported across its member states. Between January and October 2023, over 30,000 cases of measles were reported by 40 of the Region’s 53 Member States, marking a staggering increase from the 941 cases reported throughout 2022. This more than thirtyfold rise in cases has shown an accelerating trend in recent months, prompting urgent calls for action to prevent further spread of this highly contagious disease.

Dr. Hans Henri P. Kluge, WHO Regional Director for Europe, has expressed deep concern over the situation, highlighting not only the dramatic increase in measles cases but also the severe impact on public health, with nearly 21,000 hospitalizations and five measles-related deaths reported. “Vaccination is the only way to protect children from this potentially dangerous disease,” Dr. Kluge stated, underscoring the need for urgent vaccination efforts to halt transmission and prevent further spread. He emphasized the critical importance of countries being prepared to rapidly detect and respond to measles outbreaks to safeguard progress towards measles elimination.

Widespread Impact and the Role of Vaccination

The resurgence of measles in 2023 has affected individuals of all age groups, with a notable prevalence among children aged 1 to 4 years and adults over 20 years. The increase in cases and hospitalizations is largely attributed to a decline in vaccination coverage during the years 2020 to 2022, a period heavily impacted by the COVID-19 pandemic. The pandemic led to significant disruptions in immunization systems, resulting in over 1.8 million infants in the Region missing their measles vaccinations.

National coverage with the first dose of the measles-containing vaccine decreased from 96% in 2019 to 93% in 2022, while coverage for the second dose also saw a decline. The reduction in vaccination rates, coupled with the resumption of domestic and international travel and the removal of COVID-19 related social and public health measures, has heightened the risk of cross-border disease transmission and outbreaks, particularly in communities with low vaccination coverage.

Addressing Immunization Gaps

The resurgence underscores the urgency of addressing immunization inequities within countries to achieve and maintain high coverage in every community. Tailored immunization strategies targeting disparities and promoting vaccine equity are crucial. WHO/Europe, in collaboration with partners, is actively supporting affected countries through case investigations, vaccination of susceptible individuals, infection control in healthcare settings, awareness campaigns, and enhanced disease surveillance.

Countries are urged to assess their immunity gaps and program weaknesses comprehensively, taking immediate action to bolster their defenses against measles transmission. Achieving and maintaining over 95% coverage with two doses of the measles-containing vaccine is essential for regaining progress towards the elimination of measles and rubella, which remains a priority goal for the Region.

A Call for Collective Action

The current measles outbreak in the WHO European Region is a stark reminder of the importance of vaccination and the need for robust public health strategies to prevent infectious diseases. As countries work to address the challenge, the focus must remain on closing immunity gaps, ensuring high vaccination coverage, and implementing effective surveillance to monitor and respond to disease occurrence. Only through collective effort and commitment can the Region hope to get back on track towards the elimination of measles and safeguard the health of its populations.


In the wake of the COVID-19 pandemic, the scientific community has pivoted to addressing the urgent need for effective antiviral therapies against a spectrum of viral diseases, including those caused by members of the Paramyxoviridae family, such as Morbillivirus. This article delves into the intricacies of recent advancements in antiviral research, particularly focusing on Morbillivirus and Paramyxovirus, and explores the implications of these developments for future therapeutic strategies.

The Challenge of Morbillivirus and Paramyxovirus

Morbillivirus, which includes the measles virus (MeV), and other paramyxoviruses, have long presented a significant challenge to public health due to their highly contagious nature and potential for severe disease. Traditional therapeutic measures have been largely supportive, with a strong emphasis on vaccination as the primary mode of prevention. However, the emergence of drug-resistant strains and the global disruption of vaccination programs have underscored the need for effective antiviral treatments.

Advancements in Antiviral Therapeutics

Recent research has shed light on the potential of novel antiviral compounds, such as GHP-88309, which have shown promise in preclinical models for treating Morbillivirus infections. Studies have demonstrated that compounds like GHP-88309 can significantly extend the therapeutic window for treatment beyond what is achievable with therapeutic vaccination, highlighting a potential paradigm shift in the management of Morbillivirus diseases​​.

The Role of Immune Priming in Disease Severity

One of the most striking findings from recent studies is the impact of prior infection on the outcome of Morbillivirus infection. It has been observed that a history of respiratory infections, such as influenza, can prime the immune system in a way that exacerbates subsequent Morbillivirus infections. This phenomenon, which does not require a severe primary pneumonia to trigger, points to a complex interplay between the host’s immune history and the pathogenesis of Morbillivirus diseases​​.

The Importance of Trefoil Factor Family (TFF) Proteins

The role of Trefoil Factor Family (TFF) proteins in the respiratory tract has emerged as a focal point of interest in understanding the mechanisms underlying severe Morbillivirus infections. TFF proteins, known for their mucosal healing properties, are thought to be critical in maintaining lung immune homeostasis. The failure to upregulate TFF expression following a Morbillivirus infection, particularly in the context of prior immune priming, may contribute to the impaired clearance of commensal bacteria and the development of lethal bacterial superinfections​​.

Future Directions in Antiviral Drug Development

The insights gained from recent research not only underscore the complexity of Morbillivirus and Paramyxovirus infections but also highlight the potential for novel antiviral strategies. The development of direct-acting antivirals, capable of intervening at various stages of viral infection, offers a promising avenue for reducing the morbidity and mortality associated with these viruses. Furthermore, understanding the impact of prior disease history and the role of TFF proteins in infection outcomes can inform the design of more effective treatment protocols.


The quest for effective antiviral therapies against Morbillivirus and Paramyxovirus represents a critical frontier in infectious disease research. As our understanding of these viruses deepens, so too does the potential for developing treatments that can mitigate the severe outcomes associated with their infections. The advancements in antiviral research discussed herein not only offer hope for more effective interventions against Morbillivirus and Paramyxovirus but also exemplify the dynamic and evolving nature of the field of virology.

This overview of recent findings and their implications for antiviral therapy development highlights a pivotal moment in the fight against viral diseases, with the promise of innovative treatments on the horizon.

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