Vaccine News

Since the declaration of the emergency, both regional and global support has increased, particularly for the Democratic Republic of the Congo (DRC), the epicentre of the ongoing mpox outbreak. Despite progress, significant challenges remain.

In the first two months of 2025, 60 countries reported mpox, with the majority of cases and deaths reported from the African continent. 

The Africa CDC and WHO Joint Continental Mpox Plan has guided efforts to reduce this outbreak, focusing on ten key pillars: coordination, risk communication and community engagement, disease surveillance, laboratory capacity, clinical management, infection prevention and control, vaccination, research, logistics, and maintaining essential health services. 

As of April 20, 2025, mpox vaccination efforts are underway, with more than 650,000 doses administered in six countries, 90% of which have been administered in the DRC.

Overall, over a million doses have been delivered to 10 countries, with efforts ongoing to secure additional vaccine supplies. 

The leading mpox vaccine, JYNNEOS® (MVA-BN®, IMVAMUNE®), is produced by Bavarian Nordic A/S.

Along with the Continental Response Plan for Africa, the WHO has updated the global strategic plan to curb – and, where feasible, to stop – human-to-human transmission of mpox. The joint Continental Response Plan is aligned with the global strategy.

To alert international visitors of the ongoing mpox risk in Africa, the U.S. CDC issued a Level 2 - Practice Enhanced Precautions, Travel Health Advisory on April 1, 2025.

The CDC says people usually get mpox through intimate or close contact, including sex, with an infected person.

Mpox vaccination is recommended for people who anticipate sexual activities during travel to countries with ongoing person-to-person transmission of clade I mpox. In the U.S., the JYNNEOS vaccine is commercially available at clinics and pharmacies as of 2025.

The Florida Department of Health recently published its Arbovirus Surveillance update #15, disclosing that mosquito-borne diseases have been detected in residents and visitors this year.

While most cases of chikungunya, dengue, and malaria have been confirmed in Miami-Dade County, which is currently under a mosquito-borne illness alert, counties on both Florida's coasts have reported infections.

As of April 12, 2025, there was one confirmed travel-related case of chikungunya in 2025. Eleven instances of chikungunya onset in 2024 were reported in individuals with a travel history to Brazil (five), India (five), and Pakistan.

Throughout 2025, fifty-nine cases of dengue fever were reported among individuals who had traveled internationally, and one locally acquired case of dengue (DEN-3) was reported in Miami-Dade County. 

As of December 2024, 1,016 travel-associated dengue cases had been reported, primarily among visitors from Brazil, Cuba (567), and Puerto Rico. In 2024, 91 locally acquired dengue cases were reported from ten counties (Miami-Dade (50),

This year, ten travel-related malaria cases have been confirmed in the state of Florida. In 2024, 72 cases of travel-related malaria were reported in individuals with a history of visiting malaria-endemic areas, such as Africa (Nigeria) and Central and South America.

From a disease-prevention perspective, while chikungunya vaccines are amply available in Florida, dengue and malaria vaccines are only available in other countries.

As of April 19, 2025, the U.S. Centers for Disease Control and Prevention, Canada Health, and the United Kingdom have not issued vaccination requirements for visiting Florida; however, these agencies recommend staying up to date with recommended vaccines as the best travel advice.

West Africa continues to bear the scars of the Ebola outbreak that occurred a decade ago. From 2014 to 2016, Sierra Leone, Guinea, and Liberia faced the largest Ebola outbreak since the virus was first discovered in 1976.

This Ebola outbreak resulted in over 28,000 cases and 11,000 related fatalities.

As of April 2025, more than 30 Ebolavirus disease outbreaks have been reported.

The good news is that vaccines against Ebolavirus, the pathogen responsible for those outbreaks, have since been licensed, and stockpiles have been developed.

"All Ebola outbreaks that have occurred since we had a stockpile were quickly stopped – thanks to the vaccines and rapid other response measures," says Allyson Russell, an epidemiologist and senior programme manager in Gavi's High Impact Outbreaks team, in a GAVI news article published on April 15, 2025.

However, these Ebola vaccines aren't effective against the other three orthoebolaviruses that cause severe disease, including the Sudan virus outbreak in the Republic of Uganda.

Uganda's Ministry of Health declared its eighth Sudan Ebolavirus outbreak in January 2025. Since then, about 14 cases, including four related fatalities, have been reported.

To alert the international community, the U.S. government recently updated a Level 2 Travel Health Advisory.

On March 12, 2025, the Centers for Disease Control and Prevention confirmed a Sudan virus outbreak in the districts of Kampala, Wakiso, Jinja, Mbale, Kyegegwa, Kabarole, and Ntoroko.

Still, the unpredictability and rapid progression of Ebola outbreaks make testing vaccine efficacy challenging.

As of April 19, 2025, no vaccines have been approved to protect people against the Sudan Ebola virus. However, candidate vaccines are being tested in the Solidarity Against Ebola human clinical studies in Africa.

Over the past decade, the Republic of Costa Rica has seen a significant increase in tourism from the United States and the United Kingdom, which has dramatically boosted the local economy.

However, the Tico Times reported on April 17, 2025, that the positive tourism trend has suddenly shifted in 2025.

This local media outlet's article, "Why Tourists Are Vanishing," reported that in February 2025, only 270,810 tourists arrived in Costa Rica by air, a 7% decrease from the previous year.

According to the Costa Rican Tourism Board, this data marks six consecutive months of decline.

The reasons behind these decreases include tourists facing higher costs due to the local currency, rising insecurity, an increase in tourists reporting crimes such as assaults and thefts, and eating shellfish.

On April 15, 2025, the U.S. Embassy confirmed a ban on the harvesting and sale of bivalve mollusks (such as piangua, mussels, clams, and oysters) from the coastal area between Playa Herradura and the mouth of the Guacimal River.

According to local authorities, recent tests in shellfish from this region detected paralytic marine toxins, a serious type of toxin that can lead to shellfish poisoning.

Additionally, mosquito-borne diseases such as chikungunya, dengue, and Zika are once again affecting both residents and international visitors.

The Ministry of Health and the Pan American Health Organization have confirmed, as of April 18, 2025, that seven cases of chikungunya have been reported so far this year, 1,957 cases of dengue, six cases of malaria, and six cases of Zika.

Recently, the Ministry of Health announced positive news as the local vector control teams are proactively eliminating mosquito breeding sites and fumigating houses to reduce these infections.

Moreover, approved vaccines to prevent chikungunya and dengue are available in various countries this year.

While tourists have other Central American and Caribbean destinations to visit, Costa Rica's lush mountains and delightful beaches will continue to welcome visitors during the summer of 2025.

Preliminary data published today showed that Novavax's non-mRNA JN.1 COVID-19 vaccine induced a lower frequency and severity of short-term side effects and a less significant impact on daily life compared with an mRNA vaccine.

Announced on April 15, 2025, Novavax, Inc. announced preliminary results from the SHIELD-Utah study that showed Novavax's COVID-19 Vaccine, Adjuvanted (2024-2025 Formula) targeting the JN.1 strain resulted in fewer and less severe reactogenicity symptoms, when compared with the Pfizer-BioNTech mRNA 2024-2025 vaccine.

This real-world study showed that the impact of symptoms on daily activities, including work and family responsibilities, was lower in recipients of Novavax's vaccine.

"The risk of side effects or reactogenicity is a major decision factor for those opting to get vaccinated. Our findings of lower frequency and intensity of reactogenicity symptoms from the protein-based COVID-19 vaccine observed in SHIELD-Utah add valuable insights to the public debate weighing choice and value of COVID-19 vaccination," said Sarang K. Yoon, DO, MOH, Principal Investigator, University of Utah Health, in a press release.

As in previous studies, the SHIELD study found health care workers who received the Novavax vaccine reported significantly fewer reactogenicity events than Pfizer-BioNTech recipients. 

Belize, a Central American country, recently reported cases of locally transmitted malaria in Santa Elena Town and Cristo Rey Village, both located in the Cayo District in the western area.

As of April 15, 2025, according to a Facebook post, these are the first instances of locally acquired malaria confirmed by Belize's Ministry of Health and Wellness in over six years.

In 2023, Belize joined El Salvador to become the second country in Central America to be certified by the World Health Organization (WHO) as malaria-free.

To achieve this public health milestone, beginning in 2015, Belize's national malaria program and the Vector Ecology Center reoriented their malaria program to place a greater focus on enhanced surveillance among high-risk populations. This enabled the strategic targeting of interventions and available resources in priority areas to reduce the incidence of this mosquito-transmitted disease.

Eighteen countries, including one territory in the Region of the Americas, are currently at risk of malaria. In the Americas, over 500,000 cases of malaria and around 116 deaths were reported in 2023.

While the WHO has certified two malaria vaccines for use in Africa, neither is available in Belize or the United States.

In addition to malaria, there has been evidence of chikungunya virus transmission in Belize within the last 5 years. According to the U.S. CDC, chikungunya vaccination may be considered for specific travelers in 2025. Chikungunya vaccines are commercially available at travel clinics and pharmacies in April 2025.

Since Fiji's Ministry of Health and Medical Services declared a dengue fever outbreak in the Western Division on February 3, 2025, over 5,100 cases have been reported.

As of April 8, 2025, the Ministry says the dengue serotypes causing the current outbreak are Type 2 (DENV-2) and 3 (DENV-3). The Government is maintaining a previously issued red alert for DENV-2 and DENV-3.

In 2014, the Fijian Government launched a cleanup campaign to reduce the number of mosquitoes transmitting dengue viruses. As of April 15, 2025, this public health effort is ongoing.

Today, the U.S. Centers for Disease Control and Prevention (CDC) reissued a Global Travel Health Notice highlighting Fiji to alert international travelers intending to visit this Pacific Ocean vacation hotspot.

The CDC has identified more than expected dengue cases among U.S. travelers returning from outbreak areas in 2025.

While second-generation dengue vaccines are offered in numerous countries, no vaccine is currently offered in the United States.