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The UK Health Security Agency (UKHSA) recently announced that a new clade Ib mpox had been detected in England in an individual who recently returned from Uganda, where there is community transmission of the clade Ib mpox virus.
According to the UKHSA on January 20, 2025, this is the sixth case of clade Ib mpox confirmed since October 2024.

The World Health Organization (WHO) today confirmed an outbreak of Marburg virus disease (MVD) in the northwestern Kagera region, in Biharamulo district.
The President of the Republic of Tanzania, Her Excellency Samia Suluhu Hassan, announced during a press briefing on January 20, 2025, after one suspected case tested positive for the virus.

Chikungunya virus outbreaks have been reported in Brazil since 2014 and have not subsided in 2025. According to new data, the highest risk to international travelers of contracting this mosquito-transmitted disease is around São Paulo and Rio de Janeiro.
As of January 17, 2025, the Pan American Health Organization (PAHO) reported that 523 Chikungunya virus (CHIKV) cases were confirmed in Brazil during the initial two weeks of 2025.

When international travelers plan to visit a country that requires proof of yellow fever (YF) vaccination, other vaccines may be administered at travel clinics to protect the person from disease.
Because booster doses of pneumococcal conjugate vaccine (PCV) may be given at a similar time to yellow fever vaccine, researchers believed it essential to assess the immune response to YF when co-administered with PCV.

Throughout 2024, various health agencies issued travel alerts regarding the detection of polioviruses. While polio is a vaccine-preventable disease, virus detections in wastewater and the environment have continued in 2025.
The Global Polio Eradication Initiative has confirmed various countries are reporting cases of wild polio, circulating vaccine-derived poliovirus type 2, and circulating vaccine-derived poliovirus type 1.