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The rising global burden of mosquito-borne viral infections has important implications for Canadian clinicians—particularly those assessing febrile patients returning from tropical and subtropical regions. On this episode of the CMAJ Podcast, infectious diseases specialists Dr. Maxime Billick and Dr. Stephen Vaughan explain what clinicians need to watch for as these viruses expand their geographic reach. Dr. Billick is the lead author of Five things to know about dengue, and Dr. Vaughan is the lead author of Five things to know about Oropouche virus, both published in CMAJ.

Dr. Maxime Billick describes the dramatic surge in dengue cases in 2024 and outlines the major drivers behind the virus’s global spread. She explains the urban-dwelling mosquito vectors that make dengue difficult to contain, discusses the virus’s four serotypes, and emphasizes the risk of antibody-dependent enhancement with reinfection. She reviews key clinical warning signs, diagnostic tests, and why identifying dengue—despite limited treatment options—still matters for patient counselling and care.

Dr. Stephen Vaughan introduces the less common but emerging Oropouche virus. He explains its current geographic range, including recent Canadian travel-related cases, and the role of biting midges in its transmission. Vaughan highlights early evidence of possible sexual transmission and the potential risks for fetal neurological complications if infection occurs during pregnancy. He also discusses symptom recurrence and what physicians should consider when counselling patients who may have been exposed.

Physicians should consider dengue and Oropouche virus in febrile returned travellers and prioritize preventive counselling before travel. Identifying the virus may not change treatment, but it can shape long-term risk awareness and help prevent future complications.

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