A case report of Japanese encephalitis in Paracelis, Mountain Province, the Philippines


  • Fe S Mapangdol Field Epidemiology Training Program – Intermediate Course; Luis Hora Memorial Regional Hospital, Abatan, Bauko, Mountain Province, Philippines
  • Ray Justin C Ventura Department of Health, Manila, Philippines
  • Mariz Zheila C Blanco Department of Health, Manila, Philippines
  • Sheryl Racelis-Andrada Mariano Marcos Memorial Hospital and Medical Center, Batac, Ilocos Norte, Philippines
  • Rosario P Pamintuan Department of Health, Manila, Philippines
  • Rio L Magpantay Department of Health, Manila, Philippines
  • Karen B Lonogan Department of Health Center for Health Development, Cordillera Administrative Region, Philippines




Japanese encephalitis, vector-borne diseases, contact tracing, vaccination coverage, Philippines


On 12 September 2022, a 10-year-old female in Paracelis municipality, Mountain Province, the Philippines, without travel history outside the municipality, experienced acute onset of fever and a change in mental status with disorientation, an altered level of consciousness and new onset of seizures. She was hospitalized at the district hospital from 1 to 3 October 2022, before being transferred to the regional hospital. As diphtheria was originally suspected, the investigation team reviewed records and reports and interviewed key informants to gather additional information and organize case finding and contact tracing. The patient’s condition was laboratory-confirmed for Japanese encephalitis virus infection. An environmental survey was carried out at the patient's residence to check for the presence of vectors and contributing factors. Exemplifying inadequate vaccination coverage for Japanese encephalitis virus in Mountain Province, the patient had not been vaccinated against the disease. It is recommended that vaccination campaigns be immediately implemented in the affected area and the surveillance system be strengthened for early detection and prompt response to the emergence of cases and outbreaks. Overall, the investigation highlighted the importance of strong surveillance and response systems for early detection and control of diseases, such as Japanese encephalitis virus. It also underscores the need for comprehensive vaccination programmes to prevent outbreaks and protect vulnerable populations.




How to Cite

Mapangdol FS, Ventura RJC, Blanco MZC, Racelis-Andrada S, Pamintuan RP, Magpantay RL, Lonogan KB. A case report of Japanese encephalitis in Paracelis, Mountain Province, the Philippines. Western Pac Surveill Response J [Internet]. 2024 Jun. 27 [cited 2024 Jul. 16];15(2). Available from: https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/1049



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