An investigation of chikungunya outbreak in Baan Laem District, Phetchaburi Province, Thailand, August–October 2019

Authors

  • Farooq Phiriyasart Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Paninee Panyakarn Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Peeriya Watakulsin Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Chanatip Chailek Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Ravinan Soma Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Sarawut Aek–umphan Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Apichat Chrosrida Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Nuengruethai Srisong Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Chevin Somsawang The office of Disease Prevention and Control Region 5 (ODPC 5), Department of Disease Control
  • Nipa Sorsa-ard The office of Disease Prevention and Control Region 5 (ODPC 5), Department of Disease Control
  • Thanawadee Chantian Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control
  • Phanthanee Thitichai1 Field Epidemiology Training Program (FETP), Division of Epidemiology, Department of Disease Control

Keywords:

chikungunya, outbreak, Ban leam, Phetchaburi

Abstract

Background: On 2 August 2019, Joint Investigation Team (JIT) was notified a cluster of chikungunya in Baan Laem district, Phetchaburi. JIT from Division of Epidemiology, ODPC 5 and the Center for Vector–Borne Disease Control 5.2 Phetchaburi jointly investigated 15 May to 15 October 2019. We aimed to confirm the outbreak and diagnosis, describe epidemiologic characteristics, identify the source of the outbreak, and give recommendations for containing the outbreak
Methods: We reviewed medical records in the last five years in the hospital and performed active case finding in communities, private clinics, drugstores, and schools. We defined suspected cases as any person who was over five years old living in Baan Laem district from 15 May–15 October 2019 and had a fever and arthralgia or arthritis together with at least one of the following symptoms: maculopapular rash, muscle pain, headache, and retro– orbital pain and confirmed case who was confirmed by RT-PCR. We collected mosquitoes to test RT-PCR and genetic of the Chikungunya Virus by DNA sequencing. Survey of mosquito larvae index with evaluate its measures. A cross–sectional study was conducted to identify the association between villagers' perception and their cooperation using larvicide temephos.
Results: A total of 582 cases were detected, 7 confirmed cases (1.2%). Forty-two cases (7.2%) were hospitalized. Mean (SD) of age was 32 years old (17). The most distributed Ban Laem and Bang Khun Sai Subdistrict correlate with the highest larvae index of house index (HI) and container index (CI) around 50–52% and 10–12%. Entomology showed positive Chikungunya virus was ECSA genotype without mutation of E–1A226 gene. Villagers' perception that water containing larvicide temephos cannot be consumed associated with their cooperation on using larvicide temephos with statistically significant (OR 3.63, 95% CI 1.15–11.48).
Conclusion: A large outbreak of Chikungunya disease was confirmed with 582 cases. The most distributed Ban Laem and Bang Khun Sai Subdistrict. High HI, CI, and negative perception of control measures among people were the significant risk factors. Therefore, introduce all sectors in setting up and strengthening surveillance systems to cover health services in private and public sectors.

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Published

2021-04-21

How to Cite

Phiriyasart, F., Panyakarn, P., Watakulsin, P., Chailek, C., Soma, R., Aek–umphan, S., Chrosrida, A., Srisong, N., Somsawang, C., Sorsa-ard, N., Chantian, T., & Thitichai1, P. (2021). An investigation of chikungunya outbreak in Baan Laem District, Phetchaburi Province, Thailand, August–October 2019. Weekly Epidemiological Surveillance Report, 51(15), 210–218. retrieved from https://he05.tci-thaijo.org/index.php/WESR/article/view/1731

Issue

Vol. 51 No. 15 (2020): 15th week

Section

Original article

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