An outbreak investigation of silicosis among sandstone carvers in Khok Samrong District, Lopburi Province, February 2021

Authors

  • Tadsaphorn Phookjit Division of Occupational and Environmental Diseases, Department of Disease Control
  • Hirunwut Praekunatham Division of Occupational and Environmental Diseases, Department of Disease Control
  • Sutatip Buranasatitnon Division of Occupational and Environmental Diseases, Department of Disease Control
  • Narongpon Dumavibhat Faculty of Medicine Siriraj Hospital, Mahidol University
  • Borworn Mitmark Division of Occupational and Environmental Diseases, Department of Disease Control
  • Sunsanee Pholprasert Division of Occupational and Environmental Diseases, Department of Disease Control
  • Busaba Suwannachote Khok Samrong Hospital

DOI:

https://doi.org/10.14456/dcj.2023.70

Keywords:

outbreak investigation, silicosis, sandstone carvers, silica dust

Abstract

On February 9, 2021, the Division of Occupational and Environmental Diseases, accompanied with the Division of Epidemiology, the Office of Disease Prevention and Control, Region 4 Saraburi Province (ODPC 4), and the Lopburi Provincial Health Office, investigated 3 cases of silicosis among sandstone carvers. The 3 cases lived in the same village in Khok Samrong District, Lopburi Province. The objectives of this study were to verify the diagnosis, describe the disease characteristics, determine risk factors, and provide recommendations and preventive measures. The descriptive epidemiological study was conducted by reviewing the medical records and interviewing the doctors and patients. The active case finding in the village and the working condition survey of the sandstone carvers were conducted. The silica dust in the working condition was measured and analyzed according to the National Institute for Occupational Safety and Health (NIOSH) Methods No. 7601. The data was analyzed by the descriptive statistics, including mean, median, percentage by volume (% volume). The results of the investigation revealed 13 confirmed silicosis cases diagnosed by the occupational medicine physicians with NIOSH certified B reader. The 13 confirmed cases of silicosis were divided into 2 groups: 1 case was the index case and 12 additional cases were reported from the active finding in the community. The median duration of working was 20 years (5-40 years). The results of silica dust measurement in the working condition indicated the process of using an electric grinding tool to polish the sandstone surface produced the amount of silica dust exceeding the threshold limit value (TLV) in working condition. Therefore, the work safety measures should be strictly practiced including to provide safety working condition, to encourage workers wearing appropriate personal protective equipment throughout the working period accompanied with to arrange the health literacy training to increase knowledge on health risk among workers.

References

Takashi S, Takeshi S, Dennis MK. Silicosis and lung cancer: current perspectives. Lung Cancer. 2018;9:91-101.

Kyle S, Elizabeth W. Silica: A Lung Carcinogen. CA Cancer J Clin. 2014;64(1):63-9.

Occupational Safety and Health Administration (OSHA). related to Crystalline silica. February 2020 [Internet]. [cited 2022 Jul 10]. Available from: https://www.osha.gov/silica-crystalline

Ministry of Labor (TH), Permanent Secretary. Diagnostic Criteria of Occupational Diseases Commemorative Edition on the Auspicious Occasion of His Majesty the King’s 80th Birthday Anniversary 5 December 2007:266 [Internet]. [cited 2022 Jul 10]. Available from: https://ddc.moph.go.th/uploads/ckeditor2//files/dcod80_63_01.pdf (in Thai)

Massimiliano L, Sandro V. Mini-review: Silico-tuberculosis. J Clin Tuberc Other Mycobact Dis. 2021;100218:1-4.

Ministry of Public Health (TH). Ministry of Public Health announcement: names or principal symptoms of occupational diseases or environmental diseases 2020. February 2021 [Internet]. [cited 2023 Mar 20]. Available from: https://ddc.moph.go.th/uploads/files/11320210 203104425.PDF (in Thai)

Ministry of Labour (TH). Ministry of Labor announcement: the subject determines the type of disease that occurs according to the nature or condition of the work or due to work. February 2023 [Internet]. [cited 2023 Mar 20]. Available from: https://www.thecoverage.info/sites/default/files/attach-files/2023-02/prakaskrathrwngaerngngan.pdf (in Thai)

Ministry of Industry (TH), Department of Industrial Works. Factory information that is licensed to operate industrial plants. February 2023 [Internet]. [cited 2023 Mar 20]. Available from: https://www.diw.go.th/webdiw/search-factory/ (in Thai)

Ministry of Public Health (TH), Health Data Center. Case Report from Silicosis during the year 2016-2020. Nonthaburi: Ministry of Public Health (TH), Health Data Center; 2022. (in Thai)

Occupational Safety and Health Administration (OSHA). NIOSH Manual of Analytical Methods (NMAM) related to Silica, Crystalline by VIS Method No. 7601. March 2003 [Internet]. [cited 2022 Aug 12]. Available from: https://www.cdc.gov/niosh/docs/2003-154/pdfs/7601.pdf

Ministry of Labor (TH), Department of Labour Protection and Welfare. Announcement of the Department of Labor Protection and Welfare: limits of Concentration of Hazardous Chemicals. August 2017 [Internet]. [cited 2022 Jul 10]. Available from: http://www.chemtrack.org/Law/MOLC-2560.pdf (in Thai)

American Conference of Governmental Industrial Hygienists (ACGIH) 2020 [Internet]. [cited 2022 Aug 12]. Available from: https://www.acgih.org/silica-crystalline-a-quartz-and-cristobalite/

World Health Organization. Tuberculosis profile of Thailand, Estimates of TB burden 2021 [Internet]. [cited 2022 Dec 1]. Available from: https://worldhealthorg.shinyapps.io/tb_profiles/?_inputs_&entity_type=%22country%22&lan=%22EN%22&iso2=%22TH%22

Sarang D, Subroto N. Assessment of silica dust exposure profile in relation to prevalence of silicosis among Indian sandstone mine workers: Need for review of standards. Am J Ind Med. 2020;63(3):277-81.

David LJ, Margaret LP, Anthony TV, Danielle AH, Chaolong Q. Experimental Evaluation of Respirable Dust and Crystalline Silica Controls During Simulated Performance of Stone Countertop Fabrication Tasks with Powered Hand Tools. Ann Work Expo Health. 2017;61(6): 711-23.

National Institute for Occupational Safety and Health (NIOSH). NIOSH Policy Statement: Respiratory Protection Recommendations for Airborne Exposures to Crystalline Silica. July 2008 [Internet]. [cited 2022 Aug 12]. Available from: https://www.cdc.gov/niosh/docs/2008-140/pdfs/2008-140.pdf

Fabiola S, Andrea M, Liviano V, Rosana B, Ottorino G, Gabriella G, et al. Occupational exposure to crystalline silica in artificial stone processing. J Occup Environ Hyg. 2021;18(12) :547-55.

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Published

2023-12-29

How to Cite

1.
Phookjit T, Praekunatham H, Buranasatitnon S, Dumavibhat N, Mitmark B, Pholprasert S, Suwannachote B. An outbreak investigation of silicosis among sandstone carvers in Khok Samrong District, Lopburi Province, February 2021. Dis Control J [Internet]. 2023 Dec. 29 [cited 2024 Apr. 20];49(4):858-70. Available from: https://he01.tci-thaijo.org/index.php/DCJ/article/view/260307

Issue

Section

Outbreak Investigation