# The relationship between the nasopharyngeal cycle threshold value of RT-PCR COVID-19 to the duration of ultraviolet irradiation in N95 masks contaminated with SARS-CoV-2
> Savitri E.

URL kanonis: https://discover.unhas.ac.id/publications/pub_scopus_105033689533
Jurnal / Konferensi: Gazzetta Medica Italiana Archivio Per Le Scienze Mediche
Tahun terbit: 2026
DOI: https://doi.org/10.23736/S0393-3660.25.05881-4
ISSN: 03933660
Kuartil SJR: Q4
Citations: 0

## Authors
- Savitri E.

## Abstract
BACKGROUND: Coronavirus Disease 2019 (COVID-19) is an infectious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). SARS-CoV-2 is a new type of coronavirus that has never been identified before in humans. Sanitization of N95 masks for repeated use in the current COVID-19 emergency is due to a decrease in the supply of N95 masks in health facilities. One method that can be used today to maintain the supply of N95 respirators is through a cycle of decontamination and reuse with ultraviolet germicidal irradiation. The SARS-CoV-2 virus is very susceptible to ultraviolet light. This study aims to determine the effect of nasopharyngeal CT value RT-PCR COVID-19 on the duration of ultraviolet irradiation of N95 masks contaminated with SARS-CoV-2.METHODS: The study used a pre-experimental research design with a one-group pretest post-test design. The study was conducted at Hasanuddin University Hospital which was conducted on March 25, 2021-July 30, 2022. Nasopharyngeal CT values are measured by means of RT-PCR nasopharyngeal swab results of patients confirmed positive for COVID-19 within a maximum of 24 hours after the results come out. After the irradiation is complete, remove the N95 Respirator section and prepare for a qualitative assessment of the SARS-CoV-2 virus.RESULTS: The results of the Paired Wise Comparison Test show the difference between the average CT value before irradiation and the average CT value after irradiation with a P value of <0.05 which shows a meaningful relationship.CONCLUSIONS: The duration of irradiation in this study shows the results of different CT values at each irradiation duration. There is a significant relationship between CT value and irradiation duration.

## Keywords
- Respirator
- Irradiation
- Medicine
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
- Coronavirus disease 2019 (COVID-19)
- Ultraviolet irradiation
- Ultraviolet
- Nuclear medicine
- Contamination
- Exposure duration
- Coronavirus
- Significant difference
- Ultraviolet light
- Duration (music)
- Radiochemistry
- Ultraviolet radiation
- Human decontamination
- 2019-20 coronavirus outbreak

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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