Disinfeksi Peralatan Scuba dan COVID-19

The novel coronavirus, also known as SARS-CoV-2, is the cause of the disease COVID-19, which has killed 87,987 people worldwide at the time of this article.1 SARS-CoV-2 is part of the viral group known as “corona” (Latin for “crown” or “halo”) because of the pattern of proteins that stud its surface.2 It is estimated that this group of viruses is responsible for 15 to 30 percent of acute respiratory infections each year.3 These numbers, however, are subject to rapid change as a result of the current pandemic.

COVID-19 spreads via respiratory secretions in a variety of ways including aerosolized droplets expelled by coughing or sneezing, touching surfaces contaminated with the virus, or close contact with someone who has the virus.2 The incubation period of the virus ranges from 2-14 days.2 One study identified the median incubation as 5.1 days with 97.5 percent of patients showing symptoms within 11.5 days.3

Coronaviruses belong to a group of enveloped viruses, which means the virion (the form that the virus takes while outside the host cell) is protected by an oily lipid layer.4 As with most enveloped viruses, damaging or destroying this lipid layer will inactivate the virus. Studies of other coronaviruses have shown their infectivity can be reduced by heat, UV light and alkaline or acidic conditions.5 Because of this, and the fact that enveloped viruses are generally easily inactivated, surfaces can be disinfected using household cleaning products.6

Because research into SARS-CoV-2 is ongoing, there is debate about how long it can survive on surfaces. Recent studies have shown that it can survive up to 3 hours in an aerosol droplet (such as from a sneeze), 4 hours on copper, 24 hours on cardboard, and 2-3 days on plastic and stainless steel.7 In water, however, it is unclear how long SARS-CoV-2 survives. Studies on the SARS virus, called SARS-CoV-1 and the cause of an epidemic in 2003, have shown that it remained infectious for long periods in surface water (lakes, rivers, wetlands, etc.) and previously pasteurized sewage at both low and ambient temperatures.8 In chlorinated or bromated pools and hot tubs, the CDC specifies that SARS-CoV-2 would be inactivated.9

Panas

There is very little data on SARS-CoV-2, and much of it is preliminary. In times like these scientists will look to related but slightly harder-to-kill viruses. In the case of the novel coronavirus, some data reports are based on the SARS-CoV-1 virus because it is more difficult to kill than the novel coronavirus. One study found that the SARS-CoV-1 virus loses infectivity after being heated to 133°F (56°C) for 15 minutes,5 and the World Health Organization specifies this temperature and timing as well.10 Another study found that the SARS-CoV-1 virus remains stable between 40°F (4°C) and 98°F (37°C) and would lose infectivity after 30 minutes at 133°F (56°C).11

Divers Alert Network has received questions about the virus entering a scuba cylinder as a result of contaminated air being drawn into the compressor. During the process of compressing air, using the ideal gas equation T2 = T1 x (P2/P1)(n-1)/n we can calculate that a four-stage compressor with 1 ATA inlet pressure and an 80°F environment pumping air up to 29 ATA or around 4000 psi, would have an inter-stage temperature inside the cylinder of 224 °F. This calculation is very basic and does not account for anything outside of ideal conditions. However, it does indicate the instantaneous temperature at the moment of peak pressure.

Pada kenyataannya, suhu katup output kemungkinan akan menjadi 170 °F-190°F, dan suhu gas sekitar 150°F, terjadi selama setiap tahap kompresor (yaitu empat siklus untuk kompresor empat tahap dengan asumsi suhu outputsetiap tahap adalah sama). Karena suhu ini cukup panas untuk membunuh SARS-CoV-2, maka kecil kemungkinan COVID-19 akan bertahan dari proses ini, termasuk jika seseorang yang terinfeksi virus batuk ke dalam saluran masuk kompresor. Penting untuk dicatat bahwa droplet yang terinfeksi yang dihembuskan oleh seseorang bisa sekecil 0,5 mikron; sistem filter saja tidak akan dapat menyaring ini, tetapi virus sudah menjadi mati pada tahap itu.

It should be noted, however, that if an individual carried the virus on their hands, either as a result of being infected or unknowingly touching an infected surface, and touches the cylinder valve or fill whip, the virus could potentially enter the cylinder through this route. It has been shown that some viruses are extremely pressure resistant — an order of magnitude above diving gas storage pressures. These studies, however, were conducted on noroviruses, a non-enveloped group of viruses that are generally harder to kill than enveloped viruses.12, 13 Other studies conducted on enveloped viruses such as the flu only explored the efficacy of high hydrostatic pressure at 289.6 MPa (42,003 PSI).14 It is therefore very important to practice hand washing and disinfection of high-touch areas including cylinders and fill stations, as it is likely that a virus could survive at diving gas storage pressures.

Senyawa Amonium Kuarter

Quaternary ammonium compounds, or quats, are a group of chemicals that are exceedingly common as active ingredients in cleaning solutions. These agents are hydrophobic and as such are effective against enveloped viruses. Quats are thought to react with the viral envelope and “disorganize” it, leading to the contents of the virus leaking out and degrading. In addition, little evidence exists to support viral resistance against these compounds.15 Studies have shown that quats are effective against SARS-CoV-1,16 and the World Health Organization (WHO) recommends the use of cleaning products containing these compounds in their laboratory biosafety guidance related to coronavirus disease 2019.17

Ada produk yang mengandung amonium kuater yang biasa digunakan dalam industri scuba untuk mendisinfeksi peralatan. Namun, senyawa ini berbahaya bagi lingkungan, jadi penggunaan dan pembuangannya harus hati-hati.18

Pemutih

Bleach, or sodium hypochlorite, has been studied in many different concentrations, and its effectiveness against viruses has been proven. It is a strong oxidant that works by damaging the viral genome.19 According to the WHO, the recommended bleach solution for general disinfection is a 1:100 dilution of 5 percent sodium hypochlorite. (Note that some brands of bleach have different concentrations of the active ingredient, such as those that are thickened and marketed to reduce splashing.) This dilution yields 0.05 percent or 500 ppm of the active ingredient and requires a soaking time of 30 minutes if objects are immersed in the solution or at least 10 minutes if sprayed onto a nonporous surface.20 In a study that examined SARS-CoV-2 specifically, it was found that a bleach concentration of 0.1 percent or 1,000 ppm was needed to reduce infectivity when sprayed onto a hard-non-porous surface.21 A second study on the same virus found that 0.1 percent sodium hypochlorite would inactivate the virus within 1 minute. A study on SARS-CoV-1 found that both 1:50 (0.1 percent) and 1:100 (0.05 percent) inactivated the virus after an immersion of 5 minutes.22

When using bleach, the use of gloves, a mask and eye protection is encouraged. Mix the solutions in well-ventilated areas, and use cold water, as hot water will decompose the active ingredient. It is important to never mix bleach with other chemicals and to remove all organic matter from items to be disinfected, as this too will inactivate the active ingredient.21 Items disinfected with bleach must be thoroughly rinsed with fresh water and allowed to dry before use, as it is corrosive to stainless steel (in higher concentrations) and irritating to mucous membranes, skin and eyes.20, 23 Highly concentrated bleach solutions have also been found to be harmful to life-support equipment, causing metal fatigue and in some cases hose failure during the Hart building anthrax attack. As such these solutions are not used by EPA units for dive equipment when effective alternatives exist.

Sabun dan Air

Mencuci tangan dan permukaan dengan sabun dan air adalah salah satu cara paling efektif untuk melindungi diri dari virus. Jenis sabun yang digunakan tidak penting. Mencuci dengan sabun dan air tidak membunuh mikroorganisme tetapi secara fisik menghilangkannya dari permukaan. Air yang mengalir dapat efektif dalam menghilangkan beberapa bahan yang tidak diinginkan dari permukaan, namun sabun secara fisik akan menarik material dari kulit dan masuk ke dalam air.24

Divers Alert Network ditanya mengapa sabun dan air tidak akan bekerja untuk peralatan scuba jika direkomendasikan untuk membersihkan tangan. Sabun dan air, sebagaimana dinyatakan di atas, harus dikombinasikan dengan tindakan mekanis agar benar-benar efektif. Merendam peralatan selam dalam air sabun saja bukanlah metode desinfeksi yang efektif. Jika air sabun digabungkan dengan tindakan mekanis, secara teori akan terbukti lebih efisien. Namun ada beberapa bagian peralatan selam yang tidak mudah dijangkau tanpa dibongkar, seperti bagian dalam regulator. Karena napas yang dihembuskan akan mengalir melalui bagian dalam regulator dan membuat kontak dengan diafragma, lengan tuas, dan permukaan internal lainnya, merendam regulator dalam larutan disinfektan mungkin merupakan pilihan yang lebih baik.

Pedoman EPA

No matter the active ingredient or method of disinfecting scuba equipment, proven efficacy against the novel coronavirus is of utmost importance. The EPA’s “List N” is a compilation of products that have proven efficacy against SARS-CoV-1 and will therefore also work to kill SARS-CoV-2. Outside of the United States, local governing bodies may also have registered disinfectants. Following the directions for use for each individual product will ensure its efficacy.

Ketika produsen produk mendaftarkan produk mereka ke EPA, mereka harus menyerahkan daftar kegunaan produk tersebut. Produk yang terdaftar di List N jarang mengandung kata “scuba”; yang lebih mungkin dicantumkan adalah respirator atau bahan yang terbuat dari peralatan scuba. Saat memilih larutan disinfektan dari List N, penting untuk memeriksa bahwa registrasi EPA produk menentukan penggunaannya untuk bahan yang dimaksud.

Beberapa produk yang biasanya direkomendasikan oleh produsen peralatan pernapasan bawah air diklasifikasikan sebagai pembersih amonium kuater yang terdaftar di EPA untuk digunakan dalam layanan makanan saja dan saat ini tidak ada dalam List N EPA. EPA tidak menganggap produk tersebut efektif melawan SARS-CoV-2 ketika diterapkan pada bahan dan permukaan tersebut.

Praktik Terbaik

When selecting a disinfectant, it is of utmost importance to use a product that has proven efficacy against either SARS-CoV-2 or the harder-to-kill SARS-CoV-1. Consult your local governing body’s pesticide registration system for its list of registered disinfectants if the products specified in the EPA’s List N are unavailable in your area. When using these products, be sure to follow the directions and use the specified personal protective equipment (such as gloves or eye protection) when disinfecting. If registered products cannot be found, be sure to use disinfection protocols outlined by the CDC.

Setelah mendisinfeksi peralatan, seseorang harus berhati-hati untuk tidak menginfeksi ulang peralatan, seperti dengan memegangnya saat menyimpan. Karyawan toko selam harus berhati-hati untuk menjaga kebersihan yang baik dengan sering mencuci tangan dan secara teratur mendisinfeksi area yang sering disentuh, termasuk stasiun pengisian bahan bakar (sebagaimana diuraikan dalam bagian "panas" dari artikel ini).

Terakhir, pertimbangkan untuk memperbarui rencana tindakan darurat Anda yang ada untuk memasukkan potensi infeksi COVID-19 oleh staf atau pelanggan. Pastikan untuk menguraikan semua protokol desinfeksi dan memastikan bahwa protokol tersebut diikuti dengan patuh oleh semua staf. Pertimbangan yang paling penting adalah kesehatan dan keselamatan staf dan pelanggan Anda.

Jika Anda memiliki pertanyaan, silakan kirim email kepada kami di .


Bergabung ke DAN


Daftar Pustaka

1 Coronavirus. World Health Organization. World Health Organization; [cited 2020Mar26].

2 Factsheet for health professionals on Coronaviruses. European Centre for Disease Prevention and Control. 2020 [cited 2020Mar26].

3 Lauer SA, Grantz KH, Bi QK, Jones FR, Zheng QS, Meredith HG, et al. The Incubation Period of Coronavirus Disease 2019 (COVID-19) From Publicly Reported Confirmed Cases: Estimation and Application. Annals of Internal Medicine. 2020Mar10.

4 Fehr AR, Perlman S. Coronaviruses: An Overview of Their Replication and Pathogenesis. Coronaviruses Methods in Molecular Biology. 2015; 1–23.

5 Chan KH, Peiris JSM, Lam SY, Poon LLM, Yuen KY, Seto WH. The Effects of Temperature and Relative Humidity on the Viability of the SARS Coronavirus. Advances in Virology. 2011Oct1;2011:1–7.

6 Disinfecting Your Home If Someone Is Sick. Centers for Disease Control and Prevention. Centers for Disease Control and Prevention; 2020 [cited 2020Mar26].

7 New coronavirus stable for hours on surfaces. National Institutes of Health. U.S. Department of Health and Human Services; 2020 [cited 2020Mar26].

8 Casanova L, Rutala WA, Weber DJ, Sobsey MD. Survival of surrogate coronaviruses in water. Water Research. 2009;43(7):1893–8.

9 Municipal Water and COVID-19. Centers for Disease Control and Prevention. Centers for Disease Control and Prevention; 2020 [cited 2020Mar26].

10 First data on stability and resistance of SARS coronavirus compiled by members of WHO laboratory network. World Health Organization. World Health Organization; 2015 [cited 2020Mar27].

11 Duan SM, Zhao XS, Wen RF, Huang JJ, Pi GH, Zhang SX, et al. Stability of SARS coronavirus in human specimens and environment and its sensitivity to heating and UV irradiation. Biomedical and Environmental Sciences. 2003Sep;16:246–55.

12 DiCaprio E, Ye M, Chen H, Li J. Inactivation of Human Norovirus and Tulane Virus by High Pressure Processing in Simple Mediums and Strawberry Puree. Frontiers in Sustainable Food systems; 2019 [cited 2020Mar27].

13 Lou F, Huang P, Neetoo H, Gurtler JB, Niemira BA, Chen H, et al. High-Pressure Inactivation of Human Norovirus Virus-Like Particles Provides Evidence that the Capsid of Human Norovirus Is Highly Pressure Resistant. Applied and Environmental Microbiology. 2012May25;78(15):5320–7.

14 Lou FB, Huang PA, Neetoo Hundefined, Gurtler Jundefined, Niemira Bundefined, Chen Hundefined, et al. High-Pressure Inactivation of Human Norovirus Virus-Like Particles Provides Evidence that the Capsid of Human Norovirus Is Highly Pressure Resistant. Applied and Environmental Microbiology. 2013Nov25;78(15):5320–7.

15 Gerba CP. Quaternary Ammonium Biocides: Efficacy in Application. Applied and Environmental Microbiology. 2014;81(2):464–9.

16 Dellanno C, Vega Q, Boesenberg D. The antiviral action of common household disinfectants and antiseptics against murine hepatitis virus, a potential surrogate for SARS coronavirus. American Journal of Infection Control. 2009Oct;37(8):649–52.

17 Laboratory biosafety guidance related to coronavirus disease 2019 (COVID-19): interim recommendations.

18 Zhang C, Cui F, Zeng G-M, Jiang M, Yang Z-Z, Yu Z-G, et al. Quaternary ammonium compounds (QACs): A review on occurrence, fate and toxicity in the environment. Science of The Total Environment. 2015Jun15;518-519:352–62.

19 Lycke E, Norrby E. Textbook of medical virology. London: Butterworths; 1983.

20 Annex G: Use of disinfectants: alcohol and bleach. Infection Prevention and Control of Epidemic- and Pandemic-Prone Acute Respiratory Infections in Health Care.

21 Kampf G, Todt D, Pfaender S, Steinmann E. Persistence of coronaviruses on inanimate surfaces and their inactivation with biocidal agents. Journal of Hospital Infection. 2020Mar;104(3):246–51.

22 Lai MYY, Cheng PKC, Lim WWL. Survival of Severe Acute Respiratory Syndrome Coronavirus. Clinical Infectious Diseases. 2005Oct1;41(7):e67–e71.

23 University of Nebraska Lincoln. CHEMICAL DISINFECTANTS FOR BIOHAZARDOUS MATERIALS.

24 Harvard Health Publishing. The handiwork of good health. Harvard Health. 2007 [cited 2020Mar26].

Indonesian