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Mediterranean Journal of Infection, Microbes and Antimicrobials ; 10, 2021.
Article in English | EMBASE | ID: covidwho-1344487


Introduction: The effectivity of cloth masks is one of the major concerns during pandemic. In this study, the filtration ability of different cloth masks was compared. Materials and Methods: We examined the filtration ability of different cloth masks in "Touch Screen Aerosol Photometer"DOP3500 machine by testing 0,3-0,5 μm diameter standart "aerosol"particle at mask factory (MAKSAM) of Mechanical and Chemical Industry Company located in Ankara. In order to show the difference in filtration ability of the cloth maskes clearly, particule size was defined as 0,3-0,5 μm. Pure silk 100%, 80% silk + 20% polyester, 100% satin, 100% polyester, 100% cotton, 100% bamboo and 50% cotton + 50% polyester were compared. Cloth masks made from these materials were tested three times;before washing, after ten times washing and combined using with a medical mask. Results: N95/FFP-2 respirator was used as a "positive control"with a filtration ability of 99.7%. Measurable filtration ability of total particle counts was 18.2% of three layered medical mask. When we tested double medical mask, reduction of total particle counts reached to 31.6%. According to our result, we conclude that wearing double medical mask is more protective than wearing a single medical mask. Measureable reduction of total particle counts were different for all tested cloth masks. Cloth masks were tested second time after 10 times washing. Un-washed cloth mask made from 80% silk + 20% polyester was found to be protective, however after ten times washing particle counts of the same mask reduced markedly. Measurable reduction of total particle counts were also reduced after ten times washing of cloth masks made from 100% satin and 100% polyester. The most efficient cloth mask for blocking particules was 100% cotton after ten times washing. Conclusion: Our study offers evidence in favor of synthetic and polyester materials are not suitable for cloth masks since their filtration ability is reduced after multiple washing. Instead, use of cotton masks is more preventive than the others because of its increased filtration ability after washing. Combined wearing of medical mask and cloth mask together resulted in increased efficacy of filtration ability of both masks. We conclude that, wearing double mask is more effective than wearing a single mask when we consider the actual status of the pandemic with widespread distribution of mutant viruses and the high number of infected individuals in the public.

Gazi Medical Journal ; 32(2):213-218, 2021.
Article in English | Web of Science | ID: covidwho-1257156


Objective: The aim of the study is to compare the differences between COVID-19 pneumonia and other viral pneumonia (OVP) in terms of demographic, clinical and radiological features. Methods: This retrospective cohort study was conducted in Gazi University Hospital between 11 March and 24 May 2020. Patients, admitted to the hospital with suspected COVID-19 infection aged >18 years and those who had pneumonia on chest computed tomography (CT) scan were evaluated. SARS-CoV-2 RT-PCR and multiplex PCR, for other respiratory viruses, were performed. Patients with a positive SARS-CoV-2 PCR were included in "COVID-19 pneumonia" group and those who had a positive result for any other respiratory viruses and two consecutive negative results for SARS-CoV-2 were included in the "OVP" group. Two groups were compared in terms of clinical, laboratory and chest CT findings. Results: Of the 63 patients included in the study, 45 had COVID-19 pneumonia and 18 had OVP. Cough, nasal congestion, sputum production and leukocytosis were more common in the OVP group while leukopenia was more common in the COVID-19 pneumonia (p<0.05). The distribution pattern of parenchymal lesions on chest CT was more likely to be predominantly peripheral and posterior in COVID-19 pneumonia compared to OVP. Bilateral involvement was also more frequent in COVID-19 group compared to OVP (p<0.05). Conclusion: Distinguishing COVID-19 pneumonia from OVP with clinical and laboratory findings is difficult. Chest CT findings such as peripheral and posterior distribution of the parenchymal lesions and bilateral involvement may help to differentiate COVID-19 pneumonia from OVP.