WHO ບໍ່ໄດ້ແນະນຳໃຫ້ໃສ່ໜ້າກາກອະນາໄມໂດຍທົ່ວໄປສຳລັບຄົນທີ່ມີສຸຂະພາບດີ. ເຖິງຢ່າງໃດກໍ່ຕາມ, ດຽວນີ້ CDC ໄດ້ວາງແນວທາງ ໃໝ່ ແລະກ່າວວ່າ "ປະຊາຊົນຄວນໃສ່ຜ້າອັດດັງໃນເວລາທີ່ພວກເຂົາອອກໄປຂ້າງນອກ". ຫຼັກຖານໃຫມ່ແນະນໍາວ່າການນໍາໃຊ້ຫນ້າກາກໃບຫນ້າໃນການຜ່າຕັດສາມາດປ້ອງກັນການແຜ່ກະຈາຍຂອງໂຣກ coronaviruses ຂອງມະນຸດແລະເຊື້ອໄວຣັສໄຂ້ຫວັດໃຫຍ່ຈາກບຸກຄົນທີ່ມີອາການ.
Covid-19 ເຊື້ອໄວຣັສ ມີຢູ່ໃນລົມຫາຍໃຈຫາຍໃຈແລະໄອຂອງຜູ້ຕິດເຊື້ອແລະແຜ່ລາມຜ່ານທໍ່ອາກາດທີ່ມາຈາກຄົນທີ່ໄອແລະຈາມ.
ມີການໂຕ້ວາທີກ່ຽວກັບປະສິດທິພາບຂອງ ຫນ້າກາກໃບຫນ້າ in reducing spread of the ເຊື້ອໄວຣັສ. The international body WHO doesn’t recommend them generally to the healthy people. However, CDC has now laid down new guideline and say ”people should wear cloth masks when they go outside”.
In the brief communication published in Nature Medicine on 03 April 2020, the researchers found that the usage of surgical face masks could prevent spread of human coronaviruses and influenza ໄວຣັສ from symptomatic individuals.
ລະບົບຫາຍໃຈ ເຊື້ອໄວຣັສ infections spread between human beings through contact, respiratory droplets and fine-particle aerosols. However, there are uncertainties around modes of transmission of COVID-19.
In this study, the researchers quantified the amount of ເຊື້ອໄວຣັສ in exhaled breath of participants and determined the potential efficacy of surgical face masks in preventing the transmission. Of 3,363 screened individuals, 246 individuals provided exhaled breath samples The 50% participants were randomized to ‘not wearing a face mask’ during the exhaled breath collection and the rest were randomized to ‘wearing a face mask’. They tested viral shedding in nasal swabs, throat swabs, respiratory droplet samples and aerosol samples and compared the latter two between samples collected with or without a face mask.
They found viral shedding to be higher in nasal swabs than in throat swabs. Further, they detected ໂຣກ coronavirus in 30-40% samples collected from participants without face masks but no ເຊື້ອໄວຣັສ was detected in droplets and aerosols collected from patients wearing face masks.
This study demonstrated the efficacy of surgical masks in reducing coronavirus detection and viral copies in respiratory droplets and in aerosols suggesting that the surgical face masks could be used by ill people to reduce onward transmission of the ເຊື້ອໄວຣັສ.
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ກະສານອ້າງອີງ:
Leung, N.H.L., Chu, D.K.W., Shiu, E.Y.C. et al. Respiratory ເຊື້ອໄວຣັສ shedding in exhaled breath and efficacy of face masks. Published on 03 April 2020. Nature Medicine (2020). DOI: https://doi.org/10.1038/s41591-020-0843-2
