<style>/*<link href='https://www.blogger.com/dyn-css/authorization.css?targetBlogID=1070140901707657057&zx=9ffa56d4-df66-477f-9282-25d03b2364c0' media='none' onload='if(media!='all')media='all'' rel='stylesheet'/><noscript><link href='https://www.blogger.com/dyn-css/authorization.css?targetBlogID=1070140901707657057&zx=9ffa56d4-df66-477f-9282-25d03b2364c0' rel='stylesheet'/></noscript>
<meta name='google-adsense-platform-account' content='ca-host-pub-1556223355139109'/>
<meta name='google-adsense-platform-domain' content='blogspot.com'/>

</head><body>*/</style>

Covid: Masks upgrade cuts infection risk, research finds

Emma Denson

29 يونيو, 2021

Covid: Masks upgrade cuts infection risk, research finds https://ift.tt/eA8V8J Wearing a high grade FFP3 mask can almost entirely protect health workers from Covid, research finds. https://ift.tt/3A5oFtg

Add Comment

<style>/*
<script type="text/javascript" src="https://www.blogger.com/static/v1/widgets/344097953-widgets.js"></script>
<script type='text/javascript'>
window['__wavt'] = 'AAVkm1tm0HovLGF6-Xgw4ULunbwk:1777655276429';_WidgetManager._Init('//www.blogger.com/rearrange?blogID\x3d1070140901707657057','//weight-loss-tiiips.blogspot.com/2021/06/covid-masks-upgrade-cuts-infection-risk.html','1070140901707657057');
_WidgetManager._SetDataContext([{'name': 'blog', 'data': {'blogId': '1070140901707657057', 'title': '\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645', 'url': 'https://weight-loss-tiiips.blogspot.com/2021/06/covid-masks-upgrade-cuts-infection-risk.html', 'canonicalUrl': 'https://weight-loss-tiiips.blogspot.com/2021/06/covid-masks-upgrade-cuts-infection-risk.html', 'homepageUrl': 'https://weight-loss-tiiips.blogspot.com/', 'searchUrl': 'https://weight-loss-tiiips.blogspot.com/search', 'canonicalHomepageUrl': 'https://weight-loss-tiiips.blogspot.com/', 'blogspotFaviconUrl': 'https://weight-loss-tiiips.blogspot.com/favicon.ico', 'bloggerUrl': 'https://www.blogger.com', 'hasCustomDomain': false, 'httpsEnabled': true, 'enabledCommentProfileImages': true, 'gPlusViewType': 'FILTERED_POSTMOD', 'adultContent': false, 'analyticsAccountNumber': 'UA-186432337-1', 'encoding': 'UTF-8', 'locale': 'ar', 'localeUnderscoreDelimited': 'ar', 'languageDirection': 'rtl', 'isPrivate': false, 'isMobile': false, 'isMobileRequest': false, 'mobileClass': '', 'isPrivateBlog': false, 'isDynamicViewsAvailable': true, 'feedLinks': '\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645 - Atom\x22 href\x3d\x22https://weight-loss-tiiips.blogspot.com/feeds/posts/default\x22 /\x3e\n\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/rss+xml\x22 title\x3d\x22\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645 - RSS\x22 href\x3d\x22https://weight-loss-tiiips.blogspot.com/feeds/posts/default?alt\x3drss\x22 /\x3e\n\x3clink rel\x3d\x22service.post\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645 - Atom\x22 href\x3d\x22https://www.blogger.com/feeds/1070140901707657057/posts/default\x22 /\x3e\n\n\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645 - Atom\x22 href\x3d\x22https://weight-loss-tiiips.blogspot.com/feeds/6614140294665678334/comments/default\x22 /\x3e\n', 'meTag': '', 'adsenseHostId': 'ca-host-pub-1556223355139109', 'adsenseHasAds': false, 'adsenseAutoAds': false, 'boqCommentIframeForm': true, 'loginRedirectParam': '', 'view': '', 'dynamicViewsCommentsSrc': '//www.blogblog.com/dynamicviews/4224c15c4e7c9321/js/comments.js', 'dynamicViewsScriptSrc': '//www.blogblog.com/dynamicviews/857ada52b5268eeb', 'plusOneApiSrc': 'https://apis.google.com/js/platform.js', 'disableGComments': true, 'interstitialAccepted': false, 'sharing': {'platforms': [{'name': '\u0627\u0644\u062d\u0635\u0648\u0644 \u0639\u0644\u0649 \u0627\u0644\u0631\u0627\u0628\u0637', 'key': 'link', 'shareMessage': '\u0627\u0644\u062d\u0635\u0648\u0644 \u0639\u0644\u0649 \u0627\u0644\u0631\u0627\u0628\u0637', 'target': ''}, {'name': 'Facebook', 'key': 'facebook', 'shareMessage': '\u0645\u0634\u0627\u0631\u0643\u0629 \u0625\u0644\u0649 Facebook', 'target': 'facebook'}, {'name': '\u0643\u062a\u0627\u0628\u0629 \u0645\u062f\u0648\u0646\u0629 \u062d\u0648\u0644 \u0647\u0630\u0647 \u0627\u0644\u0645\u0634\u0627\u0631\u0643\u0629', 'key': 'blogThis', 'shareMessage': '\u0643\u062a\u0627\u0628\u0629 \u0645\u062f\u0648\u0646\u0629 \u062d\u0648\u0644 \u0647\u0630\u0647 \u0627\u0644\u0645\u0634\u0627\u0631\u0643\u0629', 'target': 'blog'}, {'name': 'X', 'key': 'twitter', 'shareMessage': '\u0645\u0634\u0627\u0631\u0643\u0629 \u0625\u0644\u0649 X', 'target': 'twitter'}, {'name': 'Pinterest', 'key': 'pinterest', 'shareMessage': '\u0645\u0634\u0627\u0631\u0643\u0629 \u0625\u0644\u0649 Pinterest', 'target': 'pinterest'}, {'name': '\u0628\u0631\u064a\u062f \u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a', 'key': 'email', 'shareMessage': '\u0628\u0631\u064a\u062f \u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a', 'target': 'email'}], 'disableGooglePlus': true, 'googlePlusShareButtonWidth': 0, 'googlePlusBootstrap': '\x3cscript type\x3d\x22text/javascript\x22\x3ewindow.___gcfg \x3d {\x27lang\x27: \x27ar\x27};\x3c/script\x3e'}, 'hasCustomJumpLinkMessage': false, 'jumpLinkMessage': '\u0642\u0631\u0627\u0621\u0629 \u0627\u0644\u0645\u0632\u064a\u062f', 'pageType': 'item', 'postId': '6614140294665678334', 'pageName': 'Covid: Masks upgrade cuts infection risk, research finds', 'pageTitle': '\u0627\u062e\u0628\u0627\u0631 \u0627\u062e\u0631 \u0627\u0644\u064a\u0648\u0645: Covid: Masks upgrade cuts infection risk, research finds', 'metaDescription': ''}}, {'name': 'features', 'data': {}}, {'name': 'messages', 'data': {'edit': '\u062a\u0639\u062f\u064a\u0644', 'linkCopiedToClipboard': '\u062a\u0645 \u0646\u0633\u062e \u0627\u0644\u0631\u0627\u0628\u0637 \u0625\u0644\u0649 \u0627\u0644\u062d\u0627\u0641\u0638\u0629', 'ok': '\u062d\u0633\u0646\u064b\u0627', 'postLink': '\u0631\u0627\u0628\u0637 \u0627\u0644\u0645\u0634\u0627\u0631\u0643\u0629'}}, {'name': 'template', 'data': {'name': 'custom', 'localizedName': '\u0645\u062e\u0635\u0635', 'isResponsive': true, 'isAlternateRendering': false, 'isCustom': true}}, {'name': 'view', 'data': {'classic': {'name': 'classic', 'url': '?view\x3dclassic'}, 'flipcard': {'name': 'flipcard', 'url': '?view\x3dflipcard'}, 'magazine': {'name': 'magazine', 'url': '?view\x3dmagazine'}, 'mosaic': {'name': 'mosaic', 'url': '?view\x3dmosaic'}, 'sidebar': {'name': 'sidebar', 'url': '?view\x3dsidebar'}, 'snapshot': {'name': 'snapshot', 'url': '?view\x3dsnapshot'}, 'timeslide': {'name': 'timeslide', 'url': '?view\x3dtimeslide'}, 'isMobile': false, 'title': 'Covid: Masks upgrade cuts infection risk, research finds', 'description': '\u0627\u062e\u0628\u0627\u0631, \u0631\u064a\u0627\u0636\u0629, \u0635\u062d\u0629 \u0648\u062c\u0645\u0627\u0644, \u0627\u062e\u0628\u0627\u0631 \u062a\u0642\u0646\u064a\u0629', 'url': 'https://weight-loss-tiiips.blogspot.com/2021/06/covid-masks-upgrade-cuts-infection-risk.html', 'type': 'item', 'isSingleItem': true, 'isMultipleItems': false, 'isError': false, 'isPage': false, 'isPost': true, 'isHomepage': false, 'isArchive': false, 'isLabelSearch': false, 'postId': 6614140294665678334}}, {'name': 'widgets', 'data': [{'title': 'Upload Image', 'type': 'Image', 'sectionId': 'upload-image', 'id': 'Image10'}, {'title': 'Logo', 'type': 'HTML', 'sectionId': 'header-main', 'id': 'HTML10'}, {'title': 'Icons, Dark, Search', 'type': 'LinkList', 'sectionId': 'header-main', 'id': 'LinkList10'}, {'title': 'Menu', 'type': 'LinkList', 'sectionId': 'header-main', 'id': 'LinkList11'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'before-blog', 'id': 'HTML11'}, {'title': 'Featured Post', 'type': 'FeaturedPost', 'sectionId': 'before-blog', 'id': 'FeaturedPost1', 'postId': '9078737697543515519'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'before-post', 'id': 'HTML12'}, {'title': '\u0631\u0633\u0627\u0626\u0644 \u0627\u0644\u0645\u062f\u0648\u0646\u0629 \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a\u0629', 'type': 'Blog', 'sectionId': 'blog-post', 'id': 'Blog1', 'posts': [{'id': '6614140294665678334', 'title': 'Covid: Masks upgrade cuts infection risk, research finds', 'showInlineAds': false}], 'headerByline': {'regionName': 'header1', 'items': [{'name': 'share', 'label': ''}, {'name': 'author', 'label': '\u0628\u0648\u0627\u0633\u0637\u0629'}, {'name': 'timestamp', 'label': 'd MMM, yyyy'}]}, 'footerBylines': [{'regionName': 'footer1', 'items': [{'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}]}, {'regionName': 'footer2', 'items': [{'name': 'labels', 'label': ''}]}], 'allBylineItems': [{'name': 'share', 'label': ''}, {'name': 'author', 'label': '\u0628\u0648\u0627\u0633\u0637\u0629'}, {'name': 'timestamp', 'label': 'd MMM, yyyy'}, {'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}, {'name': 'labels', 'label': ''}]}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML13'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML14'}, {'title': '#You may also like', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML15'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML16'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML17'}, {'title': 'Popular Posts', 'type': 'PopularPosts', 'sectionId': 'sidebar-static', 'id': 'PopularPosts10', 'posts': []}, {'title': 'Categories', 'type': 'Label', 'sectionId': 'sidebar-static', 'id': 'Label10'}, {'title': 'Hashtag', 'type': 'Label', 'sectionId': 'sidebar-static', 'id': 'Label11'}, {'title': 'Blog Archive', 'type': 'BlogArchive', 'sectionId': 'sidebar-static', 'id': 'BlogArchive10'}, {'title': '#Recent Post', 'type': 'HTML', 'sectionId': 'sidebar-static', 'id': 'HTML19'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'sidebar-sticky', 'id': 'HTML20'}, {'title': 'About Us', 'type': 'HTML', 'sectionId': 'footer-widget', 'id': 'HTML21'}, {'title': 'Learn More', 'type': 'LinkList', 'sectionId': 'footer-widget', 'id': 'LinkList13'}, {'title': 'Follow Us', 'type': 'LinkList', 'sectionId': 'footer-widget', 'id': 'LinkList14'}, {'title': 'Newsletter', 'type': 'HTML', 'sectionId': 'footer-widget', 'id': 'HTML22'}, {'title': 'Copyright', 'type': 'HTML', 'sectionId': 'copyright', 'id': 'HTML23'}, {'title': 'SVG Icons', 'type': 'HTML', 'sectionId': 'jet-options', 'id': 'HTML24'}]}]);
_WidgetManager._RegisterWidget('_ImageView', new _WidgetInfo('Image10', 'upload-image', document.getElementById('Image10'), {'resize': false}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML10', 'header-main', document.getElementById('HTML10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList10', 'header-main', document.getElementById('LinkList10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList11', 'header-main', document.getElementById('LinkList11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML11', 'before-blog', document.getElementById('HTML11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_FeaturedPostView', new _WidgetInfo('FeaturedPost1', 'before-blog', document.getElementById('FeaturedPost1'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML12', 'before-post', document.getElementById('HTML12'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_BlogView', new _WidgetInfo('Blog1', 'blog-post', document.getElementById('Blog1'), {'cmtInteractionsEnabled': false, 'lightboxEnabled': true, 'lightboxModuleUrl': 'https://www.blogger.com/static/v1/jsbin/3943208901-lbx__ar.js', 'lightboxCssUrl': 'https://www.blogger.com/static/v1/v-css/828616780-lightbox_bundle_rtl.css'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML13', 'ads-post', document.getElementById('HTML13'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML14', 'ads-post', document.getElementById('HTML14'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML15', 'ads-post', document.getElementById('HTML15'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML16', 'ads-post', document.getElementById('HTML16'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML17', 'ads-post', document.getElementById('HTML17'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_PopularPostsView', new _WidgetInfo('PopularPosts10', 'sidebar-static', document.getElementById('PopularPosts10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LabelView', new _WidgetInfo('Label10', 'sidebar-static', document.getElementById('Label10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LabelView', new _WidgetInfo('Label11', 'sidebar-static', document.getElementById('Label11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_BlogArchiveView', new _WidgetInfo('BlogArchive10', 'sidebar-static', document.getElementById('BlogArchive10'), {'languageDirection': 'rtl', 'loadingMessage': '\u200f\u062c\u0627\u0631\u064d \u0627\u0644\u062a\u062d\u0645\u064a\u0644\x26hellip;'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML19', 'sidebar-static', document.getElementById('HTML19'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML20', 'sidebar-sticky', document.getElementById('HTML20'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML21', 'footer-widget', document.getElementById('HTML21'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList13', 'footer-widget', document.getElementById('LinkList13'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList14', 'footer-widget', document.getElementById('LinkList14'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML22', 'footer-widget', document.getElementById('HTML22'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML23', 'copyright', document.getElementById('HTML23'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML24', 'jet-options', document.getElementById('HTML24'), {}, 'displayModeFull'));
</script>
</body>*/</style>