Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the chaty domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home1/express/public_html/wp-includes/functions.php on line 6131

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the redux-framework domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home1/express/public_html/wp-includes/functions.php on line 6131

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the redux-framework domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home1/express/public_html/wp-includes/functions.php on line 6131

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the wp-plugin-hostgator domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home1/express/public_html/wp-includes/functions.php on line 6131

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the wp-plugin-hostgator domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home1/express/public_html/wp-includes/functions.php on line 6131

Deprecated: Return type of Recursive_ArrayAccess::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home1/express/public_html/wp-content/plugins/youtube-showcase/assets/ext/emd-session/includes/class-recursive-arrayaccess.php on line 76

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Deprecated: Return type of Recursive_ArrayAccess::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home1/express/public_html/wp-content/plugins/youtube-showcase/assets/ext/emd-session/includes/class-recursive-arrayaccess.php on line 202

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Deprecated: Creation of dynamic property Redux_Text::$field is deprecated in /home1/express/public_html/wp-content/plugins/woo-iqonic-api/redux-framework/redux-core/inc/classes/class-redux-field.php on line 160

Deprecated: Creation of dynamic property Redux_Text::$select2_config is deprecated in /home1/express/public_html/wp-content/plugins/woo-iqonic-api/redux-framework/redux-core/inc/classes/class-redux-field.php on line 163

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Deprecated: Creation of dynamic property Redux_Text::$select2_config is deprecated in /home1/express/public_html/wp-content/plugins/woo-iqonic-api/redux-framework/redux-core/inc/classes/class-redux-field.php on line 163

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Deprecated: Creation of dynamic property Redux_Text::$select2_config is deprecated in /home1/express/public_html/wp-content/plugins/woo-iqonic-api/redux-framework/redux-core/inc/classes/class-redux-field.php on line 163

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دراسة تحذر: "كورونا المتحور" يتضاعف بأميركا كل 10 أيام - Algerian Express

دراسة تحذر: “كورونا المتحور” يتضاعف بأميركا كل 10 أيام


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ألجيريان إكسبرس: توصلت دراسة جديدة إلى أن السلالة الجديدة من فيروس كورونا المستجد، الأكثر قابلية للانتقال والتي نشأت في المملكة المتحدة، تتضاعف في الولايات المتحدة كل 10 أيام.

الدراسة، التي نشرت في مجلة “ميدريكسفي”، ومولتها جهات عدة، بينها المراكز الأميركية لمكافحة الأمراض والوقاية منها، ولم تخضع بعد لتقييم باحثين مستقلين، وجدت أن سلالة الفيروس المتحور أكثر قابلية للانتقال بنسبة 35-45 بالمئة من السلالة الأصلية المنتشرة في الولايات المتحدة.

وحذر الباحثون من أن هذه السلالة “ستكون لها على الأرجح عواقب وخيمة من حيث الوفيات ومعدل انتشار كوفيد-19 في الولايات المتحدة في غضون بضعة أشهر، ما لم يتم اتخاذ إجراء حاسم وفوري في مجال الصحة العامة”.

وقام عشرات الباحثين بجمع وتحليل عينات إيجابية لكوفيد-19 من عموم أنحاء الولايات المتحدة، لقياس سرعة انتقال وتفشي عدوى السلالة الجديدة، بشكل أفضل.

وجرى اختبار نحو نصف مليون عينة في مختبرات شركة “هيليكس إنداستريز” في ولاية نيوجيرزي، منذ يوليو 2020، لكن العلماء بدأوا النظر في السلالة البريطانية في أوائل أكتوبر 2020، مستعينين بنسبة 0.2 بالمئة من عينات إيجابية لها ذات البنية الجينية التي اكتشفت في البروتين السطحي للطفرة الجديدة.

ووجد الباحثون أن نسبة العينات التي تطابقت مع السلالة البريطانية والمعروفة باسم B.1.1.7، ارتفعت في الولايات المتحدة بشكل مطرد خلال شهر يناير، من متوسط 0.8 بالمئة في الأسبوع الأول، إلى 4.2 بالمئة في الأسبوع الأخير من الشهر نفسه، ما يشير إلى ارتفاع مستوى انتقال الفيروس ونموه بين السكان.

ولفتت الدراسة إلى أنه “بالنظر إلى المسار الحالي للسلالة البريطانية، فمن المؤكد تقريبا أن تصبح مهيمنة في العديد من الولايات الأميركية، بحلول مارس 2021”.

وبناء على العينات الإيجابية التي تم تتبعها في الدراسة، فإن السلالة الجديدة، اكتشفت عدة مرات في نوفمبر 2020، مع العثور مجموعتين كبيرتين في ولايتي فلوريدا وكاليفورنيا.

ودفع العثور على حالات في ولايات أخرى، بما في ذلك نورث كارولينا وجورجيا وتكساس، الباحثين، إلى الاعتقاد بأن سلالة B.1.1.7 كانت تتفشى في جميع أنحاء البلاد منذ أواخر عام 2020.

ورجح الباحثون أن تكون السلالة دخلت إلى الولايات المتحدة من خلال السفر الدولي، إضافة إلى انتقال ملايين الأميركيين عبر أرجاء البلاد في عطلات عيد الشكر وعيد الميلاد ورأس السنة خلال فصلي الخريف والشتاء.

وعلى الرغم من انخفاض معدلاته في الولايات المتحدة مقارنة ببعض الدول الأوروبية، إلا أن الباحثين يتوقعون أن ينمو المتحور B.1.1.7، ليصبح سلالة كوفيد-19 السائدة في الولايات المتحدة، مدفوعا بشكل أساسي، بالتفشي المجتمعي.

واختتم المؤلفون بالإشارة إلى أن المراقبة المستمرة للفيروسات، هي مفتاح لتتبع ومعالجة طفرات كوفيد-19.

وبالتزامن مع انتشار أخبار طفرات كوفيد-19 المختلفة في جميع أنحاء العالم، يتطلع مطورو اللقاحات إلى تعديل التطعيمات لتوفير الحماية ضد متغيرات الفيروس المتعددة، وتقديم عقاقير معززة، لسد أي نقص في اللقاحات الحالية.

وتشير دراسات حديثة أجرتها شركة فايزر، إلى أن الطفرات كانت لها آثار محدودة فقط على كمية الأجسام المضادة التي ينتجها لقاحها، في حين تعمل شركة مودرنا حاليا على تطوير جرعة معززة للمساعدة في محاربة أي متغيرات جديدة.

ALGERIAN EXPRESS

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سكاي نيوز عربية
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