Nurse Roy Christian receives the Covid-19 vaccine at John Sealy Hospital at the University of Texas Medical Branch in Galveston, Texas on December 15, 2020.Coronavirus variants threaten to upend pandemic progress. Here's how 4 top vaccine makers are fighting back.
The emergence of coronavirus variants threatens to lower the efficacy of COVID-19 vaccines and extend the pandemic's trajectory. A barrage of data released in January showed a variant widely circulating in South Africa is particularly troubling.
हमने इस समाचार को संक्षेप में प्रस्तुत किया है ताकि आप इसे तुरंत पढ़ सकें। यदि आप समाचार में रुचि रखते हैं, तो आप पूरा पाठ यहां पढ़ सकते हैं। और पढो: