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The World Health Organization has designated both Alpha and Delta variants as "variants of concern." 

In last 3 months, Delta strain detected in 80% samples sent for genome sequencing in Delhi

The vaccine also stimulated long-lasting immune responses the researchers said, adding booster shots seems unnecessary at this time.

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In last 3 months, Delta strain detected in 80% samples sent for genome sequencing in Delhi

Johnson & Johnson says single shot of its Covid vaccine is effective against Delta Variant