For Covid-19 Vaccine Doses, may still There Be more Time Between shots?

recent studies have proven that the effectiveness of Covid-19 vaccines is reducing, although consultants say the shots nonetheless work well. WSJ explains what the numbers mean and why they don't inform the total story. image illustration: Jacob Reynolds/WSJ

Two-dose vaccines are typically spaced months and sometimes years aside to deliver long-lasting coverage from disorder. As infants start to get their Covid-19 photographs, emerging research in adults means that waiting longer between doses may have an identical benefits.