Mu kiganiro n'abanyamakuru ku wa gatandatu, Jenerali Perna - wavugiraga itsinda rya leta y'Amerika rishinzwe igikorwa cy'ikingira kizwi nka Operation Warp Speed - yavuze ko doze z'urwo rukingo zishyirwa muri za kontineri zigatwarwa "mu masaha 24 ari imbere".
