 Mu kiganiro nabanyamakuru ku wa gatandatu, Jenerali Perna - wavugiraga itsinda rya leta yAmerika rishinzwe igikorwa cyikingira kizwi nka Operation Warp Speed - yavuze ko doze zurwo rukingo zishyirwa muri za kontineri zigatwarwa mu masaha 24 ari imbere. 