Jami’an kiwon lafiya a Amurka sun fada jiya Laraba cewa, kusan 1 cikin 5 na Amurkawa manya da suka bada rahoton kamuwa da cutar COVID-19 a baya, har yanzu suna fama da alamomin COVID din na dogon lokaci, bisa ga bayanan bincike da aka tattara a cikin makonnin biyun farkon watan Yuni da ya gabata.