Only a few reports of laboratory-confirmed asymptomatic cases exist, but asymptomatic transmission has been detected by some countries during contact tracing investigations.
Kuna ripoti chache tu ya visa vilivyothibitishwa maabarani vya watu wasioonyesha dalili zozote ilhali wana virusi kuwepo, lakini visa vya watu walioambukizwa na wasioonyesha dalili zimetambuliwa na nchi zingine wakati wanafuatilia watu waliotangamana na wagonjwa.