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Ukujonga ukuba sisasazeka kangakanani na isifo esosulelayo esifana ne-COVID-19, iingcali ze-epidemiologists zisebenzisa i-metric ebizwa ngokuba yi- basic reproductive number okanye i-R0 (ebizwa ngokuba “yi-R naught”). I-R0 yi-avareji yenani labantu abasesichengeni ekulindeleke ukuba abosuleleke ngumntu ngamnye owosulelekileyo. Kunzima ukuqiniseka nge-R0 yendyikityha yamandulo, kodwa kwindyikityha yomkhuhlane ka-1918, umndilili wosulelo kucingelwa ukuba wasidlulisela esi sifo phakathi kwabantu ababini ukuya kwabathathu, nto leyo enika i-R0 phakathi kwe-2.0 kunye ne-3.0. Ubhubhani wokuqala we-SARS we-coronavirus ka-2002, une-R0 kwezithathu; kwi-coronavirus yesibini epidemic-Middle East Respiratory Syndrome (MERS) okokuqala ichongiwe ngo-2012-R0 yayiphakathi kwe-0.69 ukuya kwi-1.3.Oonodoli be-Anime Sex

Ngoku i-CDC iqikelela ukuba abantu abosulelwe yiDelta bayidlulisela intsholongwane phakathi kwabantu abahlanu kunye ne-9.5. Oku kuphezulu kunentsholongwane yokuqala echongiweyo e-Wuhan, e-China, eyayine-R0 phakathi kwe-2.3 kunye ne-2.7, kunye nokwahluka kwe-Alpha eyayine-R0 phakathi kwe-4 ne-5. I-Delta inosulelo njengerhashalala, ene-R0 phakathi kwe-9 kunye ne-10.

Ukuba i-R0 inkulu kunomnye, inani labantu abosulelekileyo liyakuhlala likhula ngokukhawuleza bade bonke abantu abasesichengeni babhubhile okanye bachacha kwaye kufikeleleke kukhuseleko lomhlambi. Ukuba i-R0 ingaphantsi kwenye uqhambuko luya kuziphumela ngokwalo.Oonodoli beSex kuMadoda

Kwi-SARS-CoV-2 yantlandlolo, ukungakhuseleki komhlambi kunokufikelelwa xa malunga neepesenti ezingama-67 zabemi bengakhuselekanga-nokuba kungosulelo lwendalo okanye ugonyo. "KwiDelta, le miqobo siqikelela ukuba ingaphezulu kweepesenti ezingama-80, mhlawumbi isondela kwiipesenti ezingama-90," utshilo uRicardo Franco, unjingalwazi oncedisayo kwezamayeza kwiYunivesithi yaseAlabama eBirmingham kwingxelo yabezindaba ebiququzelelwe nguMbutho weZifo ezosulelayo eMelika.