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Txhawm rau taug qab cov kab mob sib kis tau yooj yim xws li covid-19 kis, Epidemiologists siv lub teeb meem hu ua tus lej sib tw hu ua tus lej sib tw ua haujlwm lossis R0 (hais "r naught"). R0 yog cov neeg muaj feem ntau ntawm cov neeg tau kis tau tias txhua tus neeg muaj tus kab mob yuav tsum mob. Nws yog qhov nyuaj rau kom muaj tseeb txog R0 rau cov neeg muaj kabmob Pandemics, tab sis rau tus neeg mob kis rau xyoo 1918, muab qhov R0 ntawm 2.0 thiab 3.0. Thawj cov silars Coronavirus phaum ntawm 2002, muaj ib qho R0 ntawm peb; Rau ob lub coronavirus phaum ntawm sab hnub tuaj ua pa (mids) thawj zaug txheeb tau hauv 2012-R0 yog nyob ntawm 0.69 txog 1.3.Anime shopping

Tam sim no daim CDC kwv yees tias cov neeg kis tus kab mob tom qab tus kab mob mus txog ntawm tsib thiab 9.5 tib neeg. Qhov no siab dua tus kab mob thawj pom tau txheeb xyuas hauv Wuhan, Suav, uas muaj R0 ntawm 2.3 thiab 2.7, thiab lub Alpha variant uas muaj R0 ntawm plaub thiab tsib. Delta tuaj yeem sib kis tau li kis qaib pox, uas muaj R0 nruab nrab ntawm 9 thiab 10.Realistic Sing Dolls

Yog tias R0 loj dua ib qho, tus naj npawb ntawm cov kab mob uas tau loj hlob mus txog thaum txhua tus neeg tau tuag los yog rov qab tau txais kev tiv thaiv tsiaj. Yog tias R0 tsawg dua ib qho kev tshwm sim yuav fizzle tawm ntawm nws tus kheej.Sex roj hmab rau txiv neej

Rau thawj SARS-COV-2, Herd txhaj tshuaj tiv thaiv tuaj yeem hu tau thaum nyob ib ncig ntawm 67 feem pua ​​ntawm cov pej xeem raug txhaj tshuaj lossis txhaj tshuaj tiv thaiv kab mob. "Rau Delta, cov kwv yees cov kwv yees tau zoo tshaj li 80 feem pua," Ricardo Franco, "Ricardo Franko, tus kws tshaj lij ntawm kev sib kis hauv zej zog ntawm Asmeskas.