Most of the transmissions caused by the primary infected persons are terminated after the first transmission. There is one case who came back form Beijing transmit the pathogen for three generations. The relationship between the infected person and the contact one is described from the angle of the later, e.g. case 32 is the wife of case 7. As to the common infectious source or the two persons cannot be identified who actual transmitted the pathogen, the relationship is described with the little sequence of the case and infected persons. For example, case 18 is aunt of case 24, while case 28 is grandmother of case 24. UN: uncle; AU: aunt; CCP: common contact person; CW: co-worker; DA: daughter; EBW: elder brother’s wife; FA: father; FIL: father-in-law; FR: friend; GF: grandfather; GG: great-grandmother; GM: grandmother; HU: husband; YS: younger sister; MO: mother; NI: niece; RE: relative; SIL: sister-in-law; SON: son; SP: spouse; YBW: younger brother’s wife; YS: younger sister.
Figure 1: The panorama of SARS-Cov-2 transmission of 52 cases in Jining City, China