传染

to infect / contagious

to pass on / to spread / to transmit / to infect / to transfer / to circulate / to conduct (electricity)

biography / historical narrative / commentaries / relay station

to dye / to catch (a disease) / to acquire (bad habits etc) / to contaminate / to add color washes to a painting

infectious disease / contagious disease / pestilence

infectious; contagious / infectiousness; transmissibility

source of an infection

droplet infection (disease transmission from sneezing, coughing etc)

epidemiology