New coronavirus infection is transmitted mainly by respiratory transmission, i.e., respiratory droplet transmission and transmission after close contact with the virus. Some studies have found viral nucleic acids in the urine and stool of patients, and the virus has a gastrointestinal route of transmission, which is not very clear at this time. No clinical cases of blood transmission have been found, but if a patient has viremia during the infection, i.e., if the virus replicates in the body, blood donation can theoretically be transmitted to the patient receiving the blood source, so recently blood donation regulations have also been introduced, suggesting that people who donate blood with a history of epidemiological exposure should be observed for 14 days before donating blood, in order to prevent the possibility of blood transmission. Content source: Dr. You Lai