If the elderly sputum carries a large number of infectious viruses, then the elderly sputum disease transmission rate is higher. Whether young or old, sputum may carry infectious viruses, and the survival time of viruses after they leave the body is often closely related to environmental humidity and temperature. Most viruses carried in sputum begin to decline in activity around 2-6 hours after leaving the body, but this does not mean that they lose their infectiousness. Many infectious viruses that leave the human body with sputum may attach to the surface of environmental objects, causing an increase in the probability of environmental infection and object infection within a few days or even ten days, posing a threat to the health of those who have been in contact with the environment and objects. To summarize, spitting by the elderly may lead to viral transmission, so it is necessary to wear a mask when you go out, wash your hands with 75% medical alcohol when you go home, and disinfect your belongings. In addition, if you feel unwell after coming into contact with the environment where the elderly spit, it is recommended to go to the hospital in time for examination to determine whether there is a viral infection, and follow up the treatment under medical advice.