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| What are the transmission routes of infectious diseases? What is the way of communication? |
Sources of infection In humans, there are pathogens that grow and reproduce, and humans and animals that can be discharged from pathogens, that is, people and animals that are infected with infectious diseases or carry pathogens. Patients with infectious diseases are an important source of infection and have a large number of pathogens in their bodies. At various stages of the disease, the patient's source of infection has a different effect, which is mainly related to the number of diseases, the number of pathogens discharged, and the extent and frequency of contact between the patient and the surrounding population. For example, most patients with infectious diseases can discharge a large number of pathogens when they have clinical symptoms, which threaten the surrounding population and is an important source of infection. However, some patients, such as whooping cough, have more pathogens in the catarrhal period and are highly contagious. However, the number of pathogens discharged during the cough period is significantly reduced, and the infectivity is gradually reduced. Another example is that hepatitis B patients are contagious at the end of the incubation period.
