(2) Preventive measures for infectious diseases include: controlling the source of infection, cutting off the route of transmission and protecting susceptible people. Tuberculosis is a respiratory infectious disease, which is mainly spread by airborne droplets.
(3) The epidemic links of infectious diseases include: sources of infection, transmission routes and susceptible populations. Source of infection: a person or animal that can spread pathogens. Transmission route: The route through which pathogens leave the source of infection and reach healthy people is called transmission route, such as air transmission, food transmission and biological media transmission. Susceptible population: people who lack immunity to an infectious disease are called susceptible population. Therefore, compared with the girls next to them, tuberculosis patients are infected.
(4) Phlegm contains viruses and bacteria, which can spread diseases. Don't spit everywhere.
So the answer is: (1) A.
(2)C
(3)B
(4) There are a lot of germs in sputum.