1.one of the stages of infection when the signs and symtoms of disease appear?

2.it is a disease caused by germs that are spread from person to person through the air. it usually affects the lungs, but it can also effect other. parts of the body, such as the brain, the kidneys or the spine?

3 it is a contagious respiratory illness caused by infloenza viruses that infect the nose throat and something the lungs?

4. true or false
once vaccinated you can't get the disease again?

5. true or false
you can't spread a communicable disease if you one not sick?​